Perimenopause hormones: what to test, what most doctors miss
Perimenopause starts about ten years before the last period. Most patients are told to “wait and see” until symptoms force the issue. That window is when hormone optimization is most effective, and most missed.
What changes first
Progesterone drops first, usually starting in the late 30s. Estradiol becomes erratic before it drops – high one cycle, low the next. Testosterone slides quietly through the 40s. By the time FSH rises high enough for a conventional doctor to confirm “menopause,” the patient has already lived through five to ten years of hormone-driven symptoms with no protocol.
What to test (and when)
The two mistakes we see most often: testing the wrong markers, and testing on the wrong day of the cycle. If a woman is still cycling, the most useful workup runs:
- Progesterone on day 21 of the cycle. Day 21 is the peak of the luteal phase. A low progesterone here is one of the cleanest markers of perimenopause. Optimal: 5 to 15 ng/mL on day 21.
- Estradiol on day 21. Should be in the 100 to 200 pg/mL range during the luteal phase. Below 50 in a cycling woman often points to anovulatory cycles.
- FSH on day 3. Cycle day 3 only. Rising FSH (above 10 to 15) confirms ovarian reserve is dropping.
- Total + Free Testosterone. Either cycle day. Low total testosterone under 25 ng/dL with symptoms (low libido, low energy, weight gain) is common and treatable.
- DHEA-S. Adrenal reserve. Often low in stressed perimenopausal women.
- SHBG. The carrier protein. High SHBG (above 80) sequesters usable hormones; low SHBG (under 30) signals insulin resistance.
- Thyroid panel. Thyroid and sex hormones interact in ways that change symptoms. Always paired.
- Vitamin D, RBC magnesium, B12. Micronutrients that affect hormone metabolism.
If a patient is no longer cycling, the day-21 timing question disappears – we just draw a single set. But for women still cycling, the wrong-day draw is the single most common reason a perimenopause picture gets missed.
What the protocol looks like
Most patients do not need full hormone replacement. They need targeted support for the specific imbalance the labs show. Often that is bioidentical progesterone (100 to 200 mg oral at bedtime) plus low-dose estradiol patch when symptoms warrant. Testosterone (compounded cream at 1 to 5 mg daily) when total T is low and symptoms support it. Always paired with adrenal, thyroid, and micronutrient optimization, because the systems do not act independently.
We run recheck labs at 8 to 12 weeks and adjust based on what the data shows.
If you have been told to wait
Waiting is reasonable advice for some things. Hormone dysregulation in your 40s is not one of them. See how the hormone workup runs at Copper Sage, or read about the 100+ marker panel we use.