How is a DNA test done during pregnancy?

A DNA test during pregnancy is most commonly done through a simple maternal blood draw. The blood contains cell-free fetal DNA, which is analyzed in a lab to screen for chromosomal conditions. This is called NIPT or non-invasive prenatal testing.

Is NIPT safe for the baby?

Yes, NIPT is completely safe for the baby because it only requires a blood sample from the mother. There is no risk of miscarriage or harm to the fetus.

How early can you get a DNA test while pregnant?

NIPT can be performed as early as 9–10 weeks of pregnancy. The test requires a minimum fetal fraction of about 4% to produce reliable results.

What does NIPT screen for?

NIPT primarily screens for trisomies 21, 18, and 13, as well as sex chromosome aneuploidies. Some expanded panels also screen for certain microdeletions like DiGeorge syndrome.

Is NIPT covered by insurance in the US?

Many US insurance plans cover NIPT for women of advanced maternal age (35+) or those with other risk factors. Coverage varies; check with your provider. Out-of-pocket costs typically range from a few hundred to under a thousand dollars.

How is a DNA test done during pregnancy?

A DNA test during pregnancy is most commonly done through a simple maternal blood draw. The blood contains cell-free fetal DNA, which is analyzed in a lab to screen for chromosomal conditions. This is called NIPT or non-invasive prenatal testing.

Is NIPT safe for the baby?

Yes, NIPT is completely safe for the baby because it only requires a blood sample from the mother. There is no risk of miscarriage or harm to the fetus.

How early can you get a DNA test while pregnant?

NIPT can be performed as early as 9–10 weeks of pregnancy. The test requires a minimum fetal fraction of about 4% to produce reliable results.

What does NIPT screen for?

NIPT primarily screens for trisomies 21, 18, and 13, as well as sex chromosome aneuploidies. Some expanded panels also screen for certain microdeletions like DiGeorge syndrome.

Is NIPT covered by insurance in the US?

Many US insurance plans cover NIPT for women of advanced maternal age (35+) or those with other risk factors. Coverage varies; check with your provider. Out-of-pocket costs typically range from a few hundred to under a thousand dollars.

How Do They Do a DNA Test While Pregnant?

Learn how NIPT uses cell-free DNA to screen for fetal conditions. A US-focused guide to non-invasive prenatal testing and next steps.

A DNA test while pregnant is most commonly performed using a simple blood draw from the mother’s arm. This test, called non-invasive prenatal testing (NIPT) or cell-free DNA screening, analyzes small fragments of fetal DNA that naturally circulate in the mother’s bloodstream. No needles enter the uterus, and there is no risk to the baby. The blood sample is sent to a laboratory, where technicians separate the fetal DNA from the mother’s DNA and scan it for extra or missing chromosomes. Results typically return within 7–10 business days. For US patients in 2026, NIPT is the most widely recommended first-line screening for common chromosomal conditions such as Down syndrome (trisomy 21), Edwards syndrome (trisomy 18), and Patau syndrome (trisomy 13).

What Is Non-Invasive Prenatal Testing (NIPT)?

NIPT is a screening test—not a diagnostic test—that evaluates the risk of certain fetal chromosomal abnormalities. It is performed as early as 9–10 weeks of pregnancy and can be done at any routine prenatal appointment or through a direct-to-consumer lab order. The test requires only a maternal blood sample, making it safe for both mother and baby.

How Cell-Free DNA Works

During pregnancy, a small percentage of the DNA in the mother’s blood comes from the placenta, which generally has the same genetic makeup as the fetus. This cell-free fetal DNA (cffDNA) is present in fragments. The lab measures the relative amount of each chromosome in the sample. If there is more or less DNA from a particular chromosome than expected, it suggests a possible trisomy (an extra copy) or monosomy (a missing copy). The test also reports the fetal fraction—the proportion of fetal DNA in the sample—which must be above a certain threshold (typically 4%) for reliable results.

What NIPT Screens For

Common trisomies: Trisomy 21 (Down syndrome), trisomy 18 (Edwards syndrome), trisomy 13 (Patau syndrome)
Sex chromosome aneuploidies: Conditions like Turner syndrome (XO), Klinefelter syndrome (XXY), and Triple X syndrome (XXX)
Fetal sex: The presence or absence of a Y chromosome is reported, which can indicate the baby’s sex
Some microdeletions: Certain labs offer expanded panels that screen for DiGeorge syndrome (22q11.2 deletion) and other rare deletions

NIPT does not screen for neural tube defects (like spina bifida) or structural abnormalities. For those, a separate maternal blood test (the quad screen) or ultrasound is used.

Comparison of Common Prenatal Screening Tests (2026 US Practice)

Test Type	When Done	How It Works	What It Screens
NIPT (cell-free DNA)	From 9–10 weeks	Maternal blood draw; analyzes fetal DNA	Trisomies 21, 18, 13; sex chromosomes
First-trimester screening	11–13 weeks	Blood test + nuchal translucency ultrasound	Trisomies 21, 18; neural tube risk
Quad screen	15–20 weeks	Maternal blood draw; measures four markers	Trisomies 21, 18; neural tube defects
Integrated screening	First + second trimester	Combines first-trimester and quad screen results	Comprehensive risk assessment

What About Diagnostic Tests?

If NIPT or other screening results show an increased risk, a diagnostic test may be offered. Chorionic villus sampling (CVS) is performed at 10–13 weeks and involves taking a small sample of placental tissue. Amniocentesis is done at 15–20 weeks and samples the amniotic fluid. Both carry a small risk of miscarriage (roughly 1 in 300 to 1 in 500 for CVS, and about 1 in 500 to 1 in 1,000 for amniocentesis). A genetic counselor can help you weigh the risks and benefits.

Other DNA Tests During Pregnancy

Carrier Screening

Carrier screening is a separate blood test that checks if the mother (and sometimes the father) carries a gene for a recessive condition such as cystic fibrosis, spinal muscular atrophy (SMA), or fragile X syndrome. It is not a DNA test on the fetus, but on the parents. If both parents are carriers, the fetus may be at higher risk. Many US obstetricians now offer expanded carrier screening as part of routine prenatal care.

Prenatal Paternity Test

A prenatal paternity test can be performed using NIPT-style technology (maternal blood draw) as early as 9 weeks. It compares fetal DNA fragments to a DNA sample from the alleged father. This is a separate test and is not included in standard prenatal screening panels.

Understanding Your Results

NIPT results are reported as “low risk” or “high risk.” A high-risk result does not mean the baby definitely has a condition; it means further testing (diagnostic) is recommended. A low-risk result is reassuring but does not guarantee a healthy baby. False positives and false negatives are possible, especially for rare conditions. Always discuss results with your healthcare provider or a genetic counselor.

If you are ready to take a proactive step in your prenatal care, you can order a prenatal screening panel online and receive your results quickly, directly from a CLIA-certified lab.