Free testosterone is the bioavailable portion of testosterone that directly influences your energy, muscle maintenance, and mood. Monitoring this marker may help detect hormonal changes early. Discuss your results with a healthcare provider for personalised health guidance.
Doctor's Assessment Included
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Choose male or female — this range differs by sex.
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This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.
Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.
Check your own valueThis test measures the fraction of testosterone not bound to proteins like SHBG or albumin. Free testosterone represents roughly 1-3% of total testosterone but is the most biologically active form. Your healthcare provider may compare this with total testosterone for a complete picture.
Free testosterone reflects your body's usable androgen supply, influencing vitality, body composition, and cognitive function. Changes in levels could suggest age-related decline or other factors worth investigating. A healthcare provider can help you understand your results and suggest appropriate next steps.
Preferably in the morning
RecommendedA morning draw makes this value easiest to compare with its reference range. Plan the draw before 10:00 if you can.
Your healthcare provider may recommend testing free testosterone when experiencing fatigue, reduced libido, muscle loss, or mood changes. It could also be useful when total testosterone is normal but symptoms persist. Consult your provider for advice on optimal testing timing.
Some people may experience persistent fatigue, decreased muscle mass, low mood, reduced libido, or difficulty concentrating when free testosterone is low. Weight gain and decreased bone density could also suggest insufficient bioavailable testosterone. A healthcare provider can help assess your symptoms.
Elevated free testosterone may be associated with acne, excess hair growth, irritability, or aggression. In women, high levels could suggest polycystic ovary syndrome or other hormonal conditions. Your healthcare provider can evaluate whether your levels require further investigation.
Low free testosterone may cause symptoms despite normal total testosterone. Consider SHBG testing and consultation with an endocrinologist.
Elevated free testosterone may indicate steroid use or testicular tumors. Consult with an endocrinologist for comprehensive evaluation.
Low free testosterone may cause decreased libido and energy. Consider comprehensive hormone evaluation with an endocrinologist.
High free testosterone may indicate PCOS or adrenal disorders. Consider evaluation for PCOS and lifestyle modifications including weight management.
Regular resistance training, adequate sleep, stress management, and maintaining a healthy body weight may support healthy testosterone levels. Ensuring sufficient zinc and vitamin D intake could also contribute positively. Always discuss supplementation or significant lifestyle changes with your healthcare provider.
Free testosterone is the unbound, active form that can directly enter cells and drive biological effects.
Total testosterone includes bound and unbound forms; free testosterone measures only the active, usable fraction.
Resistance training and healthy sleep patterns may support free testosterone. Consult your provider for guidance.
This marker is included in the following test panels.
Measure your free testosterone, the bioavailable fraction your body can use directly. No referral needed.
Total Testosterone, Free Testosterone, SHBG, and Albumin: key male hormone markers.
A 7-biomarker fitness panel inspired by InsideTracker's Fitness category — total and free testosterone, SHBG, DHEA-S, cortisol, B12 and folate behind your fitness score.
A 12-biomarker hormone panel inspired by InsideTracker's Hormone Balance category — estradiol, progesterone, testosterone, SHBG, DHEA-S, cortisol, TSH and the minerals behind your hormone score.
Articles that explain this value in context.
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Dr. Naimi oversees the medical standards behind our content and assessments.
Medical policyDoctor's Assessment Included
Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.
Free Testosterone
€105,-
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