Quidel Quickvue One-Step HCG Test offers easy, one-step sensitive immunoassay for the qualitative detection of human chorionic gonadotropin (HCG) in urine or serum for the early detection of pregnancy. The test needs no refrigeration space, no wait for reagents to warm up and can be run immediately as needed. The test has ability to detect low HCG levels as early as 2-3 days before expected menses.