A **triple marker test** is a prenatal screening performed during the second trimester of pregnancy to assess the risk of certain genetic conditions in the fetus. It measures three substances in the mother's blood: alpha-fetoprotein (AFP), human chorionic gonadotropin (hCG), and estriol. The test helps evaluate the risk of conditions such as Down syndrome, Trisomy 18, and neural tube defects. Although not diagnostic, abnormal results may lead to further testing, like amniocentesis, to confirm any findings.
Clinical purpose and recommended diagnostic indicators
A **triple marker test** is a prenatal screening performed during the second trimester of pregnancy, typically between the 15th and 20th week. It measures three specific substances in the mother's blood: **alpha-fetoprotein (AFP)**, **human chorionic gonadotropin (hCG)**, and **estriol**. The levels of these markers help assess the risk of certain genetic conditions and birth defects in the fetus, such as **Down syndrome**, **Trisomy 18**, and **neural tube defects** like spina bifida.
While the test cannot diagnose conditions directly, abnormal results indicate an increased risk, prompting healthcare providers to recommend further diagnostic testing, such as **amniocentesis** or **chorionic villus sampling (CVS)**. The triple marker test is considered a non-invasive, routine screening tool that helps in early identification of potential issues, allowing for informed decisions and appropriate prenatal care.
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