What is blood test for testosterone?

A blood test for testosterone measures the level of testosterone, a key hormone in both men and women, circulating in the bloodstream. It is commonly used to diagnose conditions related to hormone imbalances, such as low testosterone levels (hypogonadism) or to evaluate symptoms like fatigue, depression, or reduced libido. The test can measure total testosterone, which includes both bound and free testosterone, as well as free testosterone, which is the active form of the hormone. Results are typically interpreted alongside clinical symptoms and other lab tests for a comprehensive assessment.