Testosterone is the primary male sex hormone. However, it is present in both men and women. In men, testosterone is produced primarily in the testicles. Small amounts of testosterone are produced by the ovaries in women and the adrenal glands in both sexes.  Measuring testosterone can help to diagnose the cause for a number of conditions in men such as delayed or early puberty, erectile dysfunction, and testicular tumors. It can also help evaluate conditions which affect both men and women such as decreased sex drive, infertility and pituitary disorders.

This test is intended to measure testosterone in people for whom a standard. Testosterone Blood Test may not be sensitive enough to provide accurate results.  For certain groups of people who typically have lower testosterone levels such as women, children and men whose bodies do not produce enough testosterone (hypogonadism), a LC/MS-MS test may be a better option.