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Total Testosterone, SHBG

Free and Bioavailable Testosterone

Free and Bioavailable Testosterone

This test measures your free and bioavailable testosterone levels, which represent the active forms of testosterone available in your bloodstream. Active (unbound) testosterone plays an important role in supporting muscle development, mood balance, and libido.

This panel also measures Sex Hormone Binding Globulin (SHBG) alongside total testosterone, helping provide a more complete picture of how much testosterone is available for your body to use.

We recommend sharing your results with your healthcare provider. Together, you can review your results, discuss any concerns, and make informed decisions about your health and wellbeing.

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Frequently Asked Questions

Understand Our Tests

What does the Free and Bioavailable Testosterone test measure?

This test measures the free and bioavailable forms of testosterone in your blood. These are the active forms of the hormone that your body can actually use. Measuring these levels can provide a more precise understanding of how testosterone is functioning in the body.

How is this test different from a total testosterone test?

A total testosterone test measures all testosterone in the blood, including the portion bound to proteins. The Free and Bioavailable Testosterone test focuses on the testosterone that is not tightly bound and is available for the body to use. This can provide clearer insight into symptoms related to hormone imbalance.

What symptoms might lead someone to consider this test?

Symptoms that may be associated with testosterone imbalance include fatigue, decreased muscle mass, changes in weight, increased body fat, hair loss or abnormal hair growth, changes in sleep, difficulty concentrating, depression, and low libido or erectile dysfunction.

Why is free and bioavailable testosterone important for fertility?

Testosterone plays an important role in sperm production and libido. Measuring the active forms of testosterone can provide helpful information when evaluating reproductive health and fertility.

When is the best time to take this test?

Testosterone levels decline throughout the day, so it is recommended to take this test first thing in the morning to obtain the most accurate results.

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  • Purchase Test

    Place your order online. A medical professional will review your order. Expect to receive your kit in 2-3 days once we have completed your order.

  • Register Kit

    When you receive your kit, be sure to follow the included instructions to register. This ensures your sample is processed accurately and without delay.

  • Collect Your Sample

    Follow the instructions that came with your kit to collect your sample. Send your sample back to Unilab using the prepaid envelope.

  • Review Your Results

    For most tests, results are ready 3-4 days days from receiving your sample. You will receive a notification when your test results are ready.

Your Results

  • Self-administered blood collection 
  • Simple to use and painless
  • Blood samples sent and tested at Unilab Laboratory 
  • Results in 3-4 days