A Reproductive Lexicon


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LH surge

The LH surge occurs at the halfway point of the menstrual cycle (usually between days 12 and 16) and induces ovulation and formation of the corpus luteum. It is accompanied by a smaller FSH surge. A woman trying to conceive can use a kit to detect the point of the LH surge, where 24-36 hours after a positive result is usually the optimal time for intercourse.