High Testosterone in Women: What Counts as High, and What's Behind It

What actually counts as “high”

A total testosterone result only means something next to a reference range, and the range itself moves with age, the time of day you were drawn, and which assay your lab used. In a study of 161 healthy, normally cycling women aged 18 to 49, the estimated normal range (5th–95th percentile) for a 30-year-old was 15–46 ng/dL total testosterone and 1.2–6.4 pg/mL free testosterone, using extraction and chromatography methods rather than a direct immunoassay (Braunstein et al., 2011). Concentrations decline gradually across the reproductive years, so the same number can sit inside the range at 20 and above it at 40.

SHBG (sex hormone-binding globulin) is the variable that makes total testosterone hard to interpret on its own. In the same study, SHBG ranged from 18 to 86 nmol/L — a near five-fold spread. SHBG binds testosterone and keeps it inactive, so two women with an identical total testosterone can have very different amounts of hormone actually free to act on skin and hair follicles.

Marker	Typical range	What moves it
Total testosterone	15–46 ng/dL	Ovarian and adrenal androgen production
Free testosterone (direct)	1.2–6.4 pg/mL	Direct assays are unreliable at these low levels
Calculated free testosterone	1.3–5.6 pg/mL	Total testosterone and SHBG together
SHBG	18–86 nmol/L	Insulin (lowers it), oestrogen and thyroid status (raise it)

Because a direct free-testosterone immunoassay is unreliable at the concentrations typical in women, the guideline on this recommends measuring SHBG and total testosterone together and calculating free testosterone from the two, rather than trusting a direct free-T result on its own (Martin et al., 2018).

What’s actually driving it — and why the name on the chart changed

PCOS is overwhelmingly the leading cause. A 2012 consensus statement estimated that PCOS accounts for roughly 70–80% of biochemical hyperandrogenism in women of reproductive age, with rarer adrenal and tumor-related causes making up a small remainder (Escobar-Morreale et al., 2012).

In May 2026, that condition was renamed polyendocrine metabolic ovarian syndrome — PMOS — by a global consensus process spanning more than 50 academic, clinical and patient organisations, published in The Lancet (Teede et al., 2026). The biology, the diagnostic criteria and the treatments did not change. The old name pointed at the ovaries; the new one names the endocrine and metabolic features — including the androgen excess this article is about — that actually drive most of what you feel. This page uses PCOS and PMOS interchangeably, because both will show up in your records.

The much shorter list of other causes matters because a couple of them need urgent attention:

• Nonclassic congenital adrenal hyperplasia — an inherited adrenal enzyme deficiency, usually flagged by an early morning 17-hydroxyprogesterone test.
• Androgen-secreting tumor of the ovary or adrenal gland — rare, but the one a clinician rules out fast when testosterone is very high and symptoms appeared over months, not years.
• Cushing’s syndrome — cortisol excess, often with central weight gain and skin changes alongside the androgen picture.
• Medication or supplement exposure — exogenous testosterone, DHEA supplements, danazol and valproate can all raise it.

One category deliberately isn’t on that list: idiopathic hirsutism, where visible hair growth happens with a normal testosterone level because the hair follicles themselves are more sensitive to it. If your labs come back unremarkable but the hair growth is real, that isn’t a lab error — it’s a different mechanism, and it doesn’t need the same workup.

How doctors actually test for it

A random total testosterone is the recommended first test for any woman with an abnormal degree of hair growth. If suspicion is higher — faster onset, more severe symptoms, or an ambiguous first result — the guideline recommends adding a morning free testosterone and SHBG at the same time (Martin et al., 2018). Morning is not arbitrary: androgens, like most steroid hormones, run higher earlier in the day.

Two details change how a clinician reads the result. First, hormonal contraception raises SHBG substantially, which can push a calculated free testosterone artificially low — say so if you’re on the pill when you’re tested. Second, the speed of onset matters as much as the number. Gradual hair or cycle changes over years point toward PCOS/PMOS. Rapid change over weeks or months — especially alongside deepening of the voice, clitoral enlargement, or new muscularity — points away from it and toward the rarer causes above, and is imaged rather than watched.

Cause	How common	Confirmed with
PCOS / PMOS	Most common — an estimated 70–80% of cases	Cycle history, ultrasound or AMH, ruling out other causes
Nonclassic congenital adrenal hyperplasia	Uncommon	Morning 17-hydroxyprogesterone
Androgen-secreting tumor	Rare	Very high testosterone plus imaging
Cushing’s syndrome	Rare	24-hour urine cortisol or dexamethasone suppression test
Medication or supplement exposure	Uncommon	Timeline review with your prescriber

Why insulin makes this worse, whatever the underlying cause

If PCOS/PMOS is the driver, insulin resistance is usually part of the mechanism, not a side note. Higher circulating insulin pushes the ovary’s theca cells to produce more androgen, and it lowers SHBG at the same time — which means more of your existing testosterone is left unbound and active. That combination is one reason insulin resistance and PCOS travel together so consistently, and why addressing insulin sensitivity is often part of managing androgen excess even when no single “cause” gets pinned down.

Does this look different depending on your phenotype?

Yes, by definition. A PMOS diagnosis needs two of three features — irregular ovulation, polycystic ovarian morphology, and biochemical or clinical androgen excess — so testosterone can be entirely normal in someone who still meets criteria through the other two (Teede et al., 2023). If your testosterone is normal, androgen-lowering medication has little to work with, and skin or hair symptoms are better addressed directly. The four phenotypes breaks down which combination you’re likely dealing with and what tends to help each one.

What actually helps once a cause is identified

When PCOS/PMOS is the cause, the guideline’s first-line approach is a combined oral contraceptive, which lowers ovarian androgen production and raises SHBG. If symptoms haven’t improved enough after about six months, an antiandrogen — spironolactone at 100–200 mg daily is the one with the most evidence — is added. Finasteride is a second option. Flutamide is specifically not recommended, because of its liver toxicity risk relative to its benefit (Martin et al., 2018). None of this is a cure — it manages the hormone level and what it produces, and it needs a prescriber, not a supplement aisle.

Your next step

Before your next blood draw, ask specifically for SHBG alongside total testosterone — not testosterone alone — so a calculated free testosterone can actually be worked out. If you’re on hormonal contraception, mention it when you book, since it changes how the result should be read. And if you can, note down when the changes you’re seeing actually started: that single timeline detail is what tells a clinician whether this needs a routine follow-up or an urgent one.