Cart

Selected lab test is not available at this location

Thyroxine Binding Globulin (TBG)

About Test

TBG (Thyroxine Binding Globulin) - Thyroxine-binding globulin (TBG), a glycoprotein produced in the liver, binds both thyroxine (T4) and triiodothyronine (T3) with high affinity. Because TBG accounts for 76% of plasma protein thyroxine-binding activity, an increase or decrease in its circulating level alters total concentrations of T4 and T3 in blood, leading to potential confusion with true thyroid gland dysfunction. 

Cart

Selected lab test is not available at this location