Predicts the 2 days when you are most likely to become pregnant. Easy-read result line. First Response Easy-Read Ovulation Predictor Test is an easy way to help you find the 2 days when you are most able to become pregnant. It quickly and accurately detects the increase in luteinizing hormone in your urine (LH surge), which normally occurs 24-36 hours before ovulation. Your two most fertile days begin with the LH surge. You are most likely to become pregnant if you have intercourse within 24-36 hours after you detect your LH surge. Easy to Use: One easy step. Simply hold the stick in your urine stream. No cup. No mess. Accurate: Over 98% accurate in laboratory studies. Fast: Easy-read results in just 5 minutes. Easy to Read: One purple line tells you the test is working. The appearance of a second line that is similar or darker in color than the first line means that you should ovulate within 24-36 hours. Now with easy-read result line. Convenient: Test any time of day. Pregnancy test inside! Test 5 days sooner - than other leading pregnancy tests. For in-vitro diagnostic use. Not to be taken internally.