Cohort Studyhigh evidence
Age-Stratified Reference Ranges for Directly Measured Serum Free Testosterone in Community-Dwelling and Healthy Men.
The Journal of clinical endocrinology and metabolism·February 20, 2026·PMID 40929374
Why it mattersClinicians evaluating hypogonadism need reliable reference ranges for free testosterone, which is often estimated rather than directly measured. This study provides the largest directly measured free testosterone reference data to date, clarifying expected values by age and BMI.
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