A normal total testosterone level for an adult woman falls between 15 and 70 ng/dL. That range is roughly one-tenth of what’s typical for men, which means even small shifts can produce noticeable symptoms. Where you land within that range depends on your age, where you are in your menstrual cycle, and even what time of day your blood is drawn.
Total Testosterone Reference Range
The standard reference range for total testosterone in women is 15 to 70 ng/dL. Most premenopausal women produce about 300 micrograms of testosterone per day, spread across three sources: the ovaries, the adrenal glands, and conversion from other hormones in fat and skin tissue. Unlike estrogen, which drops sharply at menopause, testosterone declines gradually starting in a woman’s late twenties and continues falling through midlife. After menopause, or after surgical removal of both ovaries, levels often settle well below 30 ng/dL.
Your total testosterone number captures all the testosterone circulating in your blood, both the portion bound to proteins and the small fraction floating freely. That free portion is what your body can actually use, which is why some providers also order a free testosterone test or calculate something called the free androgen index, a ratio of total testosterone to a binding protein called SHBG.
Why the Number Fluctuates
Testosterone follows a daily rhythm. Levels peak in the morning between 7:00 and 10:00 a.m., dip to their lowest point in the evening, then begin climbing again overnight. Current recommendations call for a blood draw between 8:00 and 9:00 a.m. to get the most reliable snapshot. A sample taken in the afternoon could read meaningfully lower than one taken first thing in the morning, which matters when you’re trying to figure out whether your level is genuinely low or just poorly timed.
Your menstrual cycle adds another layer of variation. Testosterone tends to be slightly higher around ovulation (mid-cycle) and lower during menstruation. Hormonal birth control also affects results because many oral contraceptives raise SHBG, the protein that binds testosterone and keeps it inactive. That means your total testosterone might look normal on paper while the amount your body can use is actually suppressed.
How Testing Works
Not all testosterone tests are equally reliable at the low concentrations found in women. The gold standard is a method called liquid chromatography-tandem mass spectrometry (LC-MS/MS), which produces accurate measurements even at very low levels. Older immunoassay-based tests were designed for the much higher testosterone concentrations in men and can be imprecise in the female range. Clinical guidance from the Association for Diagnostics and Laboratory Medicine is direct: do not use immunoassay-based testosterone tests on women and children. If your lab results come back on an immunoassay panel, the number may not reflect your actual level.
When you get results, ask your provider which method the lab used. If it was an immunoassay, a retest using LC-MS/MS may give a more trustworthy reading.
Signs of High Testosterone
When testosterone climbs above the normal range, the physical effects tend to be visible. Excess body and facial hair growth (particularly on the chin, upper lip, chest, and abdomen), persistent acne along the jawline, and thinning hair on the scalp are the hallmark signs. Periods may become irregular or stop altogether, and fertility can be affected.
The most common cause of elevated testosterone in women is polycystic ovary syndrome (PCOS). In PCOS, both total and free testosterone are often mildly elevated, along with related hormones like androstenedione and DHEAS. Mildly elevated levels point toward PCOS as the likely explanation, but highly elevated total testosterone, well above the reference range, can signal something more serious like an ovarian or adrenal tumor and warrants prompt evaluation.
Signs of Low Testosterone
Low testosterone in women is harder to pin down because there’s no universally agreed-upon cutoff for “too low.” The symptoms are also nonspecific, meaning they overlap with many other conditions. That said, a recognizable pattern exists. Common signs include low sex drive, persistent fatigue, loss of muscle tone and strength, vaginal dryness, difficulty sleeping, thinning hair, dry or brittle skin, and mood changes like depression or anxiety. Some women also experience trouble conceiving or irregular cycles.
These symptoms tend to appear gradually, which makes them easy to dismiss as normal aging or stress. Women who have had both ovaries removed experience a sharper drop and often notice the effects more acutely. If your levels fall below 15 ng/dL and you’re experiencing several of these symptoms, that combination gives your provider a clearer clinical picture than either the number or the symptoms alone.
What Affects Your Baseline Level
Several factors influence where your testosterone naturally sits within the 15 to 70 ng/dL range:
- Age: Levels peak in the early twenties and decline roughly 1 to 2 percent per year after that. By the time you reach your forties, your testosterone may be half of what it was at twenty.
- Body composition: Fat tissue converts testosterone into estrogen, so higher body fat percentages can lower circulating testosterone while raising estrogen.
- Hormonal contraceptives: Pills, patches, and rings that contain estrogen increase SHBG, which binds testosterone and reduces the amount available to your cells.
- Adrenal function: About half of a woman’s testosterone comes from the adrenal glands or from conversion of adrenal hormones. Conditions that affect adrenal output, including chronic stress and adrenal insufficiency, shift testosterone levels.
- Surgical menopause: Removing both ovaries eliminates one of the main production sites and can drop testosterone below 30 ng/dL almost immediately.
Getting an Accurate Result
If you’re planning to have your testosterone checked, a few practical steps improve the accuracy of your results. Schedule the blood draw for early morning, ideally between 8:00 and 9:00 a.m. If you’re still menstruating and the test isn’t urgent, drawing blood in the first few days of your cycle (during your period) gives a more stable baseline, since mid-cycle spikes around ovulation can inflate the number. Confirm that the lab uses LC-MS/MS rather than immunoassay. And ask for both total testosterone and SHBG so your provider can assess how much of that testosterone is actually available to your tissues.
A single reading outside the reference range doesn’t always mean something is wrong. Testosterone varies enough day to day that a borderline result often warrants a repeat test before drawing conclusions. The number means the most when it’s paired with your symptoms, your medical history, and an understanding of what “normal” looks like at your particular stage of life.