🩺 Medically Reviewed by: Edward Salko, D.O. |
🧪 Lab Partner: Labcorp
Also Known As
Total Testosterone Test, Serum Testosterone, Total T Test
What Is a Total Testosterone Blood Test?
A testosterone blood test measures the overall amount of testosterone circulating in a man’s bloodstream. Testosterone is the primary male sex hormone responsible for muscle mass, bone density, libido, energy levels, mood, and red blood cell production.
Testosterone levels naturally peak in early adulthood and decline approximately 1–2% per year after age 30. According to the American Urological Association, low testosterone affects an estimated 2–4 million men in the United States — yet the majority remain undiagnosed because symptoms develop gradually and are often attributed to aging or stress.
What Does the Total Testosterone Test Measure?
This test measures total testosterone — the combined amount of testosterone in your blood, including:
- Bound testosterone — attached to proteins like SHBG (sex hormone binding globulin) and albumin; not immediately available to tissues
- Free testosterone — the small unbound fraction that is biologically active
Total testosterone is the standard first-line test for evaluating testosterone status. If total testosterone is borderline or symptoms persist despite normal total levels, a Free and Total Testosterone test provides a more complete picture.
Normal Testosterone Reference Ranges for Men
| Age | Normal Range (ng/dL) |
|---|---|
| 18–29 | 400–1,080 |
| 30–39 | 350–1,000 |
| 40–49 | 300–950 |
| 50–59 | 280–900 |
| 60–69 | 250–850 |
| 70+ | 200–800 |
The general clinical threshold for low testosterone is below 300 ng/dL. Many men experience symptoms at levels below 400 ng/dL. Always interpret results alongside symptoms and clinical history.
Symptoms of Low Testosterone
- Persistent fatigue and low energy
- Decreased sex drive
- Erectile dysfunction
- Loss of muscle mass and strength
- Increased body fat, especially around the abdomen
- Mood changes — depression, irritability, lack of motivation
- Brain fog and difficulty concentrating
- Reduced bone density
- Decreased body and facial hair
- Poor sleep quality
What Causes Low Testosterone?
- Age-related decline — the most common cause after 30
- Hypogonadism — the testes produce insufficient testosterone
- Obesity — excess fat tissue converts testosterone to estrogen
- Chronic stress — elevated cortisol suppresses testosterone production
- Type 2 diabetes — strongly associated with low testosterone
- Sleep apnea — disrupts the overnight testosterone production cycle
- Certain medications — opioids, steroids, and some antidepressants
- Pituitary disorders — impaired signaling from the pituitary gland
Who Should Get a Total Testosterone Test?
- Men experiencing fatigue, low libido, or erectile dysfunction
- Men with unexplained loss of muscle mass or increased body fat
- Men over 40 wanting a baseline hormone evaluation
- Men with depression or mood changes not responding to treatment
- Men with type 2 diabetes or metabolic syndrome
- Men considering or currently on testosterone replacement therapy (TRT)
- Men with known or suspected hypogonadism
- Athletes monitoring hormone levels
Test Preparation
No fasting required. However, timing matters significantly.
Get tested in the morning: Testosterone levels are highest between 7–10 AM. Afternoon testing can show levels 20–30% lower than morning levels in the same person. Always test in the morning for the most accurate and clinically meaningful result.
Avoid intense exercise the day before your blood draw — heavy training can temporarily affect testosterone levels.
How Much Does a Testosterone Test Cost?
| Where You Get Tested | Typical Cost | Notes |
|---|---|---|
| Personalabs | $39–$59 | Physician order included |
| Doctor’s office visit + lab | $200–$400+ | Office copay + lab fees |
| Endocrinologist visit | $300–$600+ | Specialist fees apply |
| Hospital outpatient lab | $300–$700+ | Facility fees apply |
HSA and FSA eligible. Testosterone testing qualifies as a reimbursable medical expense.
How to Order Your Testosterone Test
Step 1: Order online — your physician-approved lab order is ready within 2–4 hours. Step 2: Find a lab near you using our Lab Locator. Step 3: Get your blood drawn before 10 AM for most accurate results. Step 4: Get results in your secure Personalabs account within 24–48 hours.
Frequently Asked Questions
Can I order a testosterone blood test without a doctor?
Yes — in most states. Personalabs provides a physician-approved lab order as part of your purchase, so you don’t need your own doctor’s referral. Our network physician approves your order within 2–4 hours. A small number of states restrict direct-to-consumer lab testing; contact us to confirm availability in your state.
What is the difference between free and total testosterone?
Total testosterone measures all testosterone in your blood — both the portion attached to proteins like SHBG and albumin, and the unbound portion. Free testosterone is the unbound portion that your body can actually use. It’s possible to have normal total testosterone but low free testosterone, which still produces symptoms of low T. Testing both gives a complete picture of how much testosterone is actually available to your cells.
What time of day should I get a testosterone blood test?
Testosterone levels are highest in the morning, typically between 7–10 AM, and can drop by 20–35% by afternoon. For the most accurate and meaningful result — especially if you’re checking for low T — schedule your blood draw first thing in the morning.
Do I need to fast before a testosterone blood test?
No fasting is required. You can eat and drink normally before your testosterone blood draw. If you’re combining this test with a lipid panel or glucose test on the same visit, those tests may require fasting — check the preparation instructions for each test.
What are symptoms of low testosterone in men?
Common symptoms include fatigue, reduced sex drive, difficulty building muscle, increased body fat particularly around the abdomen, mood changes, depression, brain fog, and reduced bone density. Testosterone levels naturally decline about 1–2% per year after age 30, so baseline testing in your 30s gives you a useful reference point as you age.
How often should I test testosterone if I'm on TRT?
Most providers monitoring testosterone replacement therapy recommend testing every 3–6 months once levels are stabilized, and more frequently when first starting or adjusting dosage. Personalabs makes it easy and affordable to stay on top of your levels between scheduled provider visits.
How long does it take to get testosterone blood test results?
Results are typically available in your Personalabs account within 24–48 hours of your blood draw.
Related: Top 5 Blood Tests for Men
