A 33 year old woman has experienced episodes of fatigue, pleural effusion, pericardial effusion and carpal tunnel syndrome and macrocytic anemia. Best test for diagnosis shall be -

ANSWER- D. Assay for thyroid hormonesCarpel tunnel syndrome is a common complication of hypothyroidism and is often reversible with thyroid hormone therapy.Normally hypothyroidism is associated with normochromic anemia but may sometimes also cause macrocytic anemia.