Current Endocrine Society guidelines recommend measuring fT in men with low-normal TT levels in whom SHBG alterations are suspected with low values established within each laboratory. 1 The combined guidelines from the ASA, EAA, EAU, ISA, and ISSAM similarly recommend obtaining fT levels in men with TT 231–346ng/dl (8–12 nmol/L), with a
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high testosterone vs low testosterone