For menstruating women, what is the best day to test hormones?

The best day to test hormones is during the progesterone peak of the luteal phase, between days 19-21 of a 28-day cycle or ~7 days after ovulation (if tracking). For longer cycles, add the number of days beyond 28 days (example: collect days 21-23 for a 30-day cycle). In a similar manner, subtract for shorter cycles (example: collect days 17-19 for a 26-day cycle).
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