Double Marker Test and NT Scan: Everything You Need to Know During Early Pregnancy Double Marker Test and NT Scan The Double Marker Test and NT (Nuchal Translucency) Scan are two important prenatal screening tests performed during the first trimester of pregnancy . These tests help assess the risk of certain chromosomal abnormalities in the developing baby, allowing parents and doctors to make informed decisions about further care. Although these tests do not diagnose a genetic condition, they are highly valuable in identifying pregnancies that may require additional diagnostic testing. What is a Double Marker Test? The Double Marker Test is a blood test performed on the pregnant mother. It measures two important substances in the mother's blood: Free Beta-hCG (Human Chorionic Gonadotropin) PAPP-A (Pregnancy-Associated Plasma Protein-A) The levels of these markers, along with the mother's age, weight, and gestational age, are used to estimate the baby's risk of chromoso...