The corticotropin-releasing hormone (CRH) stimulation test helps determine whether a pituitary tumor may be causing Cushing's syndrome. It is sometimes done with an inferior petrosal sinus sampling (IPSS) test.
In these tests, a small tube (catheter) is used to collect samples from blood vessels coming from the pituitary gland near the brain and also from a vein in your arm. You will get an injection of CRH, and samples of your blood near your pituitary gland and from your arm are taken.
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