Can NIPT Detect Down Syndrome?

How NIPT works

During pregnancy, tiny fragments of the baby's DNA circulate in the mother's blood. NIPT reads these fragments and checks whether there is an extra copy of chromosome 21, which causes Down syndrome. It can also look at chromosomes 18 and 13, and sometimes the sex chromosomes.

Because only a blood sample from the mother is needed, there is no risk to the baby from the test itself.

What NIPT can tell you

• Whether the chance of Down syndrome is low or high.
• The chance of trisomy 18 and trisomy 13 on most panels.
• The baby's sex, if you choose to know.

What NIPT cannot tell you

• It cannot confirm Down syndrome. It only estimates the chance.
• It does not check for every genetic or structural condition.
• It does not replace the detailed anomaly scan.
• Rarely, the result can be unclear or fail, and the test may need to be repeated.

Who should consider NIPT

NIPT can be offered to any pregnant woman. It is especially useful when:

• The first trimester screening shows an increased risk.
• The mother is of higher age.
• There has been a previous pregnancy with a chromosomal condition.
• A scan has shown a soft marker.

What happens after the result

A low-risk result is reassuring, but the routine scans should still be done. A high-risk result does not mean the baby definitely has Down syndrome. Your doctor will usually advise a diagnostic test such as amniocentesis or CVS, along with counselling, so you can take decisions with full information.

If you remember one thing

Choosing a prenatal test can feel overwhelming. Dr Malathi G. Prasad at Trichy Fetal Medicine and Fertility Centre in Trichy can explain which test suits your pregnancy and help you understand the results in plain language.

When you are ready, the NIPT service page covers timings and preparation; questions about your own situation are best put to our specialists.

Related guides

• NIPT in Twin Pregnancy: Is It Reliable?
• NT Scan vs Double Marker Test: What's the Difference?
• What Happens After a Positive NIPT Result?
• NT Scan in Pregnancy: Timing, Normal Range, Down Syndrome Screening and What the Result Means