title: Letter: Free thyroxine index vs. free thyroxine concentration in inherited partial thyroxine binding globulin (TBG) deficiency.
mesh_terms: D019411:Clinical Laboratory Techniques; D003937:Diagnosis, Differential; D006801:Humans; D012712:Serum Globulins / Q000172:deficiency; D013974:Thyroxine / Q000097:blood*; D013975:Thyroxine-Binding Proteins / Q000172:deficiency*
chemical_list: D012712:Serum Globulins; D013975:Thyroxine-Binding Proteins; D013974:Thyroxine