Human chorionic gonadotropin (HCG) is a hormone, produced by the developing placenta shortly after the conception and secreted into the urine. One Step hCG Pregnancy Urine Test is a rapid pregnancy test. It adopts double antibody sandwich method detects the presence of human chorionic gonadotropin (hCG), which appears in urine very early during pregnancy. Characteristic: Early detection of pregnancy as early as 7 days after the fertilized egg implantation Simple to use A variety of design specifications suitable for self-testing use and for professional use Results in 3 to 5 minutes Store in room temperature 24 months shelf life