Free testosterone is the unbound fraction that directly fuels muscle growth, energy, libido, and mental sharpness in men. It may provide a clearer picture of your androgen status than total testosterone alone. Your healthcare provider can help evaluate your results.
Doctor's Assessment Included
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.
For men, free testosterone is the key driver of masculine vitality, strength, and reproductive function. Even with normal total testosterone, low free testosterone could suggest your body isn't accessing enough active hormone. Discuss your results with a healthcare provider for tailored advice.
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.
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 fraction your body can use directly. No referral needed.
Comprehensive testosterone workup.
Total Testosterone, Free Testosterone, SHBG, and Albumin: key male hormone markers.
Infectious-disease screening plus male reproductive hormones for the IVF partner.
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,-
