An ACTH hormone blood test is a laboratory test that measures the levels of the hormone ACTH in the blood. ACTH is produced by the pituitary gland that stimulates the adrenal glands to release cortisol, a hormone that helps the body respond to stress. The test is often used to help diagnose and monitor conditions that affect the pituitary and adrenal glands, such as Cushing's syndrome and Addison's disease. The results of the test are reported as the ACTH level in the blood, and abnormal levels can indicate a problem with the pituitary or adrenal glands.
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