Versions of The Test
This test can be given as a low-dose short test, a conventional-dose short test, or as a prolonged-stimulation test.
In the low-dose short test, 1 µg of an ACTH drug is injected into the patient. In the conventional-dose short test, 250 µg of drug are injected. Both of these short tests last for about an hour and provide the same information. Studies have shown the cortisol response of the adrenals is the same for the low-dose and conventional-dose tests.
The prolonged-stimulation test, which is also called a long conventional-dose test, can last up to 48 hours. This form of the test can differentiate between primary, secondary, and tertiary adrenal insufficiency. This form of the test is rarely performed because earlier testing of cortisol and ACTH levels in association with the short test may provide all the necessary information.
Read more about this topic: ACTH Stimulation Test
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