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You got your blood test back and your total testosterone is 410 ng/dL. Is that normal? What about 290, or 650? And does the answer change if you’re 35 or 62? Normal testosterone levels by age are less straightforward than most charts suggest, because labs use different ranges and a number on its own doesn’t diagnose anything. This guide explains the commonly used normal ranges for adult men in ng/dL and nmol/L, how testosterone changes with age, what counts as low, how to test properly, and when a low result actually matters.
Quick answer: For most healthy adult men, total testosterone between about 300 and 1,000 ng/dL (roughly 10 to 35 nmol/L) is considered normal, though lab ranges differ. Levels drift down gradually with age, and a lower number alone doesn’t mean you have a problem. Doctors diagnose low testosterone only when symptoms are present and repeated morning blood tests are consistently low.
What Is a Normal Testosterone Level in Men?
Testosterone is the main male sex hormone. It’s produced mostly in the testes and regulated by the brain through the hypothalamic-pituitary-gonadal axis, using luteinizing hormone (LH) as the signal. It supports muscle, bone, red blood cell production, mood, energy, and sex drive.
There is no single universal “normal.” That said, one of the most widely used references comes from the Traverse reference-range study, which harmonized data from several large studies. In healthy, non-obese men aged 19 to 39, total testosterone fell between roughly 264 and 916 ng/dL (9.2 to 31.8 nmol/L) for the middle 95% of men. The Endocrine Society refers to this work, and many US laboratories now print similar ranges.
Many other labs and websites quote 300 to 1,000 ng/dL as the typical adult range. The difference between sources is mostly about which population was studied and which test method was used.
Units: ng/dL, nmol/L, and ng/mL
Lab reports differ by country, which causes a lot of confusion.
- United States: usually ng/dL
- UK, Canada, Australia, much of Europe: usually nmol/L
- Some labs in South Asia and elsewhere: ng/mL or ng/dL
To convert, multiply ng/dL by 0.0347 to get nmol/L. To convert ng/mL to ng/dL, multiply by 100.
Testosterone Levels Chart: Reference Points in ng/dL and nmol/L
Use this as a conversion guide and reference, not a diagnosis. Always compare your result with the range printed on your own lab report.
|
ng/dL |
nmol/L |
What it generally means |
|---|---|---|
|
Below 231 |
Below 8 |
Low in European guidelines; likely to be treated as low if symptoms are present |
|
231 to 300 |
8 to 10.4 |
Low or borderline; repeat testing and further work-up are usual |
|
264 |
9.2 |
Lower limit of the commonly used healthy reference range |
|
300 |
10.4 |
Cut-off used by the American Urological Association |
|
300 to 350 |
10.4 to 12 |
Borderline or “gray zone”; doctors consider symptoms, free testosterone, and SHBG |
|
350 to 1,000 |
12 to 35 |
Within the typical normal range |
|
Above 916 to 1,000 |
Above 31.8 to 35 |
Upper end of the normal range |
Different guidelines draw the line in slightly different places. That’s normal, and it’s why your doctor looks at symptoms and repeat tests, not one number.
Normal Testosterone Levels by Age
Testosterone peaks in the late teens and twenties, then slowly declines. Studies have reported declines ranging from under 1% to about 2% a year in total testosterone, with free testosterone often falling faster. A figure of roughly 1% a year from middle age is commonly cited, but individual men vary widely.
Most labs apply one adult reference range to all men, so there’s no official “normal level” for each decade. Instead, here’s what typically happens:
|
Age group |
What usually happens |
What to know |
|---|---|---|
|
Teens to 30s |
Peak levels; most men sit in the middle to upper part of the range |
The healthy reference range was largely set using this group |
|
40s |
Gradual decline may begin; most men remain within range |
Weight gain, poor sleep, and stress can lower levels more than age itself |
|
50s |
Total testosterone is often lower than in the 20s, and SHBG tends to rise |
Many men feel changes in energy, body composition, and libido |
|
60s |
Further gradual decline; more men fall near or below the lower limit |
Chronic conditions such as obesity and diabetes become important factors |
|
70s and older |
Lower average levels; low testosterone with symptoms is more common |
Still, many healthy older men have levels in the normal range |
About 2% of men aged 40 to 79 in a large European study met the criteria for late-onset hypogonadism, which requires both symptoms and low testosterone, and the rate rose with age. In other words, lower testosterone is common with age, but a true clinical deficiency is far less common.
What are normal testosterone levels for men over 50? The same laboratory range (about 264 or 300 to roughly 900 or 1,000 ng/dL) is usually applied. A 55-year-old at 380 ng/dL is generally within normal limits. If you also feel unwell, your doctor may look at free testosterone, repeat the test, and check other causes. For more on energy and vitality at this stage of life, see our guide to natural male vitality after 50.
Total vs. Free Testosterone vs. SHBG
Your report may list several measurements.
- Total testosterone: all the testosterone in your blood. This is the main screening test.
- Free testosterone: the small portion not bound to proteins and readily available to tissues. It’s often measured or calculated when total testosterone is borderline.
- SHBG (sex hormone-binding globulin): a protein that binds testosterone. SHBG tends to rise with age, which can lower free testosterone even if total testosterone looks acceptable. Obesity and diabetes tend to lower SHBG, which can make total testosterone appear lower.
- LH and FSH: pituitary hormones that help show whether a low result comes from the testes or from the brain’s signalling.
- Estradiol, prolactin, thyroid hormones: sometimes checked to rule out other causes.
Because free testosterone ranges vary a lot between labs and methods, use the range printed on your report and ask your doctor how to interpret it.
What Counts as Low Testosterone?
There is no single worldwide cut-off, but these are common reference points:
- The American Urological Association uses a total testosterone below about 300 ng/dL as a reasonable threshold for diagnosing low testosterone.
- The Endocrine Society guideline points to a lower limit of roughly 264 ng/dL from the healthy reference data, and recommends diagnosing deficiency only when symptoms are present and morning testosterone is repeatedly low.
- European guidelines generally treat below about 8 nmol/L (around 231 ng/dL) as clearly low and 8 to 12 nmol/L as a borderline range where other tests help decide.
Testing positive isn’t the same as having a disorder. The condition is usually called male hypogonadism, or late-onset hypogonadism in older men. It means low testosterone plus symptoms, with a cause considered and other conditions ruled out.
Symptoms that may point to low testosterone
|
Symptom |
Could also be caused by |
|---|---|
|
Low libido, fewer morning erections |
Stress, medications, relationship issues, vascular disease |
|
Erectile difficulties |
Diabetes, high blood pressure, heart disease |
|
Persistent fatigue and low energy |
Sleep apnea, thyroid problems, depression, anemia |
|
Reduced muscle mass and strength |
Inactivity, low protein, aging |
|
Increased body fat, especially around the waist |
Insulin resistance, diet, low activity |
|
Low mood, irritability, poor concentration |
Depression, poor sleep, chronic stress |
|
Hot flushes, or loss of body hair (less common) |
Underlying hormonal or pituitary conditions |
Because these symptoms overlap with so many other conditions, a hormone test alone can’t tell you the cause.
How to Get an Accurate Testosterone Test
Testosterone naturally changes through the day and from day to day. A badly timed or poorly prepared test is one of the most common reasons for a misleading result.
- Test in the morning, ideally between about 7 and 10 a.m., when levels are highest.
- Follow your lab’s fasting instructions. The Endocrine Society suggests a fasting sample, since eating can lower measured levels.
- Repeat a low result. Diagnosis generally requires at least two separate low morning measurements.
- Avoid testing during illness, after a very poor night of sleep, or after heavy drinking or extreme exercise.
- Tell your doctor about everything you take. Some medications, including opioids and glucocorticoids, can lower testosterone, and high-dose biotin supplements can interfere with certain lab tests.
- Ask for related tests, such as free testosterone, SHBG, LH, and FSH, and for thyroid function, blood sugar or HbA1c, vitamin D, and a full blood count if relevant.
Why Testosterone Can Be Low: It’s Not Just Age
Age is only one factor. Common contributors to lower testosterone include:
- Excess body fat, especially around the abdomen
- Type 2 diabetes and metabolic syndrome
- Poor or insufficient sleep and sleep apnea
- Chronic stress and high cortisol
- Heavy alcohol use
- Certain medications, such as opioids and long-term steroids
- Chronic illness, including liver, kidney, and heart disease
- Testicular or pituitary problems, injury, or genetic conditions
This matters because treating the underlying cause, such as weight, sleep apnea, or diabetes, can improve testosterone and overall health, sometimes without any hormone therapy.
What to Do With Your Result
|
Your situation |
Sensible next step |
|---|---|
|
Normal range, no symptoms |
No treatment needed. Keep healthy habits and recheck if symptoms appear |
|
Normal range, but you feel unwell |
Ask your doctor to look for other causes (sleep, thyroid, mood, anemia, diabetes) |
|
Borderline, with symptoms |
Repeat the morning test and add free testosterone, SHBG, and LH |
|
Low on two morning tests, with symptoms |
See a doctor or endocrinologist to find the cause and discuss options |
|
Very low, or with severe symptoms |
Prompt medical assessment, including pituitary and testicular causes |
Natural Ways to Support Healthy Testosterone Levels
Lifestyle changes can’t reverse every cause of low testosterone, but they matter for men at any age, and they improve energy and health at the same time.
- Lose excess body fat. Weight loss in men with overweight or obesity is one of the most effective natural ways to raise testosterone.
- Lift weights two to three times a week. Resistance training supports muscle, metabolism, and body composition.
- Prioritize sleep. Aim for 7 to 9 hours and get checked for sleep apnea if you snore heavily or wake unrefreshed.
- Manage stress. Chronic stress and high cortisol work against testosterone.
- Limit alcohol. Heavy drinking is linked to lower testosterone.
- Eat a balanced, Mediterranean-style diet. Include protein, healthy fats, vegetables, and zinc-, magnesium-, and vitamin D-rich foods. Very low-fat diets have been associated with lower levels.
Our couples and vitality guide also explains how sleep and stress affect desire and energy.
What about supplements?
Supplements such as zinc and vitamin D mainly help if you’re deficient. Herbal products like ashwagandha, fenugreek, and maca have limited or mixed evidence for testosterone, and most commercial “booster” blends have not been shown to produce large or reliable changes. Don’t use them as a substitute for testing or treatment, and tell your doctor about everything you take.
Disclosure: All Natural Energy sells Vitalitas supplements. You can read about the ingredients on our Ingredients page or see the Vitalitas For Men formula. These products are not intended to diagnose, treat, cure, or prevent any disease, and results vary from person to person.
When Is Testosterone Therapy Considered?
If a doctor confirms low testosterone with symptoms, testosterone replacement therapy (TRT) may be discussed. It’s available as gels, patches, injections, or pellets. It can improve sexual function, energy, and mood in some men, but the benefits are often modest and not guaranteed.
TRT also has risks and needs ongoing monitoring. It can raise red blood cell counts, affect fertility and sperm production, and interact with prostate and sleep apnea conditions. A large 2023 trial in men with low testosterone and cardiovascular risk (TRAVERSE) found no increase in major cardiac events over its follow-up period, but it did report more atrial fibrillation, acute kidney injury, and blood clots in the lungs among men on testosterone. This is a decision to make with a qualified clinician, not something to start from an online quiz or an unregulated product.
When Should You See a Doctor?
Make an appointment if you have:
- Persistent fatigue, low mood, or reduced motivation that doesn’t improve
- New or worsening low libido or erectile difficulties
- Loss of muscle, increased belly fat, or unexplained weight change
- Loud snoring or gasping during sleep
- A borderline or low testosterone result on a home test or lab report
- Symptoms of low testosterone along with infertility, testicular pain, or severe headaches or vision changes (seek prompt care)
If you’re concerned, a primary care doctor can order the right tests, and an endocrinologist or urologist can take over if needed.
Frequently Asked Questions
Conclusion
Normal testosterone levels by age aren’t a single fixed number. For most healthy adult men, total testosterone between about 300 and 1,000 ng/dL (roughly 10 to 35 nmol/L) is considered normal, with levels gradually declining as the years pass. What matters more than any one result is the full picture: your symptoms, repeat morning tests, free testosterone and SHBG, and other possible causes of how you feel. If your result is borderline or low, or you have persistent symptoms, talk to a healthcare provider before trying any supplement or treatment.
Explore more: Natural Male Vitality After 50 | Couples and Vitality | Our Ingredients | More wellness articles
Medical disclaimer: This article is for general information only and isn’t medical advice. Reference ranges vary between laboratories and guidelines, and test results should always be interpreted by a qualified healthcare professional alongside your symptoms and medical history. These statements have not been evaluated by the FDA or Health Canada, and products mentioned are not intended to diagnose, treat, cure, or prevent any disease.
Sources and further reading
- Travison TG et al., Harmonized reference ranges for circulating testosterone levels in men of four cohort studies in the United States and Europe, Journal of Clinical Endocrinology & Metabolism, 2017
- Bhasin S et al., Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline, 2018
- Mulhall JP et al., Evaluation and Management of Testosterone Deficiency: AUA Guideline, 2018
- Salonia A et al., European Association of Urology Guidelines on Sexual and Reproductive Health (male hypogonadism)
- Wu FCW et al., Identification of late-onset hypogonadism in middle-aged and elderly men (European Male Ageing Study), New England Journal of Medicine, 2010
- Lincoff AM et al., Cardiovascular Safety of Testosterone-Replacement Therapy (TRAVERSE trial), New England Journal of Medicine, 2023
- Harvard Health Publishing and Mayo Clinic: overviews of low testosterone and testosterone therapy
- National Institutes of Health, Office of Dietary Supplements: fact sheets on zinc, magnesium, and vitamin D