Free Testosterone, Serum

About the Test

Free testosterone, serum measures the unbound fraction of testosterone that is biologically active and readily available to tissues.

It provides a more accurate reflection of hormonal activity compared to total testosterone alone.

• Measures active testosterone
• Not bound to proteins
• Reflects true hormonal activity
• Blood-based test
• Often combined with total testosterone

Why Consider This Test?

Free testosterone, serum is useful when total testosterone levels are inconclusive. It helps diagnose hormonal disorders more accurately.

• Detects androgen imbalance
• Useful in PCOS diagnosis
• Helps assess male hypogonadism
• Clarifies borderline total testosterone results
• Supports infertility evaluation

Who Should Get Tested?

• Men with low testosterone symptoms
• Women with PCOS symptoms
• Infertility cases
• Patients with hormonal imbalance
• Individuals with abnormal total testosterone

More Information

• Often measured with SHBG
• Morning sample preferred
• May vary with age and health
• Helps guide hormone therapy
• Requires clinical correlation