HCG Pregnancy Test Strip One Step Pregnancy Test is a rapid, one-step lateral flow immunoassay in device format for the qualitative detection of human chorionic gonadotrophin (HCG) in urine to aid in the detection of pregnancy. The test utilizes a combination of antibodies including a monoclonal HCG antibody to selectively detect elevated levels of HCG. The assay is conducted by adding urine to the specimen well, and obtaining the result from the colored lines.