Free & Bioavailable Testosterone Calculator

Welcome to the Free & Bioavailable Testosterone Calculator

Also available on Apple Appstore and Google Play

This website has been developed in part through an educational grant from Besins Healthcare (UK) Ltd. The company has no editorial control on its content.

IMPORTANT LIMITATIONS: This calculator is an educational tool and should not be solely relied upon in making any clinical decision. No responsibility whatsoever is assumed for its correctness or suitability for any given purpose. Please consult your health care provider first for any health concerns.

Additionally, the calculated free and bioavailable testosterone should not be relied upon in situations with potential massive interference by steroids binding to SHBG (e.g. in women during pregnancy, in men during treatment inducing high levels of DHT or Mesterolone.

Free & Bioavailable Testosterone Calculator

Albumin*:

Units:

SHBG:

Units:

Testosterone:

Units:

Free Testosterone:

Bioavailable Testosterone:

The 2017 BSSM guidelines on adult testosterone deficiency with statements for UK practice state that a free testosterone level lower than 0.225 nmol/L provides supportive evidence for T therapy in the presence of appropriate symptoms Please see the BSSM guidance for details.”

* The albumin is preset at 43g/L. Please note the units are set as UK standard. If you are aware of the patient’s albumin, please adjust appropriately. If not, this preset should give you a relatively accurate estimate of free testosterone as long as the patient does not have significant ill health which may alter albumin. Evidence from J Clin Endocrinol Metab 84:3666-3672, 1999 – A critical evaluation of simple methods for the estimation of free testosterone in serum.