TRTThree numbers, different jobs
Total T includes bound and unbound hormone. Free T is the unbound fraction. SHBG binds testosterone and can help explain why total and free T point in different directions.
Read the method before the range
Use the performing lab’s interval and record the collection timing. A harmonized research interval of 264 to 916 ng/dL came from healthy nonobese men aged 19 to 39. Your report may use another assay or reference population.
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Measured free T and calculated free T can differ. Keep your calculation method, units and input assays consistent when you compare results over time.
Sources
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