Euthyroid sick syndrome and free thyroxine assay.
D003937:Diagnosis, Differential; D006801:Humans; D007037:Hypothyroidism / Q000175:diagnosis*; D013960:Thyroid Function Tests / Q000379:methods*; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood
D014284:Triiodothyronine; D013974:Thyroxine