153. A 68-year-old woman has been hospitalized for 2 weeks because of severe pneumonia complicated by septicemia and respiratory failure. She has a long-standing history of type 2 diabetes mellitus and a family history of chronic autoimmune (Hashimoto) thyroiditis. Her serum triiodothyronine (T3) and thyroxine (T4) concentrations are below the reference ranges, and serum thyroid-stimulating hormone and free T4 concentrations are within the reference ranges. Which of the following best explains these findings? A) Antithyroid antibodies B) Euthyroid sick syndrome C) Hypothyroidism D) Increased serum T binding globulin concentration E) lodine deficiency

153. A 68-year-old woman has been hospitalized for 2 weeks because of severe pneumonia complicated by septicemia and respiratory failure. She has a long-standing history of type 2 diabetes mellitus and a family history of chronic autoimmune (Hashimoto) thyroiditis. Her serum triiodothyronine (T3) and thyroxine (T4) concentrations are below the reference ranges, and serum thyroid-stimulating hormone and free T4 concentrations are within the reference ranges. Which of the following best explains these findings? A) Antithyroid antibodies B) Euthyroid sick syndrome C) Hypothyroidism D) Increased serum T binding globulin concentration E) lodine deficiency