The most common reason for high testosterone in women is polycystic ovary syndrome (PCOS), which affects an estimated 10 to 13% of women of reproductive age, with up to 70% of cases going undiagnosed. But PCOS is far from the only explanation. Adrenal gland conditions, medications, and rarely tumors can all push testosterone above the normal range. Understanding what’s behind the elevation matters because the cause shapes both the symptoms and the treatment.
What’s Considered a Normal Level
For a premenopausal woman around age 30, a normal total testosterone level falls between roughly 15 and 46 ng/dL. Free testosterone, the portion your body can actually use, ranges from about 1.2 to 6.4 pg/mL. These numbers shift with age and with the phase of your menstrual cycle, so a single reading slightly outside the range isn’t always meaningful.
One important detail: the type of test matters. Standard immunoassay blood tests, the kind most labs run by default, lose accuracy at the lower concentrations typical in women (below 100 ng/dL). A more precise method called LC-MS/MS is now considered the gold standard for measuring female testosterone because it can distinguish testosterone from structurally similar hormones that immunoassays sometimes count by mistake. If your results seem inconsistent with your symptoms, it’s worth asking whether this more sensitive test was used.
PCOS: The Most Likely Cause
PCOS is responsible for the majority of high testosterone cases in premenopausal women. The mechanism centers on insulin. When your body becomes resistant to insulin, your pancreas compensates by producing more of it. That excess insulin doesn’t just affect blood sugar. It directly stimulates cells in the ovaries called theca cells to ramp up androgen production. Insulin also works together with luteinizing hormone (LH) to amplify this effect, creating a feedback loop that keeps testosterone elevated.
The hallmark symptoms are irregular or absent periods, acne, thinning hair on the scalp, and excess hair growth on the face, chest, or abdomen. Clinicians evaluate that hair growth using a standardized tool called the Ferriman-Gallwey scale, which scores hair density across 11 body areas from 0 to 4. A total score of 8 or higher out of a possible 36 is considered diagnostic for hirsutism. Many women with PCOS also carry excess weight around the midsection, though lean PCOS is common too.
Because insulin resistance is the driver in many cases, improving insulin sensitivity through weight loss, exercise, or medication can lower testosterone levels and restore regular ovulation. Not every woman with PCOS has insulin resistance, though. Some have elevated LH levels as the primary trigger, which requires a different approach.
Adrenal Gland Conditions
Your adrenal glands, which sit on top of your kidneys, also produce androgens. When something goes wrong there, testosterone can climb independently of the ovaries.
Non-classic congenital adrenal hyperplasia (NCCAH) is the most commonly overlooked adrenal cause. It’s a genetic condition where the adrenal glands lack a key enzyme needed to produce cortisol efficiently. To compensate, the glands work harder and overproduce androgen precursors as a byproduct. NCCAH often mimics PCOS so closely that the two are confused. The distinguishing test measures a hormone called 17-hydroxyprogesterone (17-OHP). A basal level above roughly 6 nmol/L warrants further testing with a stimulation test, and if 17-OHP rises above 30 nmol/L after stimulation, NCCAH is confirmed. Higher baseline 17-OHP, elevated androstenedione, and higher total testosterone are all independent predictors of NCCAH rather than PCOS.
Other adrenal conditions include Cushing’s syndrome, where the body produces too much cortisol, and adrenal tumors. A blood marker called DHEA-S helps distinguish adrenal from ovarian sources of excess testosterone. When DHEA-S exceeds 700 μg/dL, an adrenal tumor needs to be ruled out with imaging.
Tumors That Produce Androgens
Androgen-secreting tumors are rare but important to consider because they require prompt treatment. They can develop in the ovaries or adrenal glands and tend to produce dramatically high testosterone levels, typically above 150 ng/dL in premenopausal women or above 64 ng/dL in postmenopausal women. Some experts use a threshold of 200 ng/dL or higher, roughly 2.5 times the upper limit of normal, as the point where a tumor becomes the leading concern.
The key clinical clue is speed. Tumor-driven testosterone rises fast, over weeks to months rather than years. This rapid increase causes virilization: deepening voice, male-pattern hair loss, increased muscle mass, and enlargement of the clitoris. If you’ve noticed several of these changes developing quickly, that pattern is what prompts your doctor to order imaging, usually starting with a transvaginal ultrasound and potentially followed by an MRI or adrenal CT scan.
Medications and Supplements
Several external substances can raise testosterone levels, sometimes intentionally and sometimes as a side effect. DHEA supplements are among the most common culprits. DHEA is a precursor hormone that the body converts into testosterone and estrogen. Oral DHEA supplements can raise blood testosterone levels meaningfully, especially at higher doses. Interestingly, DHEA applied vaginally for vaginal dryness does not appear to increase testosterone in the blood, suggesting the effect stays local.
Testosterone therapy itself, prescribed in some countries for low libido after surgical menopause, is designed to raise levels to the high end of the premenopausal range. If your testosterone is elevated and you’re using any form of testosterone cream, gel, or pellet, the medication is the likely explanation. Certain progestins used in hormone therapy also have androgenic properties and can nudge testosterone upward. Tibolone, a synthetic hormone used in some countries for menopausal symptoms, has known androgenic activity.
Anabolic steroids, sometimes found in fitness supplements without clear labeling, are another source. If you’ve started a new supplement and your testosterone has risen, checking the ingredient list carefully is a reasonable first step.
How Intense Exercise Affects Testosterone
The relationship between exercise and female testosterone is more nuanced than you might expect. Extreme exercise combined with insufficient calorie intake doesn’t raise testosterone. It actually lowers it. When energy intake falls significantly below energy expenditure, the brain suppresses the reproductive axis, reducing pulsatile release of key signaling hormones. This results in lower levels of estrogen, progesterone, and testosterone, along with lost periods and weakened bones. This pattern, common in endurance and aesthetic sports, is driven by energy deficiency rather than exercise itself.
Moderate resistance training, on the other hand, can produce small, temporary spikes in testosterone after a workout. These fluctuations are normal and don’t indicate a hormonal disorder. If you’re an athlete with high testosterone and regular periods, PCOS or another underlying condition is still the more likely explanation than training alone.
What the Diagnostic Workup Looks Like
If your testosterone comes back high, expect a stepwise evaluation. The first round of blood work typically includes a pregnancy test (pregnancy can affect hormone levels), thyroid function, prolactin, FSH, and an early morning 17-hydroxyprogesterone to screen for NCCAH. DHEA-S helps determine whether the excess androgens are coming from your adrenal glands or ovaries.
If the testosterone level is very high or you’re showing signs of rapid virilization, imaging comes next. A transvaginal ultrasound is the first choice because it’s affordable and effective at spotting ovarian masses. If that’s negative, an MRI of the pelvis or CT of the adrenal glands may follow. In rare cases where imaging is inconclusive but testosterone remains severely elevated, vein sampling from the ovaries and adrenal glands can pinpoint which organ is overproducing.
For most women, the workup will lead back to PCOS or NCCAH. Both are manageable conditions. The distinction matters because the treatment strategies differ, and getting the right diagnosis means getting the right plan.