Prenatal Screening Negligence: NIPT and Genetic Testing Errors in NY

Types of Prenatal Genetic Screening

Prenatal genetic screening falls into two categories: screening tests (which assess risk but are not diagnostic) and diagnostic tests (which provide definitive answers). Understanding the distinction is critical for both medical care and legal evaluation.

• Non-Invasive Prenatal Testing (NIPT): Also called cell-free DNA (cfDNA) testing. Screens for common chromosomal abnormalities (Trisomy 21, 18, 13) and sex chromosome abnormalities. Performed from 10 weeks of pregnancy. High sensitivity (>99% for Down syndrome) and very low false-positive rate.
• First Trimester Screen: Combines maternal blood test (PAPP-A and free beta-hCG) with nuchal translucency ultrasound (measuring fluid at the back of the fetal neck). Performed between 11-14 weeks. Screens for Trisomy 21 and 18.
• Second Trimester Quad Screen: Maternal blood test measuring AFP, hCG, estriol, and inhibin-A. Performed between 15-22 weeks. Screens for Trisomy 21, 18, and neural tube defects.
• Integrated/Sequential Screening: Combines first and second trimester screens for improved detection rates.
• Carrier Screening: Blood test to determine if parents are carriers of recessive genetic conditions (cystic fibrosis, sickle cell, Tay-Sachs, spinal muscular atrophy, etc.). Should be offered to all pregnant women and preferably before pregnancy.
• Detailed Anatomy Ultrasound: Performed at 18-22 weeks to evaluate fetal anatomy for structural abnormalities.

Non-Invasive Prenatal Testing (NIPT)

Non-Invasive Prenatal Testing (NIPT) — also called cell-free DNA (cfDNA) testing — is a revolutionary screening method that analyzes fragments of fetal DNA circulating in the maternal bloodstream. NIPT can be performed from approximately 10 weeks of pregnancy and has transformed prenatal screening.

NIPT screens for: - Trisomy 21 (Down syndrome): Sensitivity >99%, false-positive rate <0.1% - Trisomy 18 (Edwards syndrome): Sensitivity >98% - Trisomy 13 (Patau syndrome): Sensitivity >99% - Sex chromosome abnormalities: Turner syndrome (45,X), Klinefelter syndrome (47,XXY), Triple X (47,XXX), 47,XYY - Microdeletions: DiGeorge syndrome (22q11.2 deletion), Cri-du-chat (5p-), Prader-Willi/Angelman (15q11-q13), and others (depending on the specific panel)

ACOG recommends that all pregnant women be offered NIPT, regardless of age or risk factors. This is a significant change from the previous standard, which reserved NIPT for high-risk pregnancies.

Important: NIPT is a screening test, not a diagnostic test. A positive (high-risk) NIPT result must be confirmed with a diagnostic test (CVS or amniocentesis) before any irreversible decisions are made. A negative NIPT result does not guarantee a healthy baby — it only reduces the likelihood of the screened conditions.

Common NIPT errors that constitute negligence include: - Failure to offer NIPT to a pregnant patient (especially now that ACOG recommends universal offering) - Failure to communicate a positive NIPT result to the patient - Failure to recommend confirmatory diagnostic testing after a positive NIPT - Failure to perform the confirmatory test within the appropriate gestational age window - Mislabeling or laboratory errors in processing the NIPT sample

Traditional Serum Screening (First and Second Trimester)

Before NIPT became widely available, traditional serum screening was the standard. While NIPT has largely supplanted these tests, they are still performed and remain important:

First Trimester Screen (11-14 weeks): - Maternal blood: PAPP-A (pregnancy-associated plasma protein A) and free beta-hCG - Ultrasound: Nuchal translucency (NT) measurement — fluid at the back of the fetal neck - Detection rate for Down syndrome: approximately 82-87% with a 5% false-positive rate

Second Trimester Quad Screen (15-22 weeks): - Maternal blood: AFP (alpha-fetoprotein), hCG, estriol, inhibin-A - Detection rate for Down syndrome: approximately 81% with a 5% false-positive rate - AFP alone screens for neural tube defects (spina bifida, anencephaly)

Integrated Screen: Combines first and second trimester results for the highest detection rate (approximately 94-96% for Down syndrome) with a 5% false-positive rate.

Negligence in traditional screening includes: - Failure to offer screening at all - Failure to perform the NT ultrasound at the correct gestational age (11-14 weeks) - Failure to communicate abnormal results - Failure to follow up abnormal serum screening with diagnostic testing - Failure to offer NIPT as a more sensitive alternative when traditional screening is abnormal

Diagnostic Testing: CVS and Amniocentesis

When screening tests indicate an increased risk, diagnostic testing provides a definitive answer. The two primary diagnostic procedures are:

Chorionic Villus Sampling (CVS): - Performed between 10-13 weeks of pregnancy - Involves taking a sample of placental tissue (chorionic villi) through the cervix or abdomen - Provides a karyotype (chromosomal analysis) and can detect most chromosomal abnormalities - Cannot detect neural tube defects (requires amniocentesis) - Procedure-related miscarriage risk: approximately 0.5-1%

Amniocentesis: - Performed after 15 weeks of pregnancy - Involves taking a sample of amniotic fluid through the abdomen - Provides karyotype and can detect neural tube defects (via AFP and acetylcholinesterase levels) - Can also test for specific genetic conditions using DNA analysis - Procedure-related miscarriage risk: approximately 0.1-0.3%

The standard of care requires that patients with abnormal screening results be offered diagnostic testing (CVS or amniocentesis) and counseled about the risks, benefits, and limitations of each procedure. Failure to offer diagnostic testing when screening is abnormal, failure to perform the procedure within the appropriate gestational age window, or procedure-related errors (e.g., injury to the fetus or infection) may all constitute negligence.

Ultrasound Screening for Structural Anomalies

The detailed anatomy ultrasound, performed at 18-22 weeks of gestation, is a critical screening tool for structural fetal abnormalities. This ultrasound evaluates: - Brain and spine: Neural tube defects (spina bifida, anencephaly), ventriculomegaly, holoprosencephaly - Face: Cleft lip and palate - Heart: Congenital heart defects (ventricular septal defect, tetralogy of Fallot, transposition of the great arteries) - Abdomen: Abdominal wall defects (gastroschisis, omphalocele), bowel obstruction, kidney abnormalities - Limbs: Skeletal dysplasia, limb reduction defects - Soft markers: Echogenic bowel, choroid plexus cyst, echogenic intracardiac focus, shortened femur/humerus — which may indicate chromosomal abnormalities

The standard of care requires that the detailed anatomy ultrasound be performed by a trained sonographer and interpreted by a qualified physician. When structural abnormalities or soft markers are identified, the standard of care requires: - Communication of findings to the patient - Referral for targeted (Level II) ultrasound by a maternal-fetal medicine specialist - Offering diagnostic testing (amniocentesis) when structural abnormalities or soft markers suggest chromosomal abnormalities - Offering fetal echocardiography when cardiac abnormalities are suspected - Offering consultation with appropriate pediatric specialists

Failure to perform the detailed anatomy ultrasound, failure to identify visible abnormalities, failure to communicate findings, or failure to refer for further evaluation — all may constitute negligence.

How Screening Errors Happen

Prenatal screening errors can occur at multiple points in the process:

• Failure to offer screening: The provider does not offer NIPT, serum screening, carrier screening, or detailed anatomy ultrasound to the patient. ACOG recommends that ALL pregnant women be offered these tests.
• Failure to order the right tests: The provider orders an outdated or less sensitive screening test, or fails to order carrier screening when indicated by family history, ethnic background, or prior affected pregnancy.
• Timing errors: Screening tests have specific gestational age windows. Performing a test outside the appropriate window renders it invalid. For example, NT ultrasound must be performed at 11-14 weeks; a measurement at 16 weeks is not valid.
• Sample handling errors: Blood samples are mislabeled, lost, or improperly stored, leading to erroneous or unavailable results.
• Laboratory errors: The testing laboratory makes errors in analysis, reporting, or communication of results.
• Misinterpretation of results: The provider misinterprets the screening result — for example, treating a positive NIPT as a definitive diagnosis without confirmatory testing, or conversely, dismissing a positive screen as a false positive without investigation.
• Failure to communicate results: The provider receives abnormal results but fails to inform the patient in a timely manner — sometimes due to lost results, failure to follow up, or simple communication breakdowns.
• Failure to offer diagnostic testing: When screening is abnormal, the standard of care requires offering diagnostic testing (CVS or amniocentesis). Failure to offer confirmatory testing is a common malpractice scenario.
• Failure to document: Inadequate documentation of screening offered, results obtained, and patient counseling — which may itself be evidence of substandard care.

Wrongful Birth Claims in New York

A wrongful birth claim is a specific type of medical malpractice claim in which the parents allege that the healthcare provider's negligence deprived them of the opportunity to make an informed decision about whether to continue the pregnancy. New York courts recognize wrongful birth claims.

To prove a wrongful birth claim in New York, the plaintiff must establish: 1. The provider was negligent in failing to offer, perform, correctly interpret, or communicate prenatal screening results. 2. The negligence deprived the parents of information they needed to make an informed decision about the pregnancy. 3. The child was born with a genetic condition or disability that would have been detected with proper screening. 4. A reasonable person in the parents' position would have terminated the pregnancy (or made different decisions) had they been properly informed.

New York law allows parents to recover the extraordinary costs of raising a child with a genetic condition or disability — costs that would not have been incurred had the parents been properly informed. These damages include: - Medical expenses (past and future) related to the child's condition - Therapy and rehabilitation costs - Special education costs - Assistive care and equipment - Modifications to the home - Lost wages (for parents who must reduce or stop working to care for the child)

The damages are limited to the extraordinary costs — the additional costs beyond what would be incurred raising a child without the condition. Ordinary child-rearing expenses are not recoverable.

When Screening Negligence Constitutes Malpractice

Prenatal screening negligence constitutes medical malpractice when:

- The provider failed to offer screening: ACOG recommends that all pregnant women be offered NIPT and detailed anatomy ultrasound. Failure to offer screening is a deviation from the standard of care.

- The provider failed to order the right tests: When risk factors (advanced maternal age, family history, ethnic background, prior affected pregnancy) indicate an elevated risk, the provider must order appropriate screening and potentially diagnostic testing.

- Screening was performed at the wrong time: Tests performed outside their valid gestational age window are useless. The provider must ensure tests are performed at the correct time.

- Results were misinterpreted: The provider failed to recognize an abnormal result, or dismissed an abnormal result as a false positive without proper evaluation.

- Results were not communicated: The provider received abnormal results but failed to inform the patient, depriving them of the opportunity to seek diagnostic testing and make informed decisions.

- Diagnostic testing was not offered: When screening is abnormal, the standard of care requires offering diagnostic testing (CVS or amniocentesis). Failure to offer confirmatory testing is negligence.

- Counseling was inadequate: The provider failed to adequately counsel the patient about the meaning of screening results, the availability of diagnostic testing, and the options available upon receiving a diagnosis.

Expert testimony from a board-certified obstetrician or maternal-fetal medicine specialist, and potentially a genetic counselor, is required to establish the standard of care.

Damages in Wrongful Birth Cases

Damages in wrongful birth cases can be substantial, reflecting the lifelong costs of caring for a child with a genetic condition or disability: - Medical expenses: Past and future medical care related to the condition — surgeries, medications, specialist visits, hospitalizations. - Therapy and rehabilitation: Physical therapy, occupational therapy, speech therapy, behavioral therapy — often required for the child's entire life. - Special education: Special education services, tutoring, assistive technology, and potentially residential programs. - Assistive care: Home health aides, nursing care, and supervision — particularly for children with cognitive impairment who may require lifelong care. - Assistive equipment: Wheelchairs, braces, communication devices, and other adaptive equipment that must be replaced over time. - Home modifications: Ramps, widened doorways, accessible bathrooms, and other modifications needed to accommodate the child's disability. - Lost wages: For parents who must reduce or stop working to care for the child.

New York does not cap damages in wrongful birth cases, so the full extent of the extraordinary costs can be pursued. A life care planner typically projects these costs over the child's expected lifetime.

New York Statute of Limitations

Under CPLR § 214-a, the statute of limitations for medical malpractice is 2.5 years from the date of the negligent act. However, in wrongful birth cases, the negligence may have occurred at multiple points during the pregnancy — and the child's condition may not be diagnosed until after birth. The continuous treatment doctrine may extend the deadline if the patient continued receiving care from the same provider.

Additionally, the discovery rule under Lavern's Law may apply if the genetic condition was not discovered until later. The infancy toll (CPLR § 208) extends the child's own deadline to age 20.

Given the complexity of statute of limitations analysis in wrongful birth cases, it is critical to consult an attorney as early as possible. [Link to: /birth-injury/statute-of-limitations]

Frequently Asked Questions

The value of a medical malpractice case in New York depends on several factors, including the severity of the injury, the strength of liability evidence, and the economic and non-economic damages involved. New York is one of the few states with no caps on medical malpractice damages, meaning there is no artificial limit on what you can recover. Below are typical settlement ranges based on injury severity.