45% to 65% sex hormone binding globulin SHBG SHBG-serum men sex hormone binding globulin SOURCE sex hormone binding globulin Sex Hormone Binding Globulin Sex Hormone Binding Globulin (SHBG) Sex Hormone Binding Globulin SOURCE SHBG (Sex Hormone Binding Globulin) 66% to 78% TeBG SOURCE Testosterone-estrogen Binding Globulin women SHBG (Sex Hormone Binding Globulin) ref