48F. Irregular cycles, 3am wakeups, and she's tweezing her chin. Cycles were a reliable 28 days until last year. Now anywhere from 23 days to 7 weeks, heavier when they come. Wakes at 3am most nights. Shorter fuse than usual. Separately: coarse chin hairs, jawline breakouts she hasn't had since her twenties, and a part that keeps widening. Vertex thinning, frontal hairline intact. BMI 29. We draw a baseline — FSH, estradiol, total and free T, DHEA-S, TSH, CBC, ferritin, insulin. Not to diagnose her. Over 45 with cycle changes and symptoms, that's clinical. We draw it because you can't go back for a baseline two years from now. Everything comes back normal. FSH up a little. Estradiol mid-range. Total testosterone mid-normal. Free T upper end. Insulin high-normal. She has two hormonal problems anyway. One: no hot flashes, no dryness, but she's fragmenting sleep and bleeding heavier. That's not low estrogen. That's anovulatory cycling — no corpus luteum, no luteal progesterone, estradiol still swinging and periodically overshooting. Two: mid-normal testosterone, growing chin hair. Not a contradiction. Androgens decline slowly with age, estradiol falls off a cliff, so the ratio shifts even when the number doesn't. Add 5α-reductase converting testosterone to DHT — far more potent at the receptor — and you get androgen signal her total T will never show. Vertex thinning with an intact hairline and jawline acne are DHT's signature. Her insulin isn't incidental either; 5α-reductase runs hotter in insulin resistance. Normal panel, two problems. Neither one is a level — one's a ratio, the other's a conversion. That's the whole case for knowing the pathway. Not so you order a fancier test. So a normal result stops ending your thinking. Module 9 covers all of it. Classroom → Module 9: Hormones New chin hair and a widening part in a perimenopausal patient — what's your first move?