TSH is normal in: September 2006: (A) Hypehyroid, (B) Euthyroid, (C) Hypothyroid, (D) Graves
Answer is B. Ans. B: EuthyroidIn hypehyroidism:Total plasma T3, T4, 3 is highFree plasma T3, T4, 3 is highPlasma TSH is lowIn hypothyroidism:Total plasma T3, T4, 3 is lowFree plasma T3, T4, 3 is lowPlasma TSH is highGraves disease is most common cause of hypehyroidism.