Test library
Testosterone Blood Test
A testosterone test measures the level of testosterone in the blood. It is used to evaluate hormone disorders caused by too little or too much testosterone and to help assess symptoms such as low energy, low libido, or mood changes.
Order Testosterone Testing
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Testosterone Testing- Typical turnaround
- 1-3 business days
- Starting price
- From $199
- Results
- Confidential, online
Quick answer
The testosterone test measures the amount of testosterone in the blood. Testosterone is a sex hormone that plays roles in muscle mass, bone strength, mood, libido, and reproduction in both men and women. Ordering the test can help evaluate symptoms or conditions linked to low or high levels, and results are interpreted by a qualified healthcare provider.
What this test measures
Testosterone is produced mainly in the testes in men and in the ovaries and adrenal glands in women. Levels follow a daily rhythm and tend to decline gradually with age. Measuring the hormone gives an objective look at a value that can be affected by sleep, stress, illness, and the time of collection, so context matters when the result is reviewed.
The test uses a blood sample, typically drawn in the morning when testosterone is at its highest. Several measurements may be needed because a single result can vary. The laboratory reports the total testosterone level and compares it with a reference range adjusted for age and sex. Additional forms such as free testosterone can be added when a more detailed view is needed.
Clinicians order testosterone testing to investigate symptoms such as low energy, reduced libido, erectile changes, mood shifts, or unexplained weight and muscle changes. It may also be used to follow a known hormone condition or to monitor the effect of treatment. Results are not a diagnosis by themselves and should be discussed with a healthcare provider.
- Total testosterone
- Free testosterone (when included)
- Sex hormone-binding globulin (SHBG)
- Luteinizing hormone (LH)
- Follicle-stimulating hormone (FSH)
- Estradiol
- Prolactin
- Albumin
- Bioavailable testosterone (calculated)
Why people order this test
- Evaluate symptoms of low testosterone
- Investigate signs of excess testosterone
- Assess delayed or early puberty with a provider
- Monitor an existing hormone condition
- Follow up on fertility concerns
- Check hormone levels before or during treatment
How to prepare
Testosterone levels are highest in the morning, so collection is usually done early in the day. Fasting may be requested if the test is bundled with other panels. Follow the timing instructions provided by the laboratory.
Understanding your results
Results are typically available within one to three business days. The report shows the testosterone level and its reference range, which differs by age and sex. Values outside the range may prompt repeat testing, and a qualified healthcare provider interprets the result in context.
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Frequently Asked Questions
What does a testosterone test measure?
It measures the amount of testosterone in the blood. Testosterone is a sex hormone involved in muscle, bone, mood, libido, and reproduction.
When should the sample be collected?
Because testosterone varies through the day, collection is usually done in the morning when levels are highest.
Why might the test be repeated?
A single measurement can be affected by sleep, stress, illness, and timing, so a provider may repeat the test to confirm a value.
Does the test require fasting?
Fasting is not always required, but it may be requested when testosterone is ordered with other tests. Follow the laboratory's instructions.
Can medications affect testosterone levels?
Yes. Some medications and supplements can change testosterone levels, so sharing a medication list with the ordering provider helps interpretation.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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Every page on this site is reviewed for clarity, sourcing, and accuracy. We update our library as testing options, collection networks, and accreditation standards change.