Lab test
Testosterone Level Test - Deficiency, Low T
This blood test measures free testosterone, the small unbound fraction of testosterone that is biologically available to tissues.
- Typical price
- From $118
- Results
- 1-3 business days
- Preparation
- See preparation notes below
- Sample
- Blood draw or sample collection at a local center
About this test
This blood test measures free testosterone, the small unbound fraction of testosterone that is biologically available to tissues. Most testosterone in the blood is attached to proteins such as sex hormone binding globulin and albumin, and only the free portion can act directly on cells. Measuring free testosterone, rather than total testosterone alone, can be useful when binding proteins are abnormal or when symptoms suggest an androgen imbalance despite a normal total level. It is ordered to evaluate low testosterone, fertility concerns, and androgen-related symptoms in both men and women. Results are interpreted with age, sex, and other hormone tests.
What this test measures
- Free Testosterone (direct) The unbound, biologically active portion of testosterone measured directly.
Who this test may be right for
- Men with symptoms such as low libido, fatigue, or reduced muscle mass
- Women with excess hair growth, acne, or suspected androgen excess
- Individuals being evaluated for infertility
- People whose total testosterone result needs further clarification
Before your visit
- Morning collection is often preferred because testosterone peaks in the early morning; follow your provider's timing
- Report hormone or steroid medications, which can affect results
- Follow any additional instructions that come with your order
Understanding your results
Free testosterone is compared against sex- and age-specific reference ranges. A low value may be consistent with androgen deficiency, while a high value may point toward excess androgen production or medication effects. Because free testosterone depends on both total testosterone and binding proteins, it is usually interpreted with SHBG and total testosterone. A healthcare provider should assess the result alongside your symptoms and any further testing.
Order this test online
- Buy online in a few minutes - no doctor's visit needed for most tests.
- Sample collection at a patient service center near you.
- Results are typically ready within 1-3 business days.
- Secure, lab-reviewed results delivered to your account.
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Questions people ask
What is the difference between free and total testosterone?
Total testosterone includes all testosterone in the blood, both bound and unbound, while free testosterone measures only the unbound fraction that is available to tissues.
Why measure free testosterone if total testosterone is normal?
When binding proteins such as SHBG are abnormal, the free fraction can differ from what total testosterone suggests, which is why free testosterone may be measured.
Does the time of day affect free testosterone?
Yes. Testosterone tends to be higher in the morning, so collection timing is recorded and considered when results are interpreted.
Can this test be used for women?
Yes. Free testosterone can be measured in women when androgen excess is being evaluated, using female reference ranges.
What does the Testosterone Level Test - Deficiency, Low T measure?
This blood test measures levels of free testosterone, a human sex hormone, for overproduction or deficiency.
Do I need to fast before this test?
Follow the lab's instructions.
How long do results take?
Most Testosterone Level Test - Deficiency, Low T results are released in 1-3 business days. Specialty testing can take longer.
Is this test right for me?
This page is educational and not medical advice. Talk to a licensed healthcare provider about which tests fit your situation.
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