How does the First Response Ovulation Test work?
The First Response Ovulation Test will help you find the time that you are most able to become pregnant. It can also help you plan your pregnancy. The test measures luteinising hormone (LH), which is always present in your urine and increases just before your most fertile day of the month. This increase, or ‘surge’, in LH triggers ovulation which is the release of an egg from an ovary. The appearance of two easy-to-read purple lines in the test’s Result Window indicates your LH surge prior to ovulation. Most women will ovulate within 24 to 36 hours after the LH surge is detected. Predicting ovulation in advance is important because the egg can be fertilised only 6 to 24 hours after ovulation. Your two most fertile days begin with the LH surge. You are most likely to become pregnant if you have intercourse within 24 to 36 hours after you detect your LH surge.
