Ovulation test strips or ovulation predictor kits (OPKs) are at-home tests you can use to determine when you’re ovulating. Because you’re most fertile during ovulation, the kits can help increase your chances for success when you’re trying to conceive. Ovulation test strips work by measuring levels of luteinizing hormone (LH) in your urine. A rise in LH signals the ovary to release an egg — so when your levels reach a certain threshold, it’s safe to assume that ovulation will occur within the next 12 to 36 hours.

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