Normal testosterone levels for adult men fall between 193 and 824 ng/dL, according to Cleveland Clinic reference ranges. For women, levels are much lower, typically measured in single-digit picograms per milliliter of free testosterone. But these numbers only tell part of the story. Where you fall within that range depends on your age, the time of day your blood was drawn, and which lab processed the sample.
Normal Ranges for Men
The standard reference range for total testosterone in adult men ages 18 and older is 193 to 824 ng/dL. That’s a wide window, and most men cluster somewhere in the middle rather than at the extremes. Testosterone peaks in early adulthood and then drops by about 1% per year after age 30. So a 25-year-old near 700 ng/dL and a 55-year-old near 450 ng/dL could both be perfectly normal.
Free testosterone, the small fraction circulating in your blood without being bound to proteins, has its own separate range. For men 18 and older, normal free testosterone runs from 32 to 168 pg/mL. Free testosterone matters because it’s the portion your body can actually use. Some men have a total testosterone level that looks fine on paper but a low free testosterone level, which can still cause symptoms.
Normal Ranges for Women
Women produce testosterone too, just in far smaller amounts. Free testosterone ranges shift with age and hormonal status:
- Ages 18 to 30: 1 to 5 pg/mL
- Ages 31 to 40: 1 to 6 pg/mL
- Ages 41 to 50: 1 to 4 pg/mL
- Ages 51 and older: less than 3 pg/mL
In women, testosterone plays a role in bone density, muscle maintenance, and sex drive. Levels that are too high can signal conditions like polycystic ovary syndrome, while levels that are too low after menopause may contribute to fatigue and reduced libido.
Total vs. Free Testosterone
When you get a testosterone blood test, you’ll typically see two numbers: total testosterone and free testosterone. Total testosterone measures everything in your blood, including the large portion bound to a protein called sex hormone-binding globulin (SHBG). Free testosterone measures only the unbound fraction, which is calculated from a formula using your total testosterone and SHBG levels.
Both numbers matter. A man could have total testosterone of 400 ng/dL, which looks solidly mid-range, but if his SHBG is unusually high, most of that testosterone is locked up and unavailable. His free testosterone might come back low even though his total looks normal. This is why clinicians often order both tests together rather than relying on one alone.
Why Time of Day Matters
Testosterone follows a daily rhythm, peaking in the early morning and dropping as the day goes on. In men between 30 and 40, morning levels run 30 to 35% higher than levels measured in the mid to late afternoon. That gap narrows with age, shrinking to about 10% by age 70.
Because of this swing, the standard recommendation is to have your blood drawn between 8:00 and 9:00 a.m. A test done at 3:00 p.m. could return a number that looks low but simply reflects the normal afternoon dip. If your first result comes back borderline, expect your provider to order a second morning draw to confirm. A single low reading isn’t enough for a diagnosis.
Why Lab Ranges Vary
One frustrating reality: different labs can report different reference ranges for the same test. The numbers depend on the testing method, the equipment, and the population the lab used to establish its norms. A result of 280 ng/dL might be flagged as low by one lab and fall just inside the normal range at another.
The CDC runs a Hormone Standardization Program that works to improve accuracy across labs by providing reference materials and monitoring how well routine laboratory methods perform over time. This has helped reduce some of the variability, but differences still exist. Your provider will interpret your results using the specific reference range printed on your lab report, not a universal cutoff.
When Low Levels Actually Matter
A number below the reference range doesn’t automatically mean something is wrong. The Endocrine Society’s clinical guidelines require two things for a diagnosis of low testosterone (hypogonadism): consistently low levels on at least two separate morning blood draws, and symptoms that match.
Those symptoms in men can include:
- Reduced sex drive
- Difficulty getting or maintaining erections
- Loss of muscle size and strength
- Increased body fat
- Bone loss
- Fatigue or trouble concentrating
- Sleep problems
- Depression
Some men with numerically low testosterone feel completely fine, while others with levels in the low-normal range experience noticeable symptoms. The number is a starting point, not a verdict. Providers also screen for other conditions that mimic low testosterone, including thyroid disorders, medication side effects, and depression, before attributing symptoms to testosterone alone.
How Testosterone Changes With Age
The 1%-per-year decline after 30 is an average, not a guarantee. Some men maintain relatively stable levels into their 60s, while others experience steeper drops. Lifestyle factors accelerate or slow the decline. Obesity is one of the strongest predictors of lower testosterone at any age, because excess fat tissue converts testosterone into estrogen. Poor sleep, chronic stress, heavy alcohol use, and certain medications also push levels down.
The morning testosterone peak also flattens with age. Younger men see a pronounced rise and fall throughout the day, while older men produce testosterone at a more even, lower rate. This is why the timing of the blood draw becomes slightly less critical (though still recommended in the morning) for men over 65.
For women, testosterone declines gradually from the late 20s onward, with a more noticeable drop after menopause when the ovaries significantly reduce hormone production. Unlike in men, there’s no widely agreed-upon clinical threshold for “low testosterone” in women, which makes diagnosis more nuanced and symptom-driven.