Free testosterone refers to testosterone that circulates in the blood without binding to a carrier protein. Because it remains unbound, free testosterone is available for use by cells with androgen receptor sites, which depend on androgens such as testosterone to regulate their functions. Approximately 2% of testosterone in blood is free or unbound testosterone, while the remaining 98% is transported through the body bound to carrier proteins.

For more information, see Testosterone.

All content and media on the HealthEngine Blog is created and published online for informational purposes only. It is not intended to be a substitute for professional medical advice and should not be relied on as health or personal advice. Always seek the guidance of your doctor or other qualified health professional with any questions you may have regarding your health or a medical condition. Never disregard the advice of a medical professional, or delay in seeking it because of something you have read on this Website. If you think you may have a medical emergency, call your doctor, go to the nearest hospital emergency department, or call the emergency services immediately.