Synonyms: serum testosterone (ST)
Definition: (tes-TOS-ter-own) The hormone that promotes the development and maintenance of male secondary sexual characteristics. It is believed to comprise about 90 percent of the androgens in a man's body.
Most of the testosterone is produced in the testicles. Some is also produced at the adrenal glands. Halting the production and conversion of testosterone is the primary objective of hormone therapy.
See also dihydrotestosterone.