Testosterone

SI UNITS (recommended)

CONVENTIONAL UNITS



* The SI unit is the recommended method of reporting clinical laboratory results

Synonym
17β‑hydroxyandrostenone
Units of measurement
nmol/L, ng/mL, ng/dL, ng/100mL, ng%, ng/L, µg/L

The androgen testosterone (17β‑hydroxyandrostenone) has a molecular weight of 288 daltons. In men, testosterone is synthesized almost exclusively by the Leydig cells of the testes. The secretion of testosterone is regulated by luteinizing hormone (LH), and is subject to negative feedback via the pituitary and hypothalamus.

Testosterone promotes the development of the secondary sex characteristics in men and serves to maintain the function of the prostate and seminal vesicles. Most of the circulating testosterone is bound to carrier proteins (SHBG = sex hormone‑binding globulin). In women, small quantities of testosterone are formed in the ovaries. In physiological concentrations, androgens have no specific effects in women. Increased production of testosterone in women can cause virilization (depending on the increase).

Reference Intervals

Method: The electrochemiluminescence immunoassay “ECLIA”

Test subjects ng/ml ng/dL nmol/L
Males 20-49 years 2.49-8.36 249-836 8.64-29.0
Males ≥ 50 years 1.93-7.40 193-740 6.68-25.7
Females 20-49 years 0.084-0.481 8.40-48.1 0.290-1.67
Females ≥ 50 years 0.029-0.408 2.90-40.8 0.101-1.42

SI units Conversion Calculator. Convert Testosterone level to nmol/L, ng/mL, ng/dL, ng/100mL, ng%, ng/L, µg/L. Clinical laboratory units online conversion from conventional or traditional units to Si units. Table of conversion factors for Testosterone unit conversion to nmol/L, ng/mL, ng/dL, ng/100mL, ng%, ng/L, µg/L.