What is NIPT (a blood test that screens your baby's DNA), and what can it tell me?
In short
- NIPT is a blood test. It looks at tiny bits of your baby's DNA in your blood.
- It can be done from 10 weeks.
- It screens for Down syndrome and similar conditions. It is not a diagnosis, and can be wrong.
- A high-chance result should be checked with a follow-up test; your doctor will guide you.
What happens
- A blood sample is taken from your arm, from 10 weeks onward.
- The lab analyses fragments of placental DNA circulating in your blood.
- Your result is reported as low-chance or high-chance (or occasionally "no result", which may need a repeat test) for each condition screened.
The details: numbers and where they differ
In the source's own words
NIPT is a screening test, not a diagnostic one, and it can produce both false positive results (indicating increased risk when the fetus is unaffected) and false negative results (indicating decreased risk when the fetus is actually affected). A positive (high-risk) NIPT result should be followed by diagnostic testing to confirm the finding before a genetic condition is considered established.
MedlinePlus Genetics (NIH/National Library of Medicine), Noninvasive prenatal testing (NIPT). Quoted verbatim.
The numbers
| Measure | Value | Source |
|---|---|---|
| NIPT / cell-free DNA earliest window (pregnant women) | ≥10 weeks gestation | MedlinePlus Genetics (NIH/National Library of Medicine) |
When to call your doctor
- If your result comes back high-chance — ask about a diagnostic test (amniocentesis or CVS) to confirm it before any decisions are made.
- If your test comes back as "no result" and you're not sure what happens next.
Discuss your results with your doctor: this page reports what these sources say, not advice for your situation.
Sources
- MedlinePlus Genetics (NIH/National Library of Medicine), Noninvasive prenatal testing (NIPT). Quoted verbatim. US federal government work, public domain.
- American College of Obstetricians and Gynecologists (ACOG), Prenatal Genetic Screening Tests (Patient FAQ). Named as the guideline this section describes; its text and tables are not reproduced here (All rights reserved (cite only)). Describes cell-free DNA testing as usable from 10 weeks, screening for Down syndrome, Patau syndrome, Edwards syndrome and sex-chromosome differences, with a positive result needing follow-up by amniocentesis or CVS.
Sources checked 2026-09-26. How we source and check every page.
Educational summary of named sources, not medical advice.