The most reliable way to check your testosterone is a simple blood test, typically drawn from a vein in your arm at a lab or clinic. Your doctor can order one, or you can purchase a test directly from companies like Labcorp OnDemand without a doctor’s visit (their comprehensive testosterone panel costs around $159). Either way, the blood draw itself takes a few minutes, and results usually come back within a few days.
Types of Testosterone Tests
Not all testosterone tests measure the same thing. Most of the testosterone in your blood is attached to proteins, which means your body can’t easily use it. Only a small fraction floats freely and is available to build muscle, maintain bone density, and support the other functions testosterone is known for. This distinction matters because someone with normal total testosterone could still have symptoms if their free testosterone is low.
There are three types of blood tests available:
- Total testosterone measures both the free and protein-bound forms combined. This is the most common test and the one doctors order first.
- Free testosterone measures only the unattached form your body can readily use. Doctors order this when total testosterone looks normal but symptoms persist.
- Bioavailable testosterone measures free testosterone plus the portion loosely bound to a protein called albumin (which your body can still partially access). This test is less commonly ordered but can help clarify borderline results.
For most people, a total testosterone test is the right starting point. If that number comes back borderline or doesn’t match your symptoms, your doctor may follow up with a free testosterone test to get a fuller picture.
How to Prepare for Accurate Results
Testosterone levels follow a daily rhythm, peaking in the early morning and dropping throughout the day. For this reason, blood draws are typically scheduled between 7 and 10 a.m. A test taken in the afternoon could read significantly lower and give you a misleadingly low number.
Your doctor may also ask you to fast for several hours beforehand, drinking only water. This isn’t always required, but fasting can improve the accuracy of related markers that are sometimes tested alongside testosterone.
One often-overlooked factor: biotin supplements. If you take a biotin (vitamin B7) supplement at doses of 5 mg or higher, commonly sold for hair and nail growth, it can directly interfere with the lab equipment used to process your sample. Depending on the type of test, biotin can produce falsely high or falsely low readings. Over-the-counter multivitamins with small amounts of biotin (up to 1 mg) don’t appear to cause problems, but if you’re taking a dedicated biotin supplement, stop it at least 8 hours before your blood draw. Mention it to whoever orders your test.
What Normal Levels Look Like
Reference ranges vary slightly between labs, but the general benchmarks for adults are well established. For males 18 and older, most major U.S. labs report a normal range of roughly 264 to 916 ng/dL. The American Urological Association narrows the “healthy” window to 450 to 600 ng/dL and defines low testosterone as anything below 300 ng/dL.
For premenopausal females, the typical range is 10 to 55 ng/dL. After menopause, that drops slightly to 7 to 40 ng/dL. Testosterone plays a role in energy, mood, and bone health for women too, though at much lower concentrations.
During puberty (ages 10 to 18), male levels swing dramatically, anywhere from 100 to 970 ng/dL, so a single test in a teenager is harder to interpret without context.
Keep in mind that your result is a snapshot of one morning. Testosterone fluctuates day to day based on sleep, stress, illness, and other factors. A single low reading doesn’t automatically mean something is wrong.
Why One Test Isn’t Enough for a Diagnosis
If your first test comes back low, expect to repeat it. The Endocrine Society’s clinical guidelines are explicit on this point: a diagnosis of low testosterone (hypogonadism) requires symptoms consistent with testosterone deficiency plus “unequivocally and consistently low” levels confirmed on a second morning fasting blood draw. One bad number isn’t sufficient. You could have slept poorly, been fighting off an infection, or simply caught a natural dip.
Doctors will also want to rule out other causes for your symptoms. Fatigue, low libido, and mood changes overlap with dozens of conditions, from thyroid problems to depression. A full workup often includes additional hormone panels to identify what’s actually driving the issue.
At-Home Test Kits
Several companies now sell at-home testosterone kits that use either a finger-prick blood sample or a saliva sample. These are convenient if you want a preliminary number before deciding whether to see a doctor.
Saliva tests have one theoretical advantage: they measure free, unbound hormones rather than the total amount in your bloodstream. Since saliva naturally contains only the bioavailable fraction, it can reflect what your body is actually using. Collection is also painless and stress-free, which removes the small cortisol spike some people experience from a needle draw.
The tradeoff is accuracy. Saliva-based hormone measurements require extremely sensitive assays, and improper collection (eating, drinking, or brushing your teeth too close to the sample) can throw off results. The concentrations being measured are tiny compared to blood levels, so even small errors get amplified.
Finger-prick blood kits are closer to a standard lab test but collect a much smaller sample, which can limit what’s measured. Most at-home kits are best treated as a screening tool. If the result suggests something is off, a full venous blood draw at a lab is the next step to confirm it.
Where to Get Tested
You have several options depending on your situation and budget:
- Through your doctor: Your primary care physician or an endocrinologist can order the test. Insurance typically covers it when there’s a clinical reason, such as symptoms of low testosterone or a related condition. You’ll go to a lab for the blood draw.
- Direct-to-consumer lab services: Companies like Labcorp OnDemand and Quest Diagnostics let you purchase a test online, visit a local lab for the draw, and receive results digitally. No doctor’s visit is needed upfront, though a licensed provider technically authorizes the order behind the scenes. Expect to pay $50 to $160 out of pocket depending on the panel.
- At-home kits: Companies like Everlywell and LetsGetChecked ship kits to your door. You collect the sample at home, mail it back, and get results online. Prices range from $50 to $100. Convenient for a first look, but less precise than a lab draw.
If cost is a concern and you don’t have insurance, direct-to-consumer lab orders are often cheaper than an office visit plus a lab order. You’ll still want a doctor to interpret the results, especially if they come back outside the normal range, but getting the number itself is straightforward and doesn’t require a referral.