Know Your Cycle Pattern How long the luteinizing hormone (LH) surge, triggers the release of an egg, lasts can vary from woman to woman. During the LH surge, LH can reach its peak in just a few hours (rapid onset), or it can take up to several days to reach peak before ovulation (gradual onset). Download Premom Ovulation Calculator App and get ready to track your personal ovulation cycle. Test at the Right Time For ovulation tests, testing from noon to early evening gives you the most accurate concentration for testing. Test twice per day when the line starts getting darker. For pregnancy tests, first morning urine is recommended for the most accuracy. Cross-check Symptoms The basis for basal body temperature is identifying the increase in a hormone called progesterone that occurs after successful ovulation.
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