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Thyroid Disorders 

Thyroid Disorders
Chapter:
Thyroid Disorders
Author(s):

Marius N. Stan

DOI:
10.1093/med/9780190464868.003.0018
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date: 19 October 2019

Current assays measure thyrotropin (previously called thyroid-stimulating hormone) concentrations as low as 0.01 mIU/L, allowing differentiation between low-normal values and suppressed values. In patients with normal pituitary, thyrotropin levels are increased in primary hypothyroidism, during recovery from nonthyroid illness, and with thyroid hormone resistance. Thyrotropin levels are low in hyperthyroidism, in nonthyroidal illness, in the first trimester of pregnancy, and with the use of certain drugs (eg, somatostatin, dopamine, and glucocorticoids). Measurement of the thyrotropin level is the best single test of thyroid function in these patients.

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