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Testosterone (Total)

Total Testosterone Serum Testosterone
Serum (SST, 9 AM fasting) nmol/L

About this test

Primary male sex hormone produced by testicular Leydig cells (and in smaller amounts by ovary and adrenal). Includes protein-bound (SHBG, albumin) and free fractions.

Reference Ranges

Sex Age Range Notes
Female ≥ 18 yrs 0.3 – 2.4 Adult female (premenopausal)
Male ≥ 18 yrs 9 – 35 Adult male 9 AM

Clinical Interpretation

Low / Decreased
Low — hypogonadism (primary: Klinefelter, testicular failure; secondary: pituitary disease, Kallmann's), obesity, chronic illness, ageing.
High / Increased
Elevated (female) — PCOS, congenital adrenal hyperplasia, ovarian tumour, adrenal tumour, exogenous androgen.

Related Tests

Free Testosterone Prolactin
Specimen
Serum (SST, 9 AM fasting)
Reporting Unit
nmol/L
Category
🔄 Hormones

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.