Perimenopause is not a mood, it is an endocrine event

Perimenopause can start in the late thirties and run for a decade. During it, estradiol does not decline smoothly, it oscillates violently, and progesterone falls off earlier and faster.

The symptoms that follow, disrupted sleep, anxiety that feels chemical rather than situational, joint pain, brain fog, are frequently attributed to stress or aging and treated with an antidepressant.

Testing during perimenopause is genuinely harder than during menopause because a single-day draw catches an oscillating system at one arbitrary point. This is an argument for repeat testing across cycles and for weighting symptoms alongside numbers, not for skipping testing.

We run estradiol, progesterone, FSH, LH, total and free testosterone, SHBG, a full thyroid panel, and ferritin, then repeat rather than deciding from one draw. Treatment usually starts with progesterone for sleep and moves to estradiol as indicated, with low-dose testosterone where libido and energy are the primary complaints.

The point is not to force numbers into a range. It is to make the ten years livable, with a record you and your clinician can both see.