What does high testosterone mean in a woman?

Testosterone is a normal female hormone. Women produce it in the ovaries and adrenal glands, at roughly a tenth to a twentieth of male concentrations, and it contributes to libido, muscle and bone. A high result matters in context: what the symptoms are, how fast they appeared, and whether the assay was capable of measuring female-range concentrations accurately. PCOS is by far the commonest explanation for a mild elevation.

How it should be measured

The 2023 International Evidence-based Guideline recommends total and free testosterone to assess biochemical hyperandrogenism, with free testosterone estimated by the calculated free androgen index. It also recommends that laboratories use validated LC-MS/MS assays for total testosterone, because direct immunoassays are unreliable at female concentrations. Direct free testosterone immunoassays should not be used. Sampling is in the morning, and androgens cannot be interpreted at all on a combined oral contraceptive pill, which raises sex hormone binding globulin.

What causes a genuinely high result

PCOS accounts for most cases. Nonclassic congenital adrenal hyperplasia is the main alternative and is screened with an early morning 17-hydroxyprogesterone taken in the follicular phase. If total and free testosterone are not elevated but the picture still fits, the guideline says androstenedione and DHEA-S could be measured, while noting their limited additional value. Cushing syndrome, certain medications and, rarely, an androgen-producing tumour of the ovary or adrenal gland complete the list.

When the pattern is concerning

Speed and severity are the two features that change the workup. Androgen excess from PCOS builds gradually over years. Symptoms that appear over a few months, or that include voice deepening, clitoral enlargement, male pattern balding or muscle bulking, warrant prompt evaluation for an androgen-secreting tumour, with imaging of the ovaries and adrenal glands. That combination is uncommon, but it is the reason a clinician asks how quickly things changed.

If you have a high testosterone result, check three things before drawing conclusions: was it total or free, was it a mass spectrometry assay, and were you on hormonal contraception at the time. A result taken on the pill, or by a direct free testosterone immunoassay, may need repeating before it can be used.