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What is a high dose dexamethasone suppression test?

The high dose dexamethasone suppression test will check if the body lowers the cortisol production in response to large doses of artificial steroid. This test is performed by giving the patient 8 mg of dexamethasone at 11 pm and measuring the blood cortisol level the next morning at 8 am. Patients with Cushing's disease (pituitary adenoma) may lower the amount of steroid made in the body while patients with an ectopic tumor usually will not. 

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