One Step HCG Urine Pregnancy Test measures the presence of the horrmone, Human Chorionic Gonadotrophin (HCG), in humanurine for the early detection of pregnancy. During pregnancy, the placenta produces HCG after the embryo attaches to the uterineining. This test is capable of detecting pregnancy the first day after a missed period. As pregnancy progresses, urine containshigher levels of HCG at concentrations of 25mlU/ml (Mili-nternational Units) or greater. The concentration of HCG in non-pregnantwomen is normally 5.0mlU/ml. At the time of the last missed menstrual period, urine HCG levels are about 100mlU/ml with peaklevels of 100.000 to 200.000mlU/ml. Each box contains: 1 foil pouch and instruction for use.Each pouch contains: 1Step HCG Urine Pregnancy Test Cassette, 1 Droper and 1 DesiccantThe test kit can be stored at room temperature (39F- 86F: 4'C-30'C) in the sealed pouch to the date of expiration. The test kitsshould be kept away from direct sunlight, moisture and heat. Do not freeze. Size:3.0mm,40pcs/box