Testosterone testing gets oversimplified because one number feels easier to market. In practice, total and free testosterone answer related but different questions.
Total testosterone
Total testosterone measures testosterone in the blood, including hormone bound to proteins and the smaller unbound fraction.
Free testosterone
Free testosterone estimates or measures the portion not bound to proteins. It can be useful when binding proteins such as SHBG may change interpretation.
Timing matters
Testosterone can vary by time of day, sleep, illness, calorie intake, medications, and training stress. Morning collection is commonly preferred for many evaluations.
Practical bottom line
Total testosterone is a common starting point. Free testosterone and related markers can add context when the first answer does not match symptoms or risk factors.
Frequently asked questions
This article is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LabTestSuperstore does not diagnose, treat, or prescribe.