low levels of total serum triiodothyronine ( t3 ) and total serum thyroxine ( t4 ) were observed in the early postoperative weeks in some patients and were associated with symptoms of mild hypothyroidism , but by six months in the presence of a raised serum thyrotropin ( tsh ) the thyroid hormone levels returned to normal .
C0040165
total
C0020676
hypothyroidism