A high testosterone level is generally any result above the upper end of the normal reference range for your sex and age. For adult men, that upper boundary typically falls between 800 and 1,000 ng/dL depending on the lab, while for adult women the normal range tops out around 40 ng/dL. Numbers above those ceilings can signal a medical condition, the use of external hormones, or sometimes just normal variation that needs a second look.
Normal Ranges for Men and Women
Testosterone is measured in nanograms per deciliter (ng/dL) through a blood test. In men, the normal range shifts downward with age. Between 40 and 49, a typical range is 252 to 916 ng/dL. By ages 50 to 59, the range narrows to 215 to 878 ng/dL. Men in their 60s fall between 196 and 859 ng/dL, and those in their 70s between 156 and 819 ng/dL. A result above the upper boundary for your age group is considered high.
For adult women (ages 18 and older), normal testosterone sits below 40 ng/dL. Even a modest rise above that threshold can produce noticeable symptoms because the female body is far more sensitive to small shifts in testosterone.
One important detail: reference ranges vary from lab to lab. The specific assay your lab uses, along with its calibration, determines the numbers printed on your report. Your result should always be interpreted against the range listed on that particular report, not a generic chart you found online.
Total vs. Free Testosterone
Most testosterone in the blood is bound to carrier proteins, primarily one called sex-hormone-binding globulin and another called albumin. Bound testosterone is essentially inactive. Only the unbound, or “free,” fraction is readily available for your body to use in building muscle, maintaining bone density, and supporting other functions.
A total testosterone test measures both bound and free forms together, and it’s the standard test ordered in most situations. A free testosterone test measures only the active, unattached form and is sometimes added when total testosterone looks normal but symptoms suggest otherwise. You can have a normal total level yet an elevated free level (or vice versa) depending on how much binding protein your body produces. That’s why a single number doesn’t always tell the full story.
Signs of High Testosterone in Men
When testosterone climbs well above the normal range in men, the symptoms tend to be widespread. Skin changes are common: persistent acne, oily skin, and fluid retention that causes swelling in the legs and feet. Physically, you may notice rapid increases in muscle mass, weight gain partly driven by a bigger appetite, and elevated blood pressure or cholesterol readings.
Reproductive effects are counterintuitive. Rather than boosting fertility, excess testosterone can shrink the testicles, lower sperm counts, and cause erectile problems. The body interprets the high signal as a cue to shut down its own production, which disrupts the hormonal feedback loop that keeps sperm development on track.
Mood and behavior changes round out the picture. Irritability, mood swings, euphoria, impaired judgment, insomnia, and headaches have all been documented, though the link between high testosterone and outright aggression is less clear-cut than popular culture suggests.
Signs of High Testosterone in Women
In women, the effects of elevated testosterone are often visible and distressing. The most recognized sign is hirsutism, which is the growth of coarse, dark hair on the face, chest, abdomen, and back. Acne and persistently oily skin are also common. Over time, some women develop thinning hair on the scalp in a pattern similar to male baldness.
Menstrual cycles frequently become irregular or stop altogether, and fertility can drop significantly. At very high levels, women may notice a deepening voice and a reduction in breast size. Depression and anxiety often accompany these physical changes, partly from the hormonal disruption itself and partly from the emotional toll of the symptoms.
Common Causes
The most frequent cause of high testosterone in women is polycystic ovary syndrome (PCOS), a hormonal condition that affects an estimated 1 in 10 women of reproductive age. PCOS bundles elevated testosterone with irregular periods, reduced fertility, and often weight gain. Less common causes include tumors on the adrenal glands or ovaries that produce excess hormones.
In men, naturally high testosterone from a tumor (testicular or adrenal) is rare. The far more common scenario is exogenous testosterone, meaning it came from outside the body. Testosterone replacement therapy prescribed for low levels can overshoot the target, and anabolic steroid use pushes levels dramatically higher. A standard clinical dose of 600 mg per week has been shown to raise circulating testosterone to four to six times above natural production. Athletes and bodybuilders who misuse steroids at doses of 1,000 to 5,000 mg per week can reach levels 5 to 29 times higher than normal, well into what’s called the supraphysiological range.
Long-Term Health Risks
Sustained high testosterone, whether natural or from external sources, carries real cardiovascular consequences. A large genetic study published in eLife found that higher free testosterone was associated with a 17% increased risk of hypertension, even without changes in blood pressure readings on their own. The same analysis showed that higher testosterone lowered HDL cholesterol, the protective type, which over time raises the risk profile for heart disease.
Blood thickness is another concern. High testosterone stimulates the bone marrow to produce more red blood cells, increasing a measurement called hematocrit. The eLife study found a 1.37 percentage-point increase in hematocrit for each unit rise in genetically predicted testosterone. Thicker blood flows less easily and is more prone to clotting, which can lead to stroke or deep vein thrombosis.
For men using external testosterone, Harvard Health Publishing notes additional risks including prostate enlargement (which can make urination difficult), liver problems, and heart muscle damage with long-term abuse. Adolescents face the added danger of premature growth plate closure, which can permanently stunt height.
How Testosterone Is Tested
Testosterone levels fluctuate throughout the day, peaking in the early morning and dropping by the afternoon. For that reason, blood draws are typically scheduled in the morning to capture the most consistent reading. A single elevated result isn’t usually enough for a diagnosis. Most providers will repeat the test on a separate day to confirm the finding before investigating further.
If total testosterone comes back high, a free testosterone test or measurements of binding proteins may follow to clarify the picture. Depending on symptoms and suspected causes, additional bloodwork (including other hormones like DHEA, estrogen, or markers of adrenal function) may be ordered to pinpoint where the excess is coming from.