Testosterone is the main sex hormone in men and an important one in women, and “normal” depends heavily on sex, age, and time of day. In adult men, most labs list a total testosterone reference range of roughly 300 to 1,000 ng/dL, measured in the morning. In adult women, total testosterone is far lower, typically around 15 to 70 ng/dL, and levels in both sexes decline gradually with age.
What Testosterone Level Is Normal For Men And Women?
There is no single number that defines normal testosterone. What counts as normal depends on your sex, your age, the lab running the test, and the time of day the sample was drawn. That is why two people can have the same result and get different interpretations from their doctors.
For adult men, most clinical laboratories report a total testosterone reference range of about 300 to 1,000 ng/dL. For adult women, the typical range is much lower, roughly 15 to 70 ng/dL. These ranges come from population data, meaning they reflect the middle 95 percent of people tested, not necessarily the level that is ideal for any one person.
Testosterone in the blood exists in a few forms. Most of it is bound to proteins, mainly sex hormone-binding globulin (SHBG) and albumin. A small fraction, usually 1 to 2 percent, circulates unbound and is called free testosterone. Total testosterone measures everything together. Free testosterone measures only the unbound portion.
Why the reference range is not the whole story
A result inside the reference range does not automatically mean everything is fine, and a result just below it does not automatically mean something is wrong. Symptoms matter. So does the pattern over time. A single low reading in an otherwise healthy man may reflect poor sleep, recent illness, or a sample drawn in the afternoon rather than a true deficiency.
This is a key point that gets lost in online discussions: the reference range describes a statistical distribution, not a treatment threshold. Doctors use it as one input among several.
How Do Testosterone Levels Differ Between Men and Women?
Men produce testosterone mainly in the testes, while women produce smaller amounts in the ovaries and adrenal glands. This difference in production explains why the ranges do not overlap much.
In men, testosterone drives sperm production, muscle and bone maintenance, red blood cell production, sex drive, and mood regulation. In women, testosterone contributes to sex drive, bone health, and possibly mood, though its role is less fully understood because levels are so much lower.
| Group | Typical Total Testosterone |
|---|---|
| Adult men | About 300–1,000 ng/dL |
| Adult women | About 15–70 ng/dL |
These numbers come from standard laboratory reference ranges. Individual labs may set slightly different cutoffs based on their equipment and the population they serve, so a result should always be read against the range printed on your own lab report.
Does Testosterone Decline With Age?
Yes, in both sexes. In men, total testosterone tends to decline gradually after about age 30, on average by roughly 1 percent per year, though this varies widely between individuals. Some men maintain levels well into their 70s that would be considered normal for a younger man.
In women, testosterone levels also decline with age, particularly around menopause, though the drop is less well studied than the changes in estrogen and progesterone.
The age-related decline in men is sometimes called “late-onset hypogonadism” when it comes with symptoms. It is different from the sharp drop caused by surgery, injury, or certain medical conditions. Not every man with a lower number has symptoms, and not every man with symptoms has a low number.
What Causes Low Testosterone?
Low testosterone can have several causes, and identifying the right one matters because treatment differs.
- Primary hypogonadism: the testes themselves do not produce enough testosterone. Causes include injury, infection, certain genetic conditions, and some cancer treatments.
- Secondary hypogonadism: the pituitary gland or hypothalamus in the brain does not send the right signals to the testes. Causes include pituitary tumors, certain medications, and some chronic illnesses.
- Age-related decline: a gradual drop that may or may not cause symptoms.
- Lifestyle and health factors: obesity, severe stress, poor sleep, and some chronic diseases are associated with lower testosterone, though the relationship is complex and not always one-directional.
Obesity is worth highlighting because the relationship runs both ways. Excess body fat can lower testosterone, and low testosterone can contribute to fat accumulation. This makes it hard to say which came first in any individual case.
What Are the Symptoms of Low Testosterone?
In men, symptoms may include low sex drive, erectile difficulty, fatigue, loss of muscle mass, increased body fat, reduced bone density, and mood changes. These symptoms are not specific to low testosterone, which is why a blood test is needed before drawing conclusions.
In women, symptoms of low testosterone are less clearly defined. Some clinicians associate low levels with reduced sex drive and fatigue, but the evidence is limited and the topic remains debated among researchers.
In both sexes, symptoms alone are not enough to diagnose low testosterone. Many conditions, including thyroid disorders, depression, sleep apnea, and anemia, can produce similar complaints.
How Is Testosterone Tested?
Total testosterone is measured with a blood test. Because levels fluctuate throughout the day, the sample is usually drawn in the morning, often before 10 a.m., when testosterone tends to peak in men.
If the first result is low, most guidelines recommend repeating the test on a different day to confirm. A single low reading is not enough to establish a diagnosis.
Free testosterone may be measured or calculated when total testosterone is borderline or when a doctor suspects that SHBG levels are affecting the result. SHBG can be altered by age, liver disease, thyroid conditions, and certain medications.
Testing is not recommended for everyone. Guidelines generally suggest testing only when there are symptoms or a known condition that affects testosterone production.
When Is Treatment Considered?
Testosterone therapy is generally considered for men with confirmed low testosterone on repeat testing plus symptoms. It is not typically recommended for men with normal levels, even if they have symptoms that seem consistent with low testosterone.
For women, testosterone therapy is less established. Some clinicians prescribe it for low sex drive after menopause, but the evidence is limited and long-term safety data are sparse. No clinical guidelines currently exist for testosterone therapy in premenopausal women.
Testosterone therapy has real risks, including effects on red blood cell production, possible cardiovascular effects, and suppression of sperm production in men. Anyone considering it should discuss the risks and benefits with a doctor who can monitor levels and adjust as needed.
Lifestyle factors such as weight management, sleep, and treatment of underlying conditions can affect testosterone levels, but they are not a substitute for medical evaluation when symptoms are significant.
Frequently Asked Questions
What is a normal testosterone level for a man?
Most labs report a normal total testosterone range of about 300 to 1,000 ng/dL for adult men, measured in the morning. A single result should be confirmed with a repeat test before any diagnosis is made.
What is a normal testosterone level for a woman?
For adult women, total testosterone is typically around 15 to 70 ng/dL. Levels are much lower than in men, and the clinical significance of variations within this range is less well understood.
Can testosterone levels be too high?
Yes. High testosterone in men can occur with testosterone therapy or certain tumors, and may cause acne, mood changes, and increased red blood cell counts. In women, high levels can cause unwanted hair growth and menstrual changes.
Does low testosterone always need treatment?
No. Treatment is generally considered only when low levels are confirmed on repeat testing and symptoms are present. Many men with slightly low levels have no symptoms and do not need therapy.
