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I've often seen, read, and heard that the range is for all ages; however, I just got my Labcorp results back for total testosterone and noticed a note underneath stating:

Adult male reference interval is based on a population of

healthy nonobese males (BMI <30) between 19 and 39 years old.

I checked my labs from December and they had the same note. Not sure when/why they started this, I just noticed...