Is hypothyroidism causing your patient's lethargy?
D006801:Humans; D007037:Hypothyroidism / Q000175:diagnosis / Q000188:drug therapy*; D013960:Thyroid Function Tests; D013972:Thyrotropin / Q000097:blood*; D013974:Thyroxine / Q000097:blood / Q000627:therapeutic use*
D013972:Thyrotropin; D013974:Thyroxine