Tag Archives: prenatal diagnosis

1193 to 4

Prenatal diagnosis of Down syndrome has long presented an ethical dilemma for the genetic counseling profession. As genetic counselors are fond of saying , we strongly support women’s reproductive decisions, including both continuing and terminating pregnancies wherein a fetus has been diagnosed with Down syndrome or other condition. But also in the oath that genetic counselors swear to,* we claim to be strong supporters of the rights and dignity of people with disabilities. The disconnect between these ethical imperatives leaves genetic counselors open to justifiable criticism from people with disabilities, their families, and their advocates. How can we simultaneously support people with disabilities while at the same time participate in a screening program whose primary purpose is to sort out fetuses who have certain disabilities?

The typical response to this criticism is that patients have choices about whether or not to undergo prenatal screening for Down syndrome, and genetic counselors try to be value neutral in supporting patient choices (for the moment leaving aside the economic and social realities that limit women’s choices and that genetic counselors have no control over). One of the purported benefits of prenatal screening for Down syndrome is that it allows couples to prepare for the birth of a child who may have special needs. And as many of my patients’ obstetricians used to say to them, we can be better prepared medically for the baby’s birth. Seem like reasonable points, no?

Well, they do seem like reasonable counterpoints. But this got me thinking – just how much research has been done on the extent to which prenatal diagnosis enhances familial adaptation to a diagnosis of Down syndrome, and how much does it improve the medical and developmental picture for the newborn with Down syndrome? In short, I wanted to know how much benefit people with Down syndrome and their families gain from prenatal diagnosis.

To help answer this question, I performed a PubMed search using these broad terms: Down syndrome, prenatal diagnosis, prenatal screening. I set the parameters to English language articles with abstracts for the ten years prior to September 18, 2015. This produced 1373 articles, 176 of which I eliminated because they were not primarily about prenatal screening for Down syndrome, leaving 1197 articles. I then read the abstract of each article for evidence that the research addressed the benefit of prenatal screening to postnatal adaptation of families or improved medical outcomes for liveborn children with Down syndrome.

1193 articles addressed sensitivity, specificity, assessing test performance, comparison of screening techniques, patient anxiety, ethical critiques both pro and con, program implementation, patient education, economic/cost benefit analysis, circulating placental DNA, maternal serum biochemical analytes, ultrasound markers, psychological responses, termination rates, decision making, etc..

The number of articles that addressed my primary question? Four.

And even this number is a bit of a stretch. Two of the four articles were speculative pieces about how prenatal diagnosis may one day allow options for treatment. These two articles shared a primary author and one article was basically a slight update of the earlier article.

The other two articles reported on the experiences of women who received a prenatal versus a postnatal diagnosis of Down syndrome. One article reported that women had a difficult time with how the diagnosis was delivered whether it was prenatal or postnatal. The other article reported that a majority of women who received a prenatal diagnosis of Down syndrome and continued the pregnancy felt that they would undergo prenatal screening in future pregnancies for emotional preparation.

I recognize the shortcomings of my quick analysis. No doubt I missed a few articles. PubMed search results vary significantly with the search terms and parameters, and I swear sometimes with the phase of the moon (speaking of which, the upcoming eclipse of the Blood Moon/Harvest Moon September 27-28 should be spectacular, though it may affect PubMed searches that are conducted during the event). Abstracts may not accurately convey the research findings. And of course the search does not include articles published in languages other than English or that were published before September, 2005. So if you know of articles that I missed, please point them out in the Comments section below. Heck, do a PubMed search yourself and see what you come up with. Prove me wrong, please.

If we are going to honestly present prenatal screening as a choice, the choices have to be more than Abort or Carry To Term, unless of course we want to make the uncomfortable acknowledgement that the primary purpose of prenatal screening is to avoid the birth of children with Down syndrome. Pregnancy termination is important for many couples and we should support patients in their reproductive decisions whatever their motivations, but we also need to show a wider range of benefits from prenatal screening.

Ten years and not even a handful of published research about the benefits of prenatal screening for people who have the very condition that is being screened for. Come on, we can do better than this. Our patients deserve better. Shame on us.


* – Okay, I admit that I made up the oath part, but it is so ingrained into our core ethos when we are trained that it may as well be the genetic counseling equivalent of the Hippocratic oath.


Filed under Robert Resta

Ohio seeks to criminalize abortion based on a prenatal diagnosis of Down Syndrome. Can they do that? The answer may be more complicated than you think.

This fall, the Ohio State Legislature will vote on a bill that would make it illegal for a woman to get an abortion if she is terminating the pregnancy because her fetus has Down syndrome. If passed – and it is expected to pass – the bill must be signed by Governor John Kasich, who happens to be running for the Republican nomination for president. That should tell you everything you need to know about the chance of a veto.

Ohio is poised to join North Dakota as the second state to restrict abortion from being used to prevent the birth of a child based on a prenatal diagnosis. North Dakota’s law does not specify Down Syndrome, but makes it a crime to perform an abortion that is sought because of a “genetic anomaly.” You might think this restriction is unconstitutional under Roe v Wade — and you might be right about that – but as of today the North Dakota law remains on the books. Abortion rights advocates considered a challenge, but decided that the law was impossible to enforce, and therefore not worth the time and expense.

Beyond the Orwellian specter of a law that parses women’s motivation — and the perversity of allowing abortion only when a fetus is healthy – these laws demonstrate a deeper truth: anti-abortion activists have taken aim at prenatal diagnosis. Rick Santorum’s attack on amniocentesis in 2012 may have been badly articulated, but ideologically like-minded employers have embraced his call to cut off funds for prenatal testing. Genetic counselors may not feel that prenatal testing and abortion are two sides of the same coin, but it is important to understand that the rest of the world sees a clear and causative relationship between testing and termination.

Geneticists are not fortune tellers – a point we are forced to make frequently – and it is hard to predict what will happen in the courts BUT you have to assume these laws would not survive a legal challenge. If it stands it is hard to imagine a prosecution. How do you prove motivation?

Does that mean it doesn’t matter? A recent Bioethics Forum post noted that It seems odd to allow prenatal testing for Down syndrome – which the American College of Obstetricians and Gynecologists has recommended should be offered to all pregnant women – and then deny women the opportunity to decide what to do with the information.” This was meant as a criticism of the law, but there’s amore chilling implication. If you want to prevent abortions based on prenatal diagnosis, you can restrict the right to abortion OR you can restrict the right to prenatal diagnosis. One of these things is unconstitutional. What about the other?

There are objections you could raise. Free speech! Yes, but telling your patient about prenatal diagnosis isn’t going to help if her health plan refuses to pay for it. The sacred doctor-patient relationship! Yes, but remember that many states already have laws requiring doctors to read from a script to any woman seeking termination. In some states women seeking abortion are told, by law, that abortions are associated with breast cancer. Are you surprised to hear about this alarming association? That’s because it isn’t true.

If you believe that a fetus is exactly the same thing as a baby – and despite widespread uneasiness with abortion most people do not – then prenatal diagnosis is offensive. One typical and less confrontational approach to this attack is to talk about the value of prenatal diagnosis apart from termination. This feels like safer ground, but I would argue that it is short-sighted. Even if prenatal therapies improve, and there are some promising things in the works, testing will remain a vehicle for giving couples the option of termination, and when we deny that fact we look cagey and defensive. We open ourselves to the same charges of hypocrisy that we throw at anti-abortion advocates who cloak themselves in the language of the women’s rights movements. “We are just empowering women,” they say of mandated anti-abortion scripts. No, you are not. “We are fighting for women’s health,” they say, of regulations that put abortion providers out of business. No, you are not.

We need to be prepared to make the argument for what we do. Carefully and sensitively, but transparently, and without shame. We help families have healthy children and that’s a good thing and not a bad thing. We help people make the choices that are right for them. People in this field know that restrictions on prenatal diagnosis are not empowering. We know who they will end up hurting – the poor the young, the vulnerable – all the usual suspects. Prenatal diagnosis is not going away anytime soon. But keeping it available to everyone is going to take work and vigilance.

Follow me on twitter!



Filed under Laura Hercher

Guest Post: Sometimes It’s Okay To Fail

by Lisa Demers and Stephanie Snow

Stephanie Snow, MS, CGC has 11 years of prenatal genetic counseling experience. She worked as a clinical site coordinator and genetic counselor for the FASTER study and as a clinical research coordinator for the NEXT study. Lisa Demers, MS, LGC has 12 years of prenatal genetic counseling experience and currently works with Ariosa Diagnostics as a Medical Science Liaison.

The landscape of prenatal screening is changing. The use of non-invasive prenatal testing (NIPT) in clinical practice is already common and is being adopted quickly by generalist obstetricians and maternal fetal medicine specialists. While the cell-free DNA technology is innovative and the impact on patient care is significant, there is a rising chatter about NIPT failures – the 1-8% (depending on the company) of reports that return without a test result. This is a dual issue – there’s the underlying “annoyance” that NIPT occasionally fails to produce a result, and then there are publications suggesting an association between fetal aneuploidy and test failure. The latter is a conversation for another day.

Although these “no call” results frustrate patients and their doctors, the negativity surrounding these failures is surprising. The concept of a test failing is not new in medicine, and certainly not within prenatal medicine. Increasing rates of maternal obesity are just one reason for limited prenatal surveillance, with one study demonstrating that 41% or less of fetal survey ultrasounds on patients with a BMI of 30 or higher were able to be completed on the first try. When it comes to first trimester measurement of nuchal translucency (NT), the FASTER trial noted an overall 7.5% failure rate, either because of an inability to measure or due to inaccurate measurement. In a review of patients within one clinic, where nearly 50% of patients had a BMI over 25 and 25% had a BMI of 30 or more, 4% of patients had an NT failure on the first attempt and of those who opted for a second attempt, 18% failed. Overall in this population, 2.7% of patients did not achieve a NT measurement.

This is not to say that test failures are necessarily bad. When an NIPT test fails, it is often because quality metrics are in place to ensure proper test performance – just as there are standards for NT measurement which are established by the Fetal Medicine Foundation (FMF) and the Nuchal Translucency Quality Review (NTQR) program. An NT may “fail” because a patient presents for screening outside of the appropriate gestational age requirements or because of suboptimal fetal positioning. The nuchal translucency measurement is critical in obtaining aneuploidy risk assessment when combined with serum biochemistry, and even the slightest over or under estimation dramatically impacts clinical care. Such is the case with NIPT quality metrics. These metrics are in place to ensure appropriate risk assessment for the pregnancy, with the most important of these being fetal fraction. Fetal fraction is greatly affected by maternal weight, with obese women less likely having the required minimum concentration of fetal DNA in circulation. Here again, maternal obesity reduces our ability to accurately assess the well-being of a fetus.

In reality, any test failure rate can be a nuisance to a busy clinic. Having patients return for an additional visit is inconvenient to patient and provider alike. However, there are biological and technical reasons for at least some NIPT tests to fail. The thoughtful provider will consider the various metrics involved with the NIPT options and select one that balances high quality metrics (including fetal fraction) and low rate of technical failures.


Filed under Guest Blogger

Guest Post: PPV Puffery? Sizing Up NIPT Statistics

by Katie Stoll and Heidi Lindh

Heidi and Katie are genetic counselors and both work with the newly established charitable nonprofit, the Genetic Support Foundation (twitter @GeneticSupport), geneticsupportfoundation.org.

The importance of the Positive Predictive value (PPV) in interpreting Noninvasive Prenatal Testing (NIPT) results is increasingly on the minds of providers as evidenced by frequent discussions, presentations, and publications on the topic. But what if, in an effort to make their lab look like the best lab, the NIPT PPV was overstated in marketing materials or even on test reports? And what if providers and patients believed this information without question or further investigation?

Until 2014, four labs (Sequenom, Verinata Health/Illumina, Ariosa and Natera) were the only companies in the United States that offered NIPT. Over the past year, we have seen a burgeoning of new labs offering their own branded NIPT tests. In some cases, the 4 original companies act as “pass-through” labs in which the testing is branded and advertised through a secondary lab however the sample is ultimately sent to the primary lab for analysis and interpretation. In other cases, referral labs have brought NIPT testing in-house, developing their own algorithms and reporting, such as the case for the InformaSeqTM test offered by LabCorp and Integrated Genetics. In a recently published marketing document, Illumina lists 16 laboratory “partners” that all offer a version of the Illumina NIPT. The other primary NIPT labs are also distributing their tests through other labs as well; Quest Diagnostics and the Mayo Clinic have been secondary labs for the Sequenom NIPT (Quest also has their own brand, the “Q-Natal Advanced”and Natera’s NIPT is available through GenPath and ARUP).

The growing number of laboratories that offer some version of NIPT presents a significant challenge for healthcare providers who are struggling to navigate the various testing options to determine what is in the best interest of their patients. The competitive commercial landscape and aggressive marketing of NIPT to both patients and providers can further confound clinical decision-making given the paucity of information available to providers that is not delivered with an angle aimed at selling the test.

NIPT Statistics in Marketing Materials

We have noted that multiple labs offering testing have promoted extraordinarily high positive predictive values (PPVs) in their marketing materials distributed over the past year and on their websites ^ and on laboratory test reports. These tables include information regarding PPV frequently reference data from the Illumina platform and VerifiTM methodology and a study by Futch et al. as the source.


Performance Data Presented in Marketing Brochures for NIPT
Condition PPV NPV Sensitivity Specificity
T21 0.994 0.999 >99.9% 99.8%
T18 0.910 0.999 97.4% 99.6%
T13 0.843 0.999 87.5% >99.9%

These figures (or slight variations thereof) have been observed in the marketing materials for multiple laboratories offering NIPT. These specific statistics were reproduced from an InformaSeq brochure and sample test reports available online


The PPVs reported in this table – being widely distributed on test reports and as educational information for providers – have NOT been demonstrated by the referenced study by Futch et al. or any published NIPT studies of which we are aware.

Of course, the PPV of a screening test depends on the prevalence of the condition in the population being screened. Using the sensitivity and specificity of testing accompanying these predictive value data in the same brochure, one could only derive PPV of >99% if the prevalence of Down syndrome in the screened population was 25% or 1 in 4 pregnancies, far higher than the a priori risk for the vast majority of women undergoing prenatal screening.

PPV = (sensitivity x prevalence) / ((sensitivity x prevalence) + (1 – specificity)(1 – prevalence))

.994 = (.999x.25)/((.999x.25) + (1-.998)(1-.25)

In contrast, if we utilize performance statistics provided by the laboratories, we calculate a PPV of 33% in a population with a prevalence of 1 in 1,000 (which is similar to the prevalence for women in their 20’s) and a PPV of 83% in a population with a prevalence of 1 in 100 (which is similar to the prevalence in women age 40).

The Futch Factor

The study by Futch and colleagues that is frequently cited in marketing materials for NIPT does not demonstrate the high PPVs that are referenced, although we suspect that these statistics were arrived at through a series of assumptions about the Futch data that we will attempt to outline.

This study reported that in a cohort of 5,974 pregnant women tested, there were 155 positive calls for T21, 66 positive calls for trisomy 18, and 19 positive calls for trisomy 13. In this published report, only a fraction of the positive NIPT results had confirmation of the fetal karyotype, 52/155 cases of Down syndrome (33.5%); 13/66 cases of trisomy 18 (19.7%); and 7/19 cases of trisomy 13 (53.8%). There was 1 case of Trisomy 21 that had a normal NIPT result (false negative result), however negative test results were not methodically followed-up, so the true false negative rate for the screened conditions is unknown.

In analyzing the data presented by Futch et al, for marketing materials to derive PPVs of >99% for Down syndrome, 91% for trisomy 18 and 84% for trisomy 13 would require that all of the positive calls WITHOUT follow-up by karyotype confirmation were true positives.


Outcomes data from Futch et al, 2013 and projected PPVs based on category inclusion or exclusion as true positive.
T21 T18 T13
NIPT Positive 155 66 19
Confirmed (karyotype or birth outcome) 52 13 7
Discordant (Unexplained NIPT results that do not match karyotype from a source or birth outcome) 1 6 3
No information (laboratory did not obtain any information on outcomes) 22 12 0
Pregnancy loss (miscarriage , demise or termination without karyotype) 7 5 2
Unconfirmed (no karyotype or birth outcome known but history of clinical findings suspicious of aneuploidy such as ultrasound findings or high-risk biochemical screening results ) 73 30 7
Total Positive NIPTs where follow-up karyotype not confirmed 102 47 9
High End PPV* 99.4 90.1 84.2
Low end PPV** 33.5 19.7 36.8

*High end PPV- It appears that marketing material PPVs are considering all categories, including confirmed, no information, pregnancy loss, and unconfirmed to be TRUE positives in determination of PPVs.

**Low end PPV- calculated considering all cases, which were not discordant to be false positive results. A minority of positive NIPT results were confirmed with birth outcome or fetal karyotype information.


Given that Futch et al. did not have confirmed fetal karyotype or birth outcome follow-up for the majority of positive calls, it seems at best unlikely, and at worst impossible, that all of these positive NIPT results were correctly called, rendering claims of such high PPVs in the marketing materials based on this assumption to be unfounded. On the other end of the spectrum, if the PPV was calculated to include the not-karyotyped/no-birth outcome information pregnancies as false positive, the assumed PPVs would be 33.5% for Down syndrome, 19.7% for trisomy 18 and 36.8% for trisomy 13. Since the study does not report follow-up karyotype for the majority of positive test results, the true PPV for these NIPTs test likely lies somewhere in-between the high end PPV and low end PPV, perhaps closer to the 40-45% (for T18 and T21) previously reported in another Illumina sponsored study.

While the PPV of NIPT for Down syndrome, trisomy 18 and trisomy 13 exceeds that of traditional biochemical screening, no studies have demonstrated test performance as high as those presented in many of the PPV/NPV tables that are being provided to healthcare providers in marketing materials and, in some cases, on test reports.

A Call For Truth In Advertising And In Test Reporting

Honest communication about test performance metrics must be available to providers so that they can provide accurate counseling to patients making critical decisions about their pregnancies. While most labs do state that NIPTs are screening tests and that confirmatory testing of positive results is recommended, it is not surprising that providers and patients are having difficulty appreciating the possibility of false positive results when the laboratories are incorrectly reporting positive predictive values that exceed 99%. The consequences of relying on lab-developed materials rather than a careful analysis of the available literature are significant. There are reports of patients terminating pregnancies based on NIPT results alone. It is not surprising that some women choose not to pursue diagnostic testing to confirm abnormal NIPT results given the very high stated predictive value.

It is imperative that we recognize not only the potential benefits of these new technologies but also their risks and limitations. Testing companies are primarily responsible to their shareholders and investors, so information provided by companies about their products is largely aimed at increasing test uptake. Professional societies need to call for independent data and federal funds need to be made available to support independent research related to NIPT. Policies and best practices cannot arise from the industry-influenced studies that are currently available. While some regulatory oversight of marketing materials will likely be necessary, we urge the laboratories to consider their marketing approach and how it is affecting patients and providers. If laboratories want to truly partner with patients and providers, they need to provide accurate and straight-forward information to limit provider liability and likewise, help patients avoid making life-changing decisions based on inaccurate and/or confusing information related to test performance. As a medical profession can we come together and make this change without regulatory oversight? Now that would be a medical breakthrough.

^ – Notably, Counsyl has also recently produced a table that provides more accurate estimates of their NIPT predictive values



Filed under Guest Blogger

Guest Post: NIPS: Microdeletions, Macro Questions

by Katie Stoll

Katie Stoll is a genetic counselor in Washington State. She graduated from the Brandeis University training program in 2003 and since that time has held positions in the areas of prenatal, pediatric and cancer genetics. 


At the recent National Society of Genetic Counselors Annual Education Conference in New Orleans, a presentation raised some important questions about noninvasive prenatal screening (NIPS). According to the speaker, a woman with a vanishing twin pregnancy underwent NIPS with an expanded microdeletion panel and the results showed findings “suggestive” of a chromosomal microdeletion syndrome.

The patient underwent amniocentesis with a SNP microarray and the results were normal. In a follow-up call with the NIPS lab, the genetic counselor learned that multiple copy number variants were observed (not originally reported) in the original sample. The lab suggested that these variants could be associated with a malignancy or fibroid tumor (and were of course unlikely to be associated with a microdeletion syndrome in the fetus).

As a result of this genetic counselor’s follow-up phone call and due diligence, the patient underwent an extensive work up for possible cancer, but no explanation was found. NIPS was repeated and this follow-up study was normal.

My first thought in hearing this case was – That poor woman! First a lost twin pregnancy, then concern for a severe condition in her baby, anxiety about the amnio, and worry that she may have Cancer. Although I am not a health economist, my second thought was – Holy Cow! How can our healthcare system afford all of the follow-up testing that may come downstream from these tests? NIPS is promoted as a test that will lessen the need for follow-up procedures such as amniocentesis, but will that remain true as the list of screened conditions increases?

In October 2013 Sequenom expanded their NIPS test to include screening for microdeletion syndromes and Natera followed suit in Spring 2014. Some new companies entering the NIPS market are also advertising screening for microdeletion syndromes.

The addition of microdeletions is a brilliant business strategy for expanding the testing market to include all pregnant women. Even though microdeletions are rare, their incidence—unlike that of Down syndrome –is not linked to maternal age. Women who are currently not offered NIPS because they are not included in the high-risk categories proposed by the American College of Obstetricians and Gynecologists (ACOG) guidelines could now be given a reason to undergo NIPS—even though the predictive ability of the NIPS for rare conditions is less than impressive.

Women who elect the test because of an interest in Down syndrome or because they are eager to learn fetal gender may unknowingly be screened for rare microdeletion syndromes which they know little to nothing about. To add to the complexity, a maternal microdeletion condition may be an incidental finding. In a poster presented at the NSGC meeting this year, Sequenom presented a series of 22q11 deletions detected with their MaterniT21 PLUS test. Included in this report were two mothers who were themselves incidentally diagnosed with 22q11 deletion syndrome. Based on the consent form on the Sequenom website it seems unlikely that these women had any idea such a result may occur.

Where is the evidence to support this expanded screening?

These tests are being performed despite there being no published clinical validation studies. There have been some case reports and proof of concept studies; however given that this testing has been commercially available for over a year now, there is shockingly little published about cell free DNA screening for microdeletions. An abstract from a poster presentation at the ACOG annual meeting in April 2014 evaluated 6 samples (or is it 7? – it is not clear from the abstract) from pregnancies known to be affected with microdeletions and 8 simulated samples. They conclude, “This is the most comprehensive, accurate validation of noninvasive microdeletion detection hitherto… This approach will enable accurate, noninvasive, prenatal population screening for these severe disorders.”

Proof of concept is one thing; proof of clinical validity is another. If we value evidence-based medicine, a sample of six (or seven) affected pregnancies is a long way from being a basis for population screening. Whether population-wide screening for extremely rare disorders is worth paying for is, of course, a question in itself.

But in the unregulated environment of laboratory-developed tests, we adopt first and report out results later. Accompanying this process is a lack of transparency – labs performing NIPS with microdeletions have not made performance statistics publicly available and thus patients and providers have no way of determining the accuracy of microdeletion NIPS. In a webinar hosted by Sequenom , the presenters were asked about the positive predictive value (PPV) of Sequenom’s screen for microdeletions. One speaker replied, “We have calculated them. However, what we would like is essentially to wait a little bit to give you more clinically relevant results. Because so much depends on the fetal fraction of the sample and so on and so forth, so we feel that the more appropriate number to release is after we have done 50,000 samples, how many have we found, how many have we reported back, how many were confirmed, how many were in line with the clinical picture.”

Shouldn’t the accuracy of the test be publicly known before it is run clinically on 50,000 women?

Labs have given us only a glimpse of their performance statistics. I was previously provided information from Natera regarding estimated PPVs for the microdeletions on their panel, but I cannot locate this information anywhere in the public forum. The table I was provided stated a 1/19 PPV (5.3%) for 22q11 with a Fetal Fraction >6% and dropping much lower (to 1/45) with decreased fetal fraction (interesting thread here of multiple women with a 1/19 chance of 22q11 on their NIPS result).

In a letter to the editor, former CMO of Sequenom Allan Bombard and colleagues reported that they had evaluated 264 samples from pregnancies with known microdeletion and microduplications or “enriched genomic mixtures” and report a 100% sensitivity and 99.3% specificity. Applying these statistics to 22q11.2 deletion syndrome (the most common microdeletion syndrome on the panel with an incidence of 1 in 4,000) indicates a PPV of about 0.036 or 3.6% . The overall PPV would be expected to be lower given the very low incidence of the other microdeletions on the panel. At the NSGC meeting this year, Sequenom presented some preliminary data from a series of 120,726 samples screened from October 2013 – July 2014 with test performance that exceeds those estimates. Although they did not have complete follow-up data for positive and negative results, a press release from the company following the NSGC meeting reports “high positive predictive values (estimated combined PPV ranged from 62% to 94%)”.

The limited information available suggests PPVs for microdeletion syndromes fall within a broad range of <3% – >90%. Published peer-reviewed studies are needed to help clarify the PPV associated with this testing so that healthcare providers and patients can make informed decisions about utilizing and interpreting this testing.

About a year and a half ago I published a piece on the DNA Exchange that discussed the importance of PPV in interpreting NIPS results. This was written for an audience of genetic counselors, but the posting is being increasingly used as a venue for patients to share their stories and seek information about their test results. Many patients report considerable anxiety – “the waiting is killing us…we have been devastated for the better part of 3 weeks now” – and some express regret for undergoing this testing at all, “I too wish I would of just done the typical old fashion test so nothing was in the back of my mind and hours of my life would be given back…” Recently, a woman remarked that she did not consent to additional testing for microdeletions and indicates her frustration with not being able to find information about the PPV for this test, “Not only are they essentially experimenting on us…they are not transparent about the potential problems with validity or low PPV.”

As genetic counselors, we are implicated in these companies’ approach. We should be demanding better evidence before leading our patients towards testing that could create this kind of distress. We need to be asking good questions, and we should demand good answers. If we cannot figure out how reliable a screening test is from a thorough review of the literature, I think we really need to ask ourselves if we should be offering it in a clinical setting.


Filed under Guest Blogger

A Mixed Verdict

A recent $50 million dollar jury verdict in a “wrongful birth” lawsuit in the Seattle area* has caught the attention of genetic counselors, hospitals, patient advocates, and legal experts. The ruling in this case may have both positive and negative implications for the genetic counseling profession. Let me be clear up front – I am not passing judgement on the verdict, the medical providers, the parents, the quality of care, or the laboratory. This case is very complicated and no doubt many details were not publicly reported. Although I know some of the parties involved, I was not directly connected to the case and I have no insider knowledge. Indeed, I did not know about the case until it hit the news.

In 2007 a woman underwent chorionic villus sampling (CVS) because her husband was a known carrier of a very subtle 2;9 translocation. The institution where the procedure had been performed had no genetic counselor working on the day the CVS was performed, contrary to departmental guidelines for complex cases. Somehow the details of the translocation were not clearly communicated to the cytogenetics laboratory. The fetus had an unbalanced translocation that was erroneously reported out as a normal karyotype. The couple continued the pregnancy to term and the misdiagnosis was detected after the child was born. In 2010 the couple sued the hospital, the laboratory, and the physician who performed the CVS. The physician and the plaintiffs entered into a “High/Low” agreement  in which the defendant agrees to pay a minimum recovery in return for the plaintiff’s agreement to accept a maximum amount regardless of the outcome of the trial. The medical center and the laboratory  were held equally responsible for the $50 million payout, with half the money going to a Guardian ad Litem for the child to pay for his medical care and other expenses and half going to the parents.

The core argument of the plaintiff’s lawyer was that the error would likely have been prevented if a genetic counselor had overseen the patient’s prenatal testing to assure that the critical information about the translocation was clearly communicated to the laboratory. The medical center had reduced the genetic counseling staff despite pleas from the maternal fetal medicine specialists and in the face of growing patient volumes and increasing net revenue. Lawyers for the plaintiff further claimed that the medical center and laboratory did not follow Error Prevention and Quality Management Policies and that the misdiagnosis was the result of a systemic failure. These arguments were important to the extraordinarily large size of the award; the missed diagnosis was attributed to “true negligence” rather than a one-time human error.

The outcome of this case can be beneficial in several ways for the genetic counseling profession. The jury acknowledged the critical role that genetic counselors serve in the delivery of medical care. For genetic counselors trying to justify their positions and salaries can now also argue that their institution’s legal vulnerability can be dramatically reduced by having an adequately staffed genetic counseling service. After all, genetic counselors’ salaries are a pittance in the overall hospital budget and pale in the face of multi-million dollar legal damages. Genetic counselors served as expert witnesses for both the plaintiffs and the defendants, further enhancing the profession’s status.

On the other hand, the verdict did little to improve the rocky and complicated relationship between genetic counselors and people with disabilities, their families, and their advocates. From the perspective of many in this group, prenatal diagnosis and selective termination are bright shining examples of society’s intolerance of people with disabilities. Because genetic counselors are integral to the delivery of prenatal diagnosis services, we are criticized for being part of a larger social and systemic bias.

Genetic counselors counter that they do not direct patient’s decisions, only support them. Genetic counselors are all too familiar with the gut-wrenching, emotionally draining process that patients go through when they decide to terminate or continue a pregnancy in which the fetus has a chromosomal imbalance. And in many situations, genetic counselors serve as advocates for people with disabilities and their families. But this defense does not hold water with those who argue that the very existence of prenatal screening is an insult to people with disabilities who, after all, do not see much in direct benefit from NIPS, amniocentesis, CVS, etc. What positive message can someone with disabilities find when half of the fifty million dollar award was for pain and suffering of the parents, and the very justification of the life of someone with disabilities is called into question when he or she is labeled “a wrongful birth?”

For now, we live in a society where women have the hard-earned right to terminate a pregnancy for whatever reason they choose (although the ability to act on that right can be severely hampered by socio-economic status and governmental policies). Genetic counselors line up behind the defense that they nondirectively help women to act on this reproductive freedom. Disability advocates are often avid supporters of reproductive rights too but do not feel that prenatal testing is necessary to the expression of reproductive freedom and point out that society’s negative view of disabilities and unwillingness to allocate appropriate resources further worsens the effects of disabilities. The two sides seem to be at an impasse and the fact that genetic counselors might applaud this court’s decision may only further contribute to this impasse.

We cannot ignore the voice of our critics.  I am not sure what the solution is. Prenatal diagnosis is unlikely to go away unless abortion becomes illegal again. If genetic counselors suddenly decided to pull out of prenatal diagnosis services, I suspect that informed patient decision-making would deteriorate and people with disabilities would lose one of their few potential advocates in the prenatal system.

As a profession and as individuals we need to reach out to our critics and find some common ground, such as the recently developed Open Lines forum where disability scholars, genetic counselors, parents, and people with disabilities can openly and safely discuss their perspectives. Surely the two sides are not as dysfunctional as the US Congress. It will be painful and difficult, but great achievements often require great suffering.

* – King County (Washington) Superior Court Case # 10-2-43289-2, Judgment Record # 13-9-35173-6 & 13-9-33521-8

Note: Some of the information in this posting is based on an article written by the plaintiffs’ lawyer (Gardner T, “Significant verdict in wrongful birth suit” Trial News, January 2014, pp. 9-11).


Filed under Robert Resta

Guest Post: Adrienne Asch – Reflections from a Genetic Counselor

by Katie Stoll

Katie Stoll is a genetic counselor in Washington State. She graduated from the Brandeis University training program in 2003 and since that time has held positions in the areas of prenatal, pediatric and cancer genetic counseling.

We recently said good-bye to Adrienne Asch, a thoughtful and powerful voice in bioethics, disability, and reproductive rights. Adrienne passed away at her home in New York on November 19, 2013, surrounded by the love of many friends and family.

Adrienne touched my life deeply in the brief time I knew her and I am grateful to have had a connection with her. Her perspective has significantly shaped the way I view the genetic counseling profession and my role within it.

Adrienne was an accomplished scholar and an incredible person. Several beautiful tributes speak of character and her accomplishments, and these only give us a glimpse of her impressive body of work. See the The New York Times, as well as blogs related to philosophy, feminism, and bioethics for more about Adrienne.

Many genetic counselors are aware of Adrienne’s focus on the intersection of disability rights with reproductive technologies.   She was supportive of abortion rights, but questioned the implications of prenatal diagnosis and selection for disability rights, for individual parent expectations, and for humanity. She asked the question, if individuals with disabilities are not welcomed into family life, how can we expect inclusion in schools, in the work place, in society?

In her scholarly work, Adrienne spoke frequently about the parent-child relationship, and I had often wondered about her personal experiences as a child in this relationship. I came across the transcript of a fantastic interview with Adrienne conducted by Anna Kirkland at the University of Michigan, in 2006. I was delighted to find these insights into Adrienne’s own family life and it is heartening to realize that Adrienne’s views on this topic were in part shaped by her own childhood experiences of being supported to be true to herself:

“My parents taught me to think for myself and to be comfortable with who I was, even if people around me weren’t entirely comfortable with who I was either as a leftwing type or somebody who loved classical music, or someone who was Jewish, or someone who was blind. So they just taught me to be myself.” 

At one point the interviewer asking Adrienne if she had ever had the opportunity to address genetic counseling students. Adrienne has been an outspoken critic of prenatal diagnosis and this has made her quite a controversial figure among genetic counselors.

Anna: I’d be interested to know, have you ever had the opportunity to address a group of genetic counseling students or…or… 

Adrienne:  Yes. I have. 

Anna: Yeah. How did that go? 

Adrienne:  Not well. 

Anna: [laughs] What [laughs]…what did you say to them? 

Adrienne:  The same kind of thing I’m saying to you. But it challenges…I mean, maybe that I haven’t said it gently and kindly enough and I’m trying to do that. I have sympathy for how difficult it is to do this work. But I have no sympathy for people telling me that parents aren’t interested in this information or it’s not appropriate to give them the kinds of information that I’m describing. I think in fact that’s what genuine information is.

Recently, I had a chance to work closely with Adrienne when she helped to conceptualize a symposium for the National Society of Genetic Counselors Annual Education Conference, Reaching for Common Ground: Prenatal Genetic Counseling and Disability Equality. Although  Adrienne’s health prevented her from traveling to Los Angeles for the meeting, she was determined to hear all of the presentations live and to participate in the conversation. We achieved this through the technological miracles of cell phones, speakers and microphones for the entire 6 hour conference and this allowed her to both listen and contribute to the conversation.

In early October, she recorded a video for this conference and the National Society of Genetic Counselors has kindly allowed me to share it here. I encourage you all to take the time to listen to Adrienne’s final address to genetic counselors. I think she finds the balance she was striving for in being sympathetic to the difficulties inherent in the work of genetic counseling and remaining strong in her challenge to our profession to be more than genetic educators.

In genetic counseling, you have an enormously important role to play in helping prospective parents’ to think about the meaning for themselves of the genetic impairments or prenatally diagnosable impairments that they might discover in a fetus or an embryo.   And the role that you have to play is not genetics education alone.  It is genuine counseling.  It is counseling with a genetic component.  But it is dialogic counseling.  It is not merely reciting facts about laws and services and family support for people with Down syndrome.  It’s not reciting how wonderful it is and how loving the children are…It’s not reciting how terrible it is and how bad group homes might be.  It’s asking parents to think about the goals they have for their family life and how a child with characteristics that they can know in advanced will affect the achievement of those goals… The other reason you have a big job is that you are not given much time in which to do it. And all of the institutional forces work against that kind of conversation.  But I am urging that genetic counselors take their respective places as counselors to really help prospective parents think through what they want for their family life.  How a particular characteristic or impairment will affect that…

…Just as life is made up of many experiences that are shareable, you don’t need to have particular characteristics in common to share a life and to share experiences.  And you as a genetic counselor have an opportunity to communicate that to prospective parents. And ask prospective parents to think about what they want in their family’s lives.  And whether a child with a particular characteristic you can name in advanced will make the achievement of those goals any harder or any less possible. 

That’s a job of real counseling.  It’s not a job of imposing your values.  It can be as nondirective as you like but it is a job of asking questions maybe questions parents don’t want to be asked but that’s often true of any counseling.  No therapist worth his or her salt merely smiles and nods and says, “Ahah!”, and says, “I see what you mean”.  Therapy and counseling are about asking people to reflect and think twice or three times about the views and the values they are bringing to their lives.  You don’t have three years or 3 months or sometimes even 3 weeks to do that with the people in front of you.  But in the 45 minutes to an hour that you have, or if you’re lucky, more than that, you have a chance to communicate the joys of parenthood, the problems of parenthood, and the ways in which a child with any set of characteristics may or may not fulfill the goals that a parent has.”

Part of our fundamental core professional values as genetic counselors is to be non-directive in our counseling – not to decide the morally ‘right’ path for pour patients. We strive to support individuals to choose the path that they decide is right for them. Our responsibility as genetic counselors is to do our best to make certain that the decisions people make are as informed as possible.

What Adrienne helped to crystallize for me is that part of ensuring informed decisions requires inquiry into of the prospective parent’s expectations, hopes and dreams. It may also call for us to challenge misconceptions about how life with a disability is imagined and this may need to begin first with examining our own misconceptions and biases.

Adrienne certainly dismantled my preconceptions about life and limitations for someone who has been blind since shortly after birth. Although too short, her life was undeniably rich and full and her contributions were many. I imagine there are many DNA Exchange readers who have some interesting reflections about Adrienne of their own. I hope you will share them here.


Filed under Guest Blogger