The HCG series one-step professional pregnancy tests are the preferred clinical brand for early detection of HCG (Human Chorionic Gonadotropin) in serum or urine specimens. This test kit is used to obtain a visual, qualitative result for early detection of pregnancy.
Normally pregnancy may be detected with a rapid test as early as on the first day of a missed period. However, depending on how concentrated the urine sample is (e.g. excessive water was taken in before collecting the sample etc.) and personal differences, a negative result may not indicate a woman is not pregnant. A second test may be repeated after 48 hours.