title: Simultaneous determination of the free thyroxine and triiodothyronine fractions in serum.
mesh_terms: D002021:Buffers; D003956:Dialysis; D006801:Humans; D007457:Iodine Radioisotopes; D007475:Ion Exchange Resins; D013974:Thyroxine / Q000097:blood*; D013997:Time Factors; D014284:Triiodothyronine / Q000097:blood*; D014462:Ultrafiltration
chemical_list: D002021:Buffers; D007457:Iodine Radioisotopes; D007475:Ion Exchange Resins; D014284:Triiodothyronine; D013974:Thyroxine