A33-year-old woman is noted by her physician to have some fatigue and some coarse skin. her only medication is oral contraceptive agent. the following laboratories have been returned.
tsh 1.0mu/l (0.35-6.0mu/l)
free thyroxine 1.0 ng/dl (0.8-2.7 ng/dl)
total thyroxine 13.0 ? dl (4.5-12.0 ? gdl)
thyroid-binding globulin (tbg) 55ng/ml (15-34mgl)
which of the following is the most likely diagnosis?
a) hyperthyroidism
b) hypothyroidism
c) normal thyroid status
d) transient hyperthyroidism