Urine pregnancy tests detect hCG, the hormone produced by the placenta after embryo implantation. Modern tests are highly accurate and can detect pregnancy as early as the first day of a missed period, though sensitivity varies by test.
This test is used to confirm or rule out pregnancy, evaluate possible early pregnancy symptoms, screen before medications or procedures that could affect a fetus, and confirm home test results. A serum quantitative hCG is more sensitive and provides numerical values when more detailed information is needed. Sample type is a urine specimen.