what is double marker test

The double marker test is a first-trimester pregnancy blood screening used to assess the risk of chromosomal abnormalities in the baby, especially Down syndrome and Edwards syndrome. It usually measures beta-hCG and PAPP-A in the mother’s blood.

What it checks

• It helps doctors estimate whether the pregnancy is low risk or high risk for certain genetic conditions.

• It is a screening test, not a diagnostic test , so an abnormal result does not mean the baby definitely has a problem.

When it is done

• It is usually done in the first trimester , commonly around 11 to 14 weeks of pregnancy.

What the result means

• Results are often reported as a risk ratio , such as 1:1000 or 1:250.

• A lower-risk result means the chance of a chromosomal issue is smaller, while a higher-risk result may lead the doctor to suggest more testing.

Simple example

If a report says 1:1000 , that means the estimated chance is 1 in 1000. If it says 1:250 , the risk is higher and your doctor may discuss follow-up tests.

If you want, I can also explain the difference between double marker and triple marker tests in simple terms.