The Double Marker Test is a vital prenatal screening test done during the first trimester (between 11 to 14 weeks of pregnancy) to evaluate the risk of chromosomal abnormalities in the developing fetus. It primarily measures the levels of free Beta-hCG (human chorionic gonadotropin) and PAPP-A (Pregnancy-Associated Plasma Protein-A) in the mother’s blood. Abnormal values may indicate ... https://redcliffelabs.com/double-marker-test