The Recare Ovulation Test is a self-testing one- step assay designed for in vitro qualitative determination of human Luteinizing hormone (LH) in urine to predict time of ovulation. Ovulation is the release of an egg from your ovary. A low background level of Luteinizing Hormone (LH) is always present in your urine. At about the middle of your monthly cycle the LH increases suddenly to a high surge level which causes the release of an egg from your ovary (ovulation) about 14 to 48 hours later. To become pregnant the egg must be fertilized with a sperm cell in time. Therefore your most fertile time is when you are ovulating. This test can help you predict your ovulation time quickly and easily.