Detect pregnancy early, accurately, and from the comfort of your home with the King Test Rapid One Step hCG Midstream Pregnancy Test Kit. This self-performing immunoassay detects the presence of human chorionic gonadotropin (hCG) – the pregnancy hormone – in your urine, with over 99% accuracy from the day of your expected period. Its sensitive design can identify even tiny amounts of hCG as early as 4 days before your missed period.