What Is a Normal Testosterone Level? Ranges by Age Explained

Disclosure: This page may contain affiliate or commercial relationships. | Last Updated: August 2026

MEDICAL DISCLAIMER This content is for informational purposes only and does not constitute medical advice. Consult a licensed physician before starting any hormone therapy or treatment.

Testosterone plays a role in sex drive, sperm production, muscle and bone health, red blood cell production, and other functions in the body. Levels also change throughout a man’s life, which can make a single test result difficult to interpret without context. 

If you have had a testosterone test and are wondering whether your number is too high, too low, or somewhere in the middle, the answer is not always straightforward. Age matters. So does the time of day the blood was drawn, the laboratory’s reference range, your symptoms, and your overall health. 

Here’s what to know about testosterone ranges and how doctors typically interpret them.

What Are Normal Testosterone Levels?

Testosterone is an androgen hormone produced primarily by the testicles in men. It contributes to sexual development and function, but its effects extend well beyond sex drive. Testosterone also supports muscle mass, bone strength, sperm production, and red blood cell production.

When people talk about normal testosterone levels, they are usually referring to total testosterone measured in the blood. Total testosterone includes testosterone that is attached to proteins in the bloodstream as well as the smaller amount that remains unbound.

Free testosterone is different. It refers to testosterone that is not attached to those proteins. In some situations, a doctor may order a free testosterone test or consider it when total testosterone does not tell the whole story. The appropriate test depends on the individual and the reason for testing.

There is no single number that applies to every man. Reference ranges can differ between laboratories because testing methods and reference populations vary. MedlinePlus, for example, lists a reference range of 249 to 836 ng/dL for males ages 17 to 50 and 193 to 740 ng/dL for males over 50 on its testosterone test reference page. Other laboratories may use different ranges.

That’s why a result should be read alongside the reference range printed on your own lab report.

A testosterone result can also change depending on when the sample is taken. Testosterone is generally higher in the morning and lower later in the day. Illness, poor nutrition, certain medications, and other factors can temporarily affect a result.

What can affect a testosterone reading?

Several factors can influence a test result, including:

• Time of day: Testosterone is generally highest in the morning.
• Age: Levels tend to decline gradually as men get older.
• Illness: Being acutely or seriously ill can affect testosterone production.
• Medications: Some medicines can influence testosterone levels.
• Body composition: Conditions such as obesity can affect hormone measurements and metabolism.
• Sleep and nutrition: Poor sleep and inadequate nutrition may contribute to temporary changes.
• Testing method: Different laboratories and assays can produce different reference ranges.

A single number is therefore only one piece of the picture.

Testosterone Levels by Age: What Changes Over Time?

Testosterone does tend to decline with age, but the change is gradual rather than a sudden drop at a particular birthday. The Endocrine Society notes that testosterone generally decreases as men age, with levels starting to decline around age 30.

That does not mean every man will have the same level at the same age. Two healthy men who are both 50 can have very different testosterone results and feel completely different.

Here is a practical way to think about testosterone levels by age:

Age group	What generally happens
20s	Testosterone is generally near its higher adult levels.
30s	A gradual decline may begin, although many men remain within a healthy adult range.
40s	Levels may continue to decrease. Symptoms, health history, and repeat testing become important when evaluating possible deficiency.
50s	Lower testosterone becomes more common, but age alone does not establish a diagnosis.
60s and beyond	Testosterone may be lower than in younger men. A persistently low result combined with symptoms may warrant further evaluation.

These are broad patterns, not diagnostic cutoffs. There is no rule stating that a 40-year-old man must have a certain testosterone level or that a 60-year-old man should automatically accept a lower result as normal.

The distinction matters because aging and testosterone deficiency are not interchangeable terms. In a 2026 statement, the Endocrine Society emphasized that diagnosing hypogonadism should focus on symptoms plus consistently low, accurately measured testosterone rather than assuming that low testosterone is simply a consequence of getting older.

What Is Considered a Low Testosterone Range?

Doctors do not diagnose testosterone deficiency from a number alone.

The American Urological Association uses a total testosterone level below 300 ng/dL as a reasonable cutoff to support a diagnosis, but it also recommends confirming the finding with at least two separate early-morning measurements. The Endocrine Society similarly recommends confirming low morning testosterone with repeat testing.

That means a result below 300 ng/dL should not automatically be interpreted as proof of hypogonadism.

The low testosterone range can be especially confusing when a result falls near the lower end of the laboratory’s reference range. A man may have a result that is technically within the lab’s range but still have symptoms that deserve evaluation. Another man may have a relatively low result without experiencing symptoms associated with testosterone deficiency.

Doctors also consider why testosterone may be low. Possible causes include problems involving the testicles or pituitary gland, certain chronic illnesses, some medications, significant weight changes, and other medical conditions.

This is why proper evaluation matters. If testosterone is repeatedly low, a healthcare professional may order additional tests to determine whether the issue originates in the testicles, pituitary gland, or another part of the hormone system.

Signs of low testosterone: What Should You Look For?

Signs of low testosterone can affect several areas of health. Some are easy to recognize, while others can be subtle.

Possible symptoms include:

• Reduced sex drive
• Erectile difficulties
• Infertility
• Decreased muscle mass
• Lower bone density
• Low energy
• Changes in mood
• Reduced body or facial hair
• Anemia without another obvious cause

These symptoms do not prove that testosterone is low. Fatigue, changes in mood, sleep problems, sexual difficulties, and changes in body composition can have many possible causes. The AUA specifically notes that symptoms associated with testosterone deficiency can be nonspecific and may occur with other health conditions.

For that reason, symptoms should prompt a conversation rather than a self-diagnosis.

If several symptoms persist, especially when they affect sexual function, energy, strength, or fertility, it may be reasonable to ask a healthcare professional whether testosterone testing is appropriate.

How Is Testosterone Tested?

Testosterone is measured through a blood test. For adult men being evaluated for possible deficiency, testing is generally performed in the morning because testosterone follows a daily pattern. MedlinePlus recommends a sample between 7 a.m. and 10 a.m., while the Endocrine Society similarly recommends early-morning testing.

One test may not be enough.

Testosterone can vary from day to day. A result that looks unexpectedly low may be higher when measured again under appropriate conditions. The Endocrine Society recommends repeating a morning fasting total testosterone measurement to confirm a low result.

Your healthcare provider may also ask about medications, existing health conditions, sleep, nutrition, and other factors that could affect the result.

Total vs. free testosterone

Total testosterone is the most common measurement. It includes testosterone that is bound to proteins as well as unbound testosterone.

Free testosterone measures the portion that is not bound to those proteins. It may provide additional information in certain situations, particularly when the total testosterone result does not clearly fit the person’s symptoms or clinical picture.

The important point is that testosterone testing is not a simple scorecard. Your doctor may need to look at several pieces of information before deciding what a result means.

What About Low T in Men Over 40?

The idea of low testosterone in men over 40 can make it seem like declining testosterone is simply a normal part of getting older. But that’s not always the case.

Testosterone generally decreases gradually with age, and the decline can begin during a man’s 30s or 40s. Still, the degree of change varies considerably between individuals.

A 45-year-old with low energy and reduced sex drive may need a different evaluation from a 45-year-old who feels well and happens to have a testosterone result near the bottom of the lab’s reference range.

Lifestyle and general health also deserve attention. Sleep, nutrition, body weight, physical activity, alcohol use, medications, and underlying medical conditions can all play a role in how a person feels and may influence testosterone levels.

If symptoms are persistent, testing can help determine whether testosterone is actually low. If it is, the next question is why.

When Is Testosterone Replacement Therapy Considered?

Testosterone replacement therapy, or TRT, is prescribed to replace testosterone in men who have clinically confirmed testosterone deficiency.

A doctor may consider TRT when a man has symptoms consistent with testosterone deficiency and repeatedly low testosterone results. The Endocrine Society recommends making the diagnosis only when both symptoms or signs and consistently low testosterone concentrations are present.

TRT can be delivered in several forms, including injections, gels, patches, and implants. The right option depends on the patient’s circumstances, preferences, medical history, and treatment goals.

Treatment also requires monitoring. A healthcare professional may track testosterone levels and other health measures during treatment. Fertility is another important consideration. Testosterone therapy can suppress sperm production, so men who are planning to have children in the near future should discuss this with their doctor before starting treatment.

TRT should therefore be approached as a medical treatment rather than something to start based on an isolated lab result.

What Does TRT Cost?

The price of testosterone therapy varies depending on the type of treatment, dosage, provider, laboratory testing, insurance coverage, and how frequently follow-up appointments are required.

A TRT cost guide can help someone understand the expenses involved, but the advertised medication price may not represent the full cost of care. A treatment plan may also involve consultations, blood tests, follow-up visits, and medication adjustments.

Insurance coverage varies, too. Some plans may cover certain forms of medically indicated testosterone therapy, while others may have specific requirements or exclusions.

When comparing treatment options, ask what the quoted price includes. Knowing the full cost of care can make it easier to compare options realistically.

When Should You Talk to a Doctor About Testosterone?

Consider talking with a healthcare professional if you have persistent symptoms that could be related to testosterone deficiency, particularly changes in sex drive, erectile function, fertility, muscle mass, or unexplained physical changes.

Testing may also be appropriate when your doctor suspects an underlying condition that could affect testosterone production.

The key is to avoid drawing conclusions from a single number. A testosterone result should be interpreted according to the laboratory’s reference range, the time of testing, your symptoms, and your medical history.

If a result is low, your doctor may repeat the test before deciding what it means. Additional testing may then help identify the underlying cause.

Understanding Your Testosterone Level in Context

There is no universal testosterone number that defines health for every man. Levels tend to decline gradually with age, but the change varies from person to person. Laboratory reference ranges vary as well.

If your test result seems lower than expected, look at the bigger picture. Was the sample taken in the morning? Was the result repeated? Are you experiencing symptoms? Does your result fall below your laboratory’s reference range? Could another health issue or medication be affecting the result?

Those questions provide much more useful information than age alone.

PrescribedRX can help you learn more about testosterone health, testing, and treatment options. If you are considering TRT or want to better understand your results, visit PrescribedRX to learn more about our services and the support available for your next step.

Ready to Talk to Someone? Talk to TRT specialist online, review your labs with a licensed provider, and get a plan built around your actual results rather than a guess. Consultations are private, and you decide what happens next. Start with PrescribedRX  |  Questions first? Contact PrescribedRX

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Related reading

More on testosterone therapy:

• TRT guide
• TRT vs testosterone boosters
• Testosterone cypionate vs enanthate
• Signs you need TRT over 40
• Low testosterone men
• Low testosterone men over 40
• Signs of low testosterone
• Foods that boost testosterone
• Exercises boost testosterone

Plans from PrescribedRX

PrescribedRX prescribes through clinicians licensed in your state. Plans in this category:

• Injectable Testosterone
• Testosterone Cream
• Enclomiphene

Every plan and its current price is on the plans page and the pricing page.

About This Guide

This article was written and reviewed in accordance with our editorial standards, drawing on professional urology guidance, peer-reviewed research, and public regulatory notices current as of July 2026. Clinical guidance and coverage policies change; verify anything time-sensitive with your provider or plan.
Disclosure: This page may contain affiliate or commercial relationships. We are not affiliated with any clinic or service discussed unless noted.

Last Updated: August 2026

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This article is for general information. It is not medical advice and it is not a recommendation for any particular treatment. Whether a treatment is appropriate for you is a decision for a licensed clinician who has reviewed your health history and current medications.