The TSH test is a blood test that measures the level of thyroid-stimulating hormone in the blood. TSH is produced by the pituitary gland and regulates the production of thyroid hormones by the thyroid gland.
Abnormal TSH levels can indicate thyroid dysfunction, such as hypothyroidism (underactive thyroid) or hyperthyroidism (overactive thyroid).
A high TSH level usually indicates hypothyroidism, while a low TSH level usually indicates hyperthyroidism.
The TSH test is often used to diagnose and monitor thyroid disorders, as well as to adjust medication doses for thyroid conditions. It is usually ordered along with other thyroid function tests, such as T3 and T4, to get a complete picture of thyroid health.
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