Reference ranges
Free testosterone reference range
Reference ranges describe the interval a laboratory prints next to your result. They are not a diagnosis of what is “normal” for you personally — your clinician interprets results in context.
General biomarker education — not personalized medical advice. Learn more
What Free testosterone measures
This test estimates or measures testosterone not bound to carrier proteins, which can differ in relative amount from total testosterone.
Why ranges differ
Laboratories set their own reference intervals using their methods, equipment, and population data. That is why the range on your Quest report may differ from a LabCorp report — always use the interval printed on your source document.
Common units
Free testosterone is often reported in pg/mL. Confirm units on your original report before comparing values across time.