title: Triiodothyronine and thyroxine assays in Italy: results from a one year external quality control scheme organized by CNR.
mesh_terms: D006801:Humans; D007558:Italy; D007753:Laboratories / Q000592:standards*; D011786:Quality Control; D011863:Radioimmunoassay / Q000592:standards*; D011933:Reagent Kits, Diagnostic / Q000592:standards; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood*
chemical_list: D011933:Reagent Kits, Diagnostic; D014284:Triiodothyronine; D013974:Thyroxine