Progesterone

TIMING: For cycling women, progesterone must be drawn on day 19–22 of a 28-day cycle (approximately 7 days after ovulation) to capture peak luteal levels. Drawing at the wrong cycle day is the #1 cause of misleading results. Time of day matters — progesterone pulses, so morning draws may differ from afternoon. For women on progesterone BHRT (creams, capsules), draw at trough: 12–24 hours after your last dose. Oral progesterone (Prometrium) metabolizes differently than topical — expected levels differ by delivery method. Post-menopausal women on BHRT may have levels above standard ranges, which is expected. These notes reflect common practices in BHRT/functional medicine communities.

Reflects common practices in thyroid, BHRT, and functional medicine communities. This may differ from standard clinical guidelines. Not medical advice — always discuss with your provider.