Getting your testosterone levels checked starts with a simple blood test, usually ordered by your primary care doctor. The most common version is a total testosterone test, and the key to an accurate result is getting your blood drawn in the morning, when testosterone peaks. The whole process from appointment to results typically takes just a few days.
Start With Your Primary Care Doctor
You don’t need a specialist to get the ball rolling. Your regular doctor can order a testosterone blood test based on your symptoms or concerns. Common reasons people request testing include persistent fatigue, low sex drive, difficulty building muscle, mood changes, or erectile dysfunction. If your results come back low, your doctor may handle follow-up testing themselves or refer you to a specialist.
For ongoing management, an endocrinologist (a hormone specialist) is generally the best fit. Urologists also test and treat low testosterone in men, though some focus primarily on total testosterone and may be less interested in digging into free testosterone levels. If you feel your concerns aren’t being taken seriously by one type of specialist, it’s reasonable to ask for a referral to the other.
What the Blood Test Measures
Most of the testosterone in your blood is bound to proteins and essentially inactive. A small fraction floats freely and is available for your body to use. This distinction matters because the test your doctor orders depends on what they’re looking for.
- Total testosterone measures both bound and free testosterone combined. This is the standard first test and what most guidelines use for diagnosis.
- Free testosterone measures only the unattached, active form. Doctors order this when total testosterone looks normal but symptoms persist, or when they suspect a protein-binding issue is masking the real picture.
- Bioavailable testosterone measures free testosterone plus testosterone loosely bound to a protein called albumin. This test is less common but can help clarify borderline cases.
Your doctor will almost always start with total testosterone. If that result is borderline or doesn’t match your symptoms, free testosterone testing is the logical next step.
How to Prepare for Accurate Results
Testosterone follows a daily rhythm, peaking in the early morning and declining through the afternoon. For this reason, blood draws are typically scheduled between 7 and 10 a.m. An afternoon test could show a misleadingly low number simply because of normal daily fluctuation.
Fasting has traditionally been recommended before the test. Eating can temporarily suppress testosterone levels, and major clinical guidelines have suggested measuring testosterone in a fasted state. That said, at least one study found no significant difference between fasting and non-fasting testosterone levels in paired samples. Your doctor may still ask you to fast for several hours beforehand, especially if they’re running other bloodwork like glucose or cholesterol at the same time. Follow whatever instructions you’re given, but don’t panic if you forgot and had breakfast.
Certain medications can skew your results in either direction. Opioid painkillers, corticosteroids (like prednisone), and the heart medication digoxin can all push testosterone readings lower. On the other hand, some seizure medications and the acid reflux drug cimetidine can raise levels. If you’re on any of these, let your doctor know before testing so they can interpret your results in context.
What Happens at the Lab
The standard method is a venous blood draw, where a phlebotomist takes blood from a vein in your arm using a needle. This collects 10 to 20 milliliters (roughly two to four teaspoons), which gives the lab enough sample to run a full hormone panel, repeat the analysis if results are borderline, and maintain quality control.
The test itself takes a few minutes. Results are usually available within one to three business days, depending on the lab. Most doctors will schedule a follow-up appointment or call to review results with you.
At-Home Test Kits: Useful for Screening, Not Diagnosis
Several companies sell finger-prick testosterone kits you can use at home. These are convenient, but they come with real accuracy limitations. Research published in Clinical Chemistry found that capillary (finger-prick) samples show three to eight times more variability than venous blood draws for biomarkers including total testosterone. The smaller blood volume, the physical squeezing required to get enough drops, and the higher contamination risk all contribute to less reliable results.
There’s one situation where finger-prick kits are particularly problematic: if you use testosterone cream or gel. Any residue on your fingertips will artificially inflate the result, making it clinically meaningless. Venous collection is the only option for anyone using topical testosterone products.
If an at-home kit flags your testosterone as low, treat it as a screening result, not a diagnosis. You’ll need a standard venous blood draw to confirm before any treatment decisions are made.
Understanding Your Results
The American Urological Association uses 300 ng/dL as the cutoff below which total testosterone is considered low. Other major medical societies worldwide use thresholds ranging from 230 to 350 ng/dL, so the exact number your doctor uses may vary slightly. Context matters too. A reading of 310 ng/dL in a 30-year-old with significant symptoms tells a different story than the same number in a 65-year-old who feels fine.
One low reading isn’t enough for a diagnosis. Guidelines recommend measuring early morning testosterone on two separate occasions before concluding that levels are genuinely low. Testosterone fluctuates day to day, and a single test can be thrown off by poor sleep, illness, stress, or recent intense exercise. If your first result comes back low, expect your doctor to schedule a repeat test, usually a few weeks later, to confirm.
If both tests come back below the threshold and you have symptoms, your doctor will likely order additional bloodwork to figure out why. This often includes tests for luteinizing hormone (which tells the brain to signal testosterone production), prolactin, and thyroid function. These help distinguish whether the issue originates in the testes or in the brain’s hormonal signaling system, which determines the treatment approach.
Cost Without Insurance
If you have insurance, a testosterone test ordered by your doctor is usually covered, especially when there’s a documented medical reason. Out of pocket, costs vary widely. A basic total testosterone test through a direct-to-consumer lab service runs roughly $30 to $70. A comprehensive panel that includes free testosterone and related hormones costs more, around $159 through Labcorp’s self-pay option. Prices differ between labs, so it’s worth comparing if you’re paying cash. Walk-in lab services like Quest Diagnostics, Labcorp, and independent local labs all offer self-pay testosterone testing, sometimes without a doctor’s order.