Question: can tsh be normal in hyperthyroidism?
Answer: Hyperthyroidism is associated with suppressed levels of TSH (typically, <0.5 mU/L). Rarely, an elevated TSH level can be associated with hyperthyroidism if there is a pituitary adenoma secreting TSH. If the TSH is normal (0.5-5 mU/L in most labs), a diagnosis of hyperthyroidism is very unlikely.