The Free Beta Human Chorionic Gonadotropin (Free Beta HCG) test is a blood test that measures the level of a hormone called human chorionic gonadotropin (HCG) in the blood. HCG is produced by the placenta during pregnancy and is typically detectable in the blood within 11 days after conception. The Free Beta HCG test measures a specific form of HCG that is free-floating in the bloodstream and is not bound to other molecules. This form of HCG is useful in determining the risk of certain chromosomal abnormalities in a developing fetus, such as Down syndrome, Trisomy 18, or neural tube defects. The test is also used to monitor the progression of pregnancy and to diagnose or rule out conditions such as ectopic pregnancy or gestational trophoblastic disease. The Free Beta HCG test is a simple and relatively non-invasive procedure that involves drawing a blood sample from a vein.