What is normal testosterone? Here we go through values, symptoms and how testosterone is interpreted

What is a normal testosterone value?

Many search for the answer to the question "what is normal testosterone?" after feeling more tired than usual, noticing a decreased sex drive, slower recovery after exercise, or a general feeling that the body isn't functioning quite like it used to. At the same time, the answer is more nuanced than a single number on a lab report. Normal testosterone is not just about being "within the reference range," but also about when the test is taken, what symptoms are present, and how the result is interpreted alongside other hormones. Current guidelines emphasize that low testosterone levels in men should be assessed based on both symptoms and repeated morning samples, not from a single value.

What is meant by a normal testosterone value?

Testosterone is a sex hormone found in both men and women, but at different levels and with partly different functions. In men, it is primarily produced in the testes and influences everything from:

• sex drive
• erectile function
• sperm production
• muscle mass and strength
• bone density
• energy and well-being

The hormone is also produced in women, but in smaller amounts in the ovaries and adrenal glands. There, testosterone contributes to sexual function, energy, and general hormonal balance. Reference levels are therefore significantly lower in women than they are in men.

When speaking of "normal" testosterone, one usually refers to total testosterone in the blood . In adult men, a laboratory range is often given around 10–35 nmol/L. In adult women, levels are significantly lower, often around 0.3–2.0 nmol/L. Exact reference ranges vary between laboratories and analytical methods.

Reference intervals according to Swedish laboratories

Reference intervals for testosterone may differ slightly between different laboratories, but typical Swedish reference values ​​are given in nmol/L and are age and gender dependent:

Men

• 21–49 years: approximately 8.3–30 nmol/L
• ≥ 50 years: approximately 7.7–25 nmol/L

Women

• 21–49 years: approximately 0.48–1.9 nmol/L
• ≥ 50 years: approximately 0.43–1.2 nmol/L

Some laboratories also state similar intervals where:

• men <50 years: approximately 6.9–23 nmol/L
• premenopausal women: approximately 0.3–1.2 nmol/L

The most important thing to keep in mind when interpreting values is that a "normal" testosterone value is always laboratory-dependent and must be interpreted in context. A value that is normal at one laboratory may be assessed differently at another, especially at low levels or in women where the measurement is more technically sensitive.

What is normal testosterone in men – and when is it considered low?

In men, it is not enough to simply see a value just below or just above a limit. International guidelines recommend that a diagnosis of testosterone deficiency , or hypogonadism, only be made if there are:

1. symptoms or clinical signs suggestive of testosterone deficiency, and
2. repeated low testosterone values in morning samples.

Testosterone is normally at its highest in the morning and varies throughout the day. Therefore, the test should usually be taken early, often between 7 AM and 10 AM, preferably while fasting or at least under standardized conditions. If the first test is low, it should be repeated.

In practice, these interpretation levels are often used for men:

• Below approximately 8 nmol/L: clearly low and strongly suggestive of testosterone deficiency, especially in the presence of symptoms.
• Approximately 8–12 nmol/L: a gray zone where symptoms, SHBG , free testosterone , and other hormones become extra important.
• Above approximately 12 nmol/L: classic testosterone deficiency is less likely, although individual assessment is still needed.

These ranges do not mean that every man with, for example, 11 nmol/L feels unwell, or that everyone with 13 nmol/L automatically feels fine. Two people with the same total testosterone can have completely different symptoms depending on, among other things, SHBG, which is a transport protein that binds testosterone in the blood. If SHBG is high, the biologically available portion of testosterone may be lower than what the total value initially suggests. Therefore, a doctor may sometimes need to assess free testosterone or calculate it based on total testosterone, SHBG, and albumin.

Common symptoms that may raise suspicion of low testosterone in men include:

• decreased sex drive
• erectile dysfunction
• fatigue and low energy
• low mood or decreased drive
• decreased muscle mass
• increased fat mass, especially abdominal fat
• osteoporosis or decreased bone density
• impaired fertility

However, the symptoms are non-specific. Fatigue, low libido, and decreased stamina can also be due to stress, lack of sleep, depression, obesity, alcohol, medication, thyroid disorders, or chronic illness. Therefore, a comprehensive medical assessment is necessary.

What is normal testosterone in women?

Testosterone is not only relevant for men. Women also have testosterone, but the levels are much lower. However, there is greater measurement uncertainty in the low levels common in women, and therefore interpretation is often more complicated. Several sources emphasize that the analysis method is of great importance, especially within female reference ranges.

In adult women, an approximate normal range of approximately 0.3–1.3 nmol/L is often given, but reference ranges differ between laboratories. In women of childbearing age, levels can also be affected by the menstrual cycle, hormonal contraceptives, PCOS, body weight, and menopause.

A testosterone test in women is most often relevant when elevated androgen levels are suspected; symptoms that may indicate this include:

• increased hair growth in a male pattern
• acne
• irregular periods
• fertility problems
• suspicion of PCOS

Low testosterone in women is more difficult to interpret and is not as easily used as a sole explanation for symptoms like fatigue or low sex drive. A broader hormonal and medical assessment is required in those cases.

Why can testosterone be low even if you are otherwise healthy?

A low testosterone level does not always mean that the testes or the hormonal axis are permanently damaged. Testosterone can drop temporarily or functionally for several reasons. This is important, as the correct course of action is sometimes to treat the underlying cause rather than providing testosterone treatment directly.

Common causes of low levels include:

• obesity and abdominal fat
• type 2 diabetes or metabolic syndrome
• sleep apnea
• chronic illness or infection
• stress, malnutrition, or heavy overtraining
• certain medications, such as opioids or cortisone
• diseases of the pituitary gland or testes
• high alcohol consumption
• anabolic steroids or previous hormone use

There is also a natural age-related decline. Testosterone often drops gradually with increasing age, but age itself is not the same as pathological testosterone deficiency. Therefore, one should not treat a number—one should assess the following three things together: the person, the symptoms, and the cause.

A common patient scenario is the man who exercises regularly but despite this feels unusually tired, has lower libido, and has gained abdominal weight. If he also has obesity, snoring, and perhaps elevated blood sugar , low testosterone may be part of a larger metabolic picture. In such cases, weight loss, better sleep, and treatment of sleep apnea can sometimes improve levels.

When should you test testosterone – and what else should be measured?

It is not meaningful to test testosterone randomly without reason. Guidelines advise against general screening of asymptomatic men. However, testing is reasonable in the presence of clear symptoms or when there are medical reasons to investigate hormonal function.

Testing may be particularly relevant if you have:

• long-term decreased sex drive
• erection problems
• unexplained fatigue
• decreased muscle mass or strength
• infertility or low sperm quality
• osteoporosis at an unusually early age
• marked obesity, type 2 diabetes, or metabolic syndrome in combination with symptoms

If testosterone is low or in the gray zone, more tests are often needed to understand the cause. Common complementary analyses include:

• LH and FSH – show if the problem lies in the testes or higher up in the hormonal control center
• SHBG – helps interpret total testosterone
• albumin – sometimes used for calculating free testosterone
• prolactin – can be elevated in cases of pituitary involvement
• TSH and sometimes free T4 – to rule out thyroid disorders
• blood sugar / HbA1c and blood lipids – since testosterone deficiency often coexists with metabolic issues

It is also important to know that testosterone treatment is not suitable for everyone. Men planning fertility in the near future should be particularly cautious, as testosterone treatment can inhibit the body's own sperm production. Guidelines also recommend caution or advise against treatment in certain conditions, such as prostate cancer, breast cancer, and certain other risk situations.

Knowing what constitutes normal testosterone is therefore not about chasing an "optimal" value from social media. It is about getting a medically correct answer to your specific symptoms and situation.

Do you want to know what your values look like? Order a health check at Testmottagningen and get a comprehensive insight into your values and your testosterone levels (included in the health check for men). If necessary, you can also supplement with relevant hormones and other tests for a more complete picture of your health.