Rapid Visual Pregnancy Test conveniently identifies open animals on your farm. Simply perform a blood-based test, read, and interpret the results with ease. The test wells will appear blue if pregnant or match negative control if not pregnant. Rapid Visual Pregnancy Test detects a highly specific marker of pregnancy: pregnancy associated glycoproteins (PAGS), as early as 28 days post breeding with no interference from the previous pregnancy after 60 days post calving. Unlike progesterone levels that fluctuate naturally during a cycle, PAGS are only produced in the presence of an embryo or fetus.