Rapid Response Midstream Urine Pregnancy Test HCG-1M1. The Rapid Response hCG Pregnancy Midstream Test is a rapid, self-performing, qualitative test for the determination of human chorionic gonadotropin in human urine specimens, to aid in the early detection of pregnancy. Results in just 3 minutes. Interpretation of test results are: positive (two lines), negative (one line), invalid (no lines or no Control line). Sensitivity: 20 mIU/mL. Test Principle: Lateral Flow Immunoassay. Room temperature storage. Excellent for home testing too. 1TEST/PK, 25PK/BX. Priced per box.