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Was (wer) ist ACTH stimulation test - definition
![The [[adrenal glands]] sit atop the kidneys.](https://commons.wikimedia.org/wiki/Special:FilePath/Illu adrenal gland.jpg?width=200 "The [[adrenal glands]] sit atop the kidneys.")
![Location of the [[pituitary gland]].](https://commons.wikimedia.org/wiki/Special:FilePath/Pituitary gland.png?width=200 "Location of the [[pituitary gland]].")
![Lateral X-ray of the head: Deep brain stimulation in [[Obsessive–compulsive disorder]] (OCD). 42-year-old man, surgery in 2013.](https://commons.wikimedia.org/wiki/Special:FilePath/X-ray of deep brain stimulation in OCD, L.png?width=200 "Lateral X-ray of the head: Deep brain stimulation in [[Obsessive–compulsive disorder]] (OCD). 42-year-old man, surgery in 2013.")
Wikipedia
The ACTH test (also called the cosyntropin, tetracosactide, or Synacthen test) is a medical test usually requested and interpreted by endocrinologists to assess the functioning of the adrenal glands' stress response by measuring the adrenal response to adrenocorticotropic hormone (ACTH; corticotropin) or another corticotropic agent such as tetracosactide (cosyntropin, tetracosactrin; Synacthen) or alsactide (Synchrodyn). ACTH is a hormone produced in the anterior pituitary gland that stimulates the adrenal glands to release cortisol, dehydroepiandrosterone (DHEA), dehydroepiandrosterone sulfate (DHEA-S), and aldosterone.
During the test, a small amount of synthetic ACTH is injected, and the amount of cortisol (and sometimes aldosterone) that the adrenals produce in response is measured. This test may cause mild side effects in some individuals.
This test is used to diagnose or exclude primary and secondary adrenal insufficiency, Addison's disease, and related conditions. In addition to quantifying adrenal insufficiency, the test can distinguish whether the cause is adrenal (low cortisol and aldosterone production) or pituitary (low ACTH production). The Insulin tolerance test is recognized as the gold standard assay of adrenal insufficiency, but due to the cumbersome requirement for a two-hour test and the risks of seizures or myocardial infarction, the ACTH stimulation test is commonly used as an easier, safer, though not as accurate, alternative. The test is extremely sensitive (97% at 95% specificity) to primary adrenal insufficiency, but less so to secondary adrenal insufficiency (57-61% at 95% specificity); while secondary adrenal insufficiency may thus be dismissed by some interpreters on the basis of the test, additional testing may be called for if the probability of secondary adrenal insufficiency is particularly high.
Adrenal insufficiency is a potentially life-threatening condition. Treatment should be initiated as soon as the diagnosis is confirmed, or sooner if the patient presents in apparent adrenal crisis.
