Getting your testosterone levels checked starts with a simple blood draw, either ordered by your primary care doctor or purchased directly from a lab. The most common test measures total testosterone, and the American Urological Association uses 300 ng/dL as the cutoff for low testosterone. Most men can have this ordered at a routine appointment, and results typically come back within a few days.
Who to Ask for the Test
Your primary care doctor can order a testosterone blood test. You don’t need a specialist for the initial screening. If your results come back low or borderline, your doctor may refer you to an endocrinologist (a hormone specialist) or a urologist for further evaluation and treatment planning.
If you’d rather skip the office visit, several lab companies let you order testosterone panels directly online. Labcorp’s OnDemand service, for example, offers a comprehensive testosterone test for $159 out of pocket. You order the test, visit a local draw site for the blood sample, and receive results electronically. Other direct-to-consumer lab services like Quest and independent telehealth platforms offer similar options at varying price points. When insurance covers the test (which it typically does when a doctor orders it for a medical reason), your cost may be significantly lower.
Symptoms That Justify Testing
Doctors are more likely to order the test if you’re experiencing specific symptoms associated with low testosterone. The most common are reduced sex drive, erectile problems, and fewer morning erections. But the symptom list extends well beyond sexual function:
- Physical: fatigue, loss of muscle mass, increased belly fat, reduced endurance, thinning body or facial hair
- Cognitive: poor concentration, depressed mood, irritability, low motivation, memory problems
- Other signs: sleep disturbances, reduced sense of well-being, decreased work performance
Many of these overlap with depression, poor sleep, or simply aging, which is exactly why a blood test is useful. It gives you an objective number instead of guessing.
When to Schedule the Blood Draw
Testosterone levels follow a daily rhythm, peaking in the early morning and dropping throughout the day. How much this matters depends on your age.
If you’re under 45, the timing is critical. Men younger than 40 can see a drop of roughly 200 ng/dL between an early morning draw and one later in the day. That’s enough to push a normal result into the “low” range or vice versa. For this group, guidelines recommend drawing blood between 7 and 9 a.m.
If you’re 45 or older, the daily fluctuation shrinks dramatically. Studies show men over 45 don’t have a clinically meaningful difference between morning and afternoon levels (the gap narrows to about 34 ng/dL in men over 70). For this age group, any blood draw before 2 p.m. is acceptable.
Fasting before the test is generally recommended, as eating can influence hormone-binding proteins in your blood. A morning draw after an overnight fast covers both the timing and fasting requirements in one step.
What the Test Actually Measures
There are three versions of the test, and which one you get matters.
A total testosterone test is the standard first step. It measures all the testosterone in your blood, both the small amount floating freely and the larger portion attached to carrier proteins. This is the number used for the 300 ng/dL diagnostic threshold.
A free testosterone test measures only the unbound testosterone that’s actively available for your body to use. About 2-3% of your testosterone circulates in this free form. This test is less common but becomes important when your total testosterone is borderline or when your doctor suspects a protein-binding issue is masking the true picture.
A bioavailable testosterone test captures free testosterone plus testosterone loosely bound to a protein called albumin (which your body can still access). This is the least commonly ordered of the three but can clarify ambiguous cases.
Most people start with total testosterone. Your doctor will add the other tests if the initial results don’t match your symptoms.
Why You’ll Need More Than One Test
A single low reading isn’t enough for a diagnosis. Testosterone levels fluctuate significantly from day to day in the same person, influenced by sleep, stress, illness, and other factors. The AUA requires at least two separate early morning blood draws showing levels consistently below 300 ng/dL before diagnosing testosterone deficiency.
If your first test comes back low, expect your doctor to schedule a repeat draw on a different day to confirm. If both results fall below 300 ng/dL alongside relevant symptoms, that’s when the conversation about causes and treatment begins. Your doctor will likely order additional bloodwork at that point, including hormone panels that help distinguish whether the problem originates in the testes or in the brain’s signaling to the testes.
At-Home Test Kits
Several companies sell saliva-based or finger-prick testosterone kits you can complete at home. These are convenient but come with trade-offs. Saliva tests measure only free testosterone and can be affected by contamination, time of day, and collection technique. Finger-prick blood spot tests are more reliable than saliva but still less precise than a standard venous blood draw at a lab.
An at-home kit can be a reasonable first step if you’re curious about your levels and want a general direction before committing to a doctor’s visit. But if the result suggests low testosterone, you’ll still need a confirmatory venous blood draw through a lab to get a diagnosis or start treatment. No doctor will prescribe testosterone replacement based on an at-home saliva test alone.
What to Do With Your Results
If your total testosterone comes back above 300 ng/dL and you still have symptoms, the cause is likely something other than low testosterone. Depression, sleep apnea, thyroid problems, and chronic stress all produce similar symptoms and are worth investigating.
If your results fall in the 200-300 ng/dL range, context matters. A 28-year-old at 280 ng/dL is in a very different situation than a 65-year-old at the same number. Your doctor will weigh your age, symptoms, and overall health before deciding whether treatment makes sense. A free testosterone test often gets added at this stage to see whether the testosterone your body can actually use is adequate.
Results below 200 ng/dL on two separate draws, combined with clear symptoms, point strongly toward testosterone deficiency. At that point, expect your provider to investigate the underlying cause before jumping to treatment, since conditions like pituitary tumors, medications (especially opioids), and obesity can all drive testosterone down and may be treatable on their own.