The Double Marker Test is a first-trimester blood test done between 9–13 weeks of pregnancy.
It measures two substances in the mother’s blood:
- Free β-hCG (Human Chorionic Gonadotropin)
- PAPP-A (Pregnancy-Associated Plasma Protein-A)
It is usually combined with the NT scan (Nuchal Translucency scan) to assess the baby’s risk for certain chromosomal conditions.
Benefits of the Double Marker Test
Early Screening for Chromosomal Conditions
It helps estimate the risk of:
- Down syndrome
- Edwards syndrome
- Patau syndrome
This is a screening test, not a diagnostic test. It tells you the probability (risk), not a confirmed diagnosis.
Early Detection = More Options
Because it is done in the first trimester, it gives:
- More time for additional testing (if needed)
- Time for informed decision-making
- Early specialist consultation
Non-Invasive and Safe
- Requires only a simple blood sample
- No risk to mother or baby
- No radiation
More Accurate When Combined With NT Scan
When combined with:
- Maternal age
- NT scan measurement
- Blood test values
It significantly improves screening accuracy compared to age alone.
How Results Are Reported
Results are usually given as a risk ratio, for example:
- 1 in 1,000 → Low risk
- 1 in 100 → Higher risk
Your doctor will interpret it based on your age and scan findings.
For More Details:
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