Which diagnostic test is useful in determining if a pituitary dysfunction is causing a thyroid disorder?

Question

Quizplus · Accepted Answer

Serum TSH levels are the most useful diagnostic test in determining if a pituitary dysfunction is causing a thyroid disorder. In primary hypothyroidism, TSH levels are increased, while in secondary hypothyroidism (caused by pituitary dysfunction), TSH levels may be low or normal despite low thyroid hormone levels. Therefore, measuring serum TSH levels can help differentiate between primary and secondary hypothyroidism.

Which Diagnostic Test Is Useful in Determining If a Pituitary