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Double / Triple / Quadruple Marker in Pregnancy — What It Means

Informational only. Antenatal results should always be discussed with your obstetrician, who interprets them for your specific pregnancy.

These are blood tests that measure certain proteins and hormones from the placenta and baby. The results are combined with your age, weight, and pregnancy stage. Together they give a risk estimate as a number. These tests are part of a combined risk check for certain chromosomal conditions. The result is a probability figure, not a firm answer. It is used to guide further decisions with your obstetrician.

First trimester · Second trimester

Last reviewed: 2026-08-16

When is it done?

The double marker (PAPP-A and free beta-hCG) is done between 11 and 13+6 weeks. The triple marker (AFP, hCG, uE3) is done between 15 and 20 weeks. The quadruple marker adds inhibin A and is done in the same 15 to 20 week window.

Why is it done in pregnancy?

These tests are part of a combined risk check for certain chromosomal conditions. The result is a probability figure, not a firm answer. It is used to guide further decisions with your obstetrician.

About the reference range

Marker levels are reported as multiples of the median (MoM), which compares you with a reference group at the same pregnancy stage. They are not fixed reference ranges. Reading them needs special software, plus your age and clinical details, and specialist or obstetrician review. Raw numbers on their own are not meaningful.

What to discuss with your obstetrician

Ask your obstetrician what your risk estimate means for your age and full picture. Also ask what options exist if the risk is above a threshold. And ask if a detailed ultrasound or further testing is advised.

Questions to ask your obstetrician

About this result

  • What does my Double / Triple / Quadruple Marker result mean for me and my baby at this stage of pregnancy?
  • Is my Double / Triple / Quadruple Marker being read against a pregnancy-specific range?

Frequently asked questions

Is a high-risk result on a marker test a diagnosis?
No. A high-risk result is a risk estimate. It shows that further checks are advisable. It is not a firm finding of any condition. Most pregnancies with a high-risk result have unaffected babies.
What is the difference between the double, triple, and quadruple marker tests?
The double marker checks two substances, PAPP-A and free beta-hCG, in the first trimester. The triple marker adds AFP and uE3 in the second trimester. The quadruple marker adds inhibin A for possibly better accuracy. All are combined with ultrasound findings and your own factors to give a risk estimate.
What does 'high risk' on a marker test mean in practice?
A high-risk result usually means the calculated chance of certain chromosomal conditions is above a set threshold. This is often 1 in 250 or 1 in 270. It depends on the lab and guideline. Your obstetrician will discuss the options for more information.
What does 'low risk' on a marker test mean?
A low-risk result means the calculated chance is below the lab's threshold. This is reassuring. It does not fully rule out a chromosomal condition. Your obstetrician can explain what it means for your pregnancy.
Can marker test results vary with the baby's position or gestational age dating?
Yes. Accurate pregnancy dating, usually by an early ultrasound, is key for correct reading. All MoM values depend on the pregnancy stage, so wrong dating can shift the risk estimate. So your obstetrician may confirm your dates before reading the results.

Sources

  • ACOG (2020) — ACOG Practice Bulletin No. 226: Screening for Fetal Chromosomal Abnormalities
  • FOGSI (2021) — FOGSI Good Clinical Practice Recommendations: Antenatal Chromosomal Anomaly Screening

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