Testosterone (Total): Normal Range, What High & Low Levels Mean

A total testosterone test measures the combined amount of bound and free testosterone in your blood. Bound testosterone is attached to proteins and acts as a reserve, while free testosterone is the active form your body uses immediately. Together they give doctors a broad snapshot of your hormone status. Testosterone is the primary male sex hormone, but women have it too — in smaller amounts — and it contributes to muscle mass, bone density, libido, mood, and energy in both sexes. Think of total testosterone as a starting-point measurement that helps your doctor decide whether further investigation is needed. Always discuss what your specific result means with your healthcare provider.

Normal ranges differ by sex and age. For men aged 19 to 39, the expected range is 300 to 1,000 ng/dL. For men aged 40 to 59, it shifts to 241 to 827 ng/dL, reflecting a natural age-related decline. For women aged 19 to 49, the typical range is 15 to 70 ng/dL, and for women aged 50 and older it is 10 to 55 ng/dL. These figures come from Mayo Clinic Laboratories. Keep in mind that different labs may use slightly different reference ranges, so always check the range printed on your own report. Your healthcare provider is best placed to interpret whether your number is appropriate for your individual circumstances.

The most common cause of elevated testosterone in women is polycystic ovary syndrome, or PCOS — a hormonal condition that affects the ovaries. Other causes include congenital adrenal hyperplasia, which is an inherited condition affecting hormone-producing glands, and in rarer cases an adrenal or ovarian tumour. Obesity can also raise testosterone levels because fat tissue converts other hormones into androgens like testosterone. A high result on its own is not a diagnosis — it is a signal that prompts further investigation. Your healthcare provider will consider your full clinical picture, including any symptoms you are experiencing, before determining the likely cause and whether any action is needed.

Low testosterone in men is most commonly linked to hypogonadism — a condition where the testicles or the glands that signal them (the pituitary or hypothalamus) do not function properly. Natural ageing plays a role too, as levels tend to decline gradually after age 30. Other contributors include obesity, type 2 diabetes, chronic illness, opioid use, excess alcohol consumption, and withdrawal from anabolic steroids. In women, low testosterone can occur after menopause, with premature ovarian insufficiency, adrenal insufficiency, or following surgical removal of the ovaries. A low reading needs to be interpreted alongside your symptoms and health history, so talk with your healthcare provider about what your result means for you.

Symptoms depend on whether testosterone is high or low, and on your sex. Men with low testosterone often notice reduced sex drive, erectile dysfunction, fatigue, low mood or depression, loss of muscle strength, increased body fat, and reduced beard or body hair. Women with low testosterone may experience low libido, fatigue, mood changes, vaginal dryness, and reduced bone density. High testosterone in women can cause acne, excess facial or body hair (called hirsutism), irregular or absent periods, scalp hair thinning, and a deepened voice. High testosterone in men from external sources like steroid use may cause acne, oily skin, and testicular atrophy. Many of these symptoms overlap with other conditions, so discuss your specific result and any symptoms with your healthcare provider.

A single testosterone reading can be influenced by several factors — including the time of day blood was drawn, recent illness, sleep quality, body weight, and certain medications. Because of this natural variability, doctors often recommend a repeat test before making any clinical decisions based on an out-of-range result. If your result sits close to the boundary of the reference range and you have few or no symptoms, your provider may simply monitor the level over time. If your result is significantly outside the normal range and accompanies noticeable symptoms, further tests may be ordered to look for an underlying cause. The right next step depends on your full health picture, so bring your result to your healthcare provider for personalised guidance.