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Ovulation predictor kits (OPKs) 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, though this can vary from woman to woman.
When using standard ovulation tests, begin testing several days before you expect your LH surge to begin. If your cycles are irregular, or you have no idea when you ovulate, you can begin testing 5 days after your period ends
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