A patient has an increased TSH with a decreased free T4. Which condition is most likely?
1Secondary hypothyroidism
2Primary hyperthyroidism
3Euthyroid sick syndrome
4Primary hypothyroidism✓ 정답
해설
When the peripheral hormone is deficient, the pituitary secretes more stimulating hormone. An elevated thyroid-stimulating hormone with a low free T4 localizes the problem to the thyroid gland itself, that is, primary hypothyroidism. In secondary hypothyroidism the stimulating hormone would also be low.