Perimenopause
Perimenopause can run for a decade before your final period, and it is where most women are told their labs are normal and sent away.
In perimenopause estradiol fluctuates unpredictably and often runs high rather than low, while progesterone falls first. A single hormone panel captures one point in a volatile sequence, so it frequently reads normal. Perimenopause is a clinical diagnosis based on cycle change and symptoms, and treating it means accepting that rather than waiting for a number.
Progesterone declines first as ovulation becomes intermittent, producing insomnia, anxiety, heavier bleeding and shorter cycles. Estradiol becomes erratic rather than simply low, which is why symptoms swing. Cortisol sensitivity rises, insulin sensitivity falls, and lean mass begins to decline. Thyroid disease presents identically and has to be excluded.
Cyclical or continuous progesterone, which often addresses sleep and anxiety before anything else is needed. Transdermal estradiol where vasomotor symptoms warrant it, dosed to symptoms. Contraception considerations, since pregnancy remains possible. Alongside: resistance training, protein intake, glycemic stability and sleep work — all of which matter more here than they did at thirty.
Complete thyroid function with antibodies, since it mimics perimenopause exactly. Estradiol, FSH and progesterone interpreted with cycle timing and known to be variable. Ferritin, given heavier bleeding. Fasting insulin, ApoB and lipids. Vitamin D. Any bleeding that is unusually heavy, prolonged or post-coital needs gynecological assessment rather than a hormone panel.
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