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 ug of an ACTH drug is injected into the patient. In the conventional-dose short test, 250 ug 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,

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