Provided are a simple and minimally invasive testing method and an agent for diagnostic tolerance testing for distinguishing aldosterone-producing adenoma and idiopathic aldosteronism. Provided is the agent for diagnostic tolerance testing for distinguishing aldosterone-producing adenoma and idiopathic aldosteronism, which includes adrenocorticotropin as an effective component, and which is characterized in that 90-180 minutes after the tolerance testing agent is administered to a subject, aldosterone in a sample obtained from the subject is measured. Additionally, provided is a testing method for distinguishing aldosterone- producing adenoma and idiopathic aldosteronism.
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