Bioavailable Testosterone


This test measures the proportion of testosterone that is unbound to sex hormone binding globulin (SHBG) and therefore available to the body's tissues.

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Bioavailable Testosterone

About this test

Bioavailable testosterone is the testosterone that is not bound to SHBG and can be used by the body. Most testosterone in the body is strongly bound to sex hormone binding globulin, while some of it is weakly bound to albumin and the remainder is free or unbound and therefore available to tissues. This test measures both the free testosterone and the testosterone that is bound to albumin. 

If you have high levels of testosterone but too much is bound to proteins and cannot be utilised by the body, you can still suffer from symptoms of low testosterone. 

The bioavailable testosterone test is generally recommended for men evaluating a condition known as andropause. Andropause is caused by a decrease in hormones with age, which plays a direct role in various physiological changes, including muscle strength, bone density and body composition.

Please ensure your sample is collected in the morning. If you are tracking your results over time then it is vital that you always have your blood taken at the same time.

View our Andropause Profile

How it works

Collect Sample

We send you an easy-to-use kit to collect your blood sample.

Post Sample

Post your sample to our lab in the prepaid envelope provided.

View Results

View results securely in your own personal dashboard.

Important Information

Our tests are not a substitute for seeing your doctor, especially if you are suffering symptoms. Our doctors will interpret your results based on the information you have provided, but will not diagnose, consult or provide any treatment. You will be advised to see your doctor for any necessary follow-up action.

Tests Included

Blood sample collection kit

We will send you your Bioavailable Testosterone blood sample collection kit together with the details of a convenient clinic where you can go and have your sample taken.

Postage & packaging

Your Bioavailable Testosterone includes 1st class postage and packaging for you to send your blood sample directly to our laboratory for analysis. If you live in an area where you cannot rely on the post or you simply want to ensure that your sample arrives at the laboratory the following day, you may wish to send your blood sample guaranteed next day delivery for extra reassurance.

Private laboratory analysis

Your blood sample will be analysed at one of our chosen laboratories. You can be assured of fast, accurate results from one of our accredited independent providers of clinical diagnostic tests.

Interpretation of results

Our medical team will comment on out-of-range blood results and give you follow-up advice where necessary. If you need it, a PDF copy of your Bioavailable Testosterone results can be downloaded for your doctor.

Secure online account

Once you have placed your order you can visit where you can manage your account, track your orders and view your Bioavailable Testosterone results.

Health and Lifestyle tracker

Stay motivated by filling in your online health and lifestyle questionnaire and seeing how improvements in your lifestyle can influence your results. Your medical and family history gives us vital information when interpreting your results.

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