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The Clearblue One-Month Digital Ovulation Test helps you to pinpoint the 2 fertile days in your cycle by identifying a sudden surge in Luteinizing Hormone (LH) in your body with a simple urine test. LH is the hormone that triggers the release of an egg from your ovary. This release – ovulation – usually occurs approximately 24 to 36 hours after the LH surge.
If you use it each day on the days around the time in your cycle when you expect the LH surge, you can predict the 2 days each cycle when you are most fertile and therefore most likely to get pregnant.