What is total testosterone?

Total testosterone is a blood test that measures the sum of all testosterone circulating in the bloodstream. It includes testosterone bound to sex hormone-binding globulin (SHBG) and albumin, plus the small fraction that exists as free testosterone. This combined measurement represents the most straightforward way to gauge whether a man's testosterone production is adequate.

For adult men, normal total testosterone typically falls between 300 and 1000 ng/dL (nanograms per deciliter), though reference ranges vary slightly between laboratories. Values below 300 ng/dL generally indicate low testosterone, often called hypogonadism or low T. Many TRT providers in Florida use 350 ng/dL as a clinical threshold for considering testosterone replacement therapy.

Total testosterone serves as the standard first-line screening test because it is inexpensive, widely available, and clinically reliable. It provides the initial answer to whether low testosterone is present. When results fall in the borderline range (300-400 ng/dL), doctors may order additional tests such as free testosterone or bioavailable testosterone to refine the diagnosis. Morning blood draws are preferred since testosterone levels naturally peak in early hours, giving the most accurate baseline reading.

If you need a lab that specializes in testosterone testing, fast-turnaround diagnostic providers in Florida offer convenient draws and same-day or next-day results to support your initial evaluation.