What is an ovulation test? An ovulation test (also sometimes called an OPK, which stands for ovulation predictor kit) is a test that detects the presence and concentration of luteinizing hormone (LH) in your urine. About 12 – 36 hours before ovulation, there is a brief surge in LH levels. (The length of time between the beginning of the LH surge and ovulation varies from woman to woman.) The LH surge sends a message to your ovaries that it’s time to release an egg: ovulation! When you get a positive ovulation test, it means that ovulation is likely imminent. Can ovulation kits help? Wondfo Ovulation Test can help you to identify your fertile window. An OPK is a quick, easy, and accurate way to predict ovulation in advance. It allows you to pinpoint your fertile window from the very first month. How to read the result?Positive (LH Surge): If two color bands are visible, and the test band is equal to or darker than the control band, you will probably ovulate in the next 24-48 hours. If trying to get pregnant, the best time to have intercourse is after 24 but before 48 hours. Negative (No LH Surge): Only one color band appears on the control region, or the test band appears but is lighter than the control band. This means there is no LH surge. Invalid: No visible band at all. Repeat with a new test kit. If test still fails, please contact the distributor or the store where you bought the product, with the lot number. How accurate are Wondfo home tests products? All our tests have proved greater than 99% accurate in laboratory and consumer studies. When to collect Urine for the test? Any urine specimen is appropriate for ovulation testing. Tests can be taken at any time of the day.