Every women's hormone biomarker we test, explained

The primary estrogen — drives the menstrual cycle, mood, skin, bone and brain health.

The calming, balancing hormone — only made after ovulation. Drops first in perimenopause.

Pituitary signal that recruits ovarian follicles each cycle. Climbs as ovarian reserve drops.

Triggers ovulation. The LH:FSH ratio is a classic PCOS clue.

Pituitary hormone that can suppress ovulation when chronically elevated.

Women make testosterone too — it drives libido, muscle, mood and confidence.

The protein that decides how much of your sex hormones are 'free' and active.

Best single marker of ovarian reserve — how many eggs are left.

Pituitary signal to the thyroid — the first marker labs run, and the easiest to misread.

The thyroid's main 'storage' hormone, converted to active T3 in tissues.

The active thyroid hormone your cells actually use.

The autoantibody marker for Hashimoto's — the most common thyroid disease in women.

The adrenal precursor that feeds into testosterone and estrogen. Falls steadily with age.

Your main stress hormone — drives the rhythm of energy, sleep and blood sugar.

Three-month average blood sugar — a window into metabolic and hormonal health.

Catches insulin resistance years before fasting glucose moves.

Iron storage — the most common nutrient deficiency in menstruating women.

Hormone, not just a vitamin — drives bone, immune, mood and fertility.

Essential for energy, mood, methylation and nerve function.