What do the results mean?Results of an ACTH test are often compared with the results of cortisol tests and may show one of the following:High ACTH and high cortisol levels: This may mean Cushing's disease.Low ACTH and high cortisol levels: This may mean Cushing's syndrome or a tumor of the adrenal gland.High ACTH and low cortisol levels: This may mean Addison disease.Low ACTH and low cortisol levels. This may mean hypopituitarism.If you have questions about your results, talk to your health care provider.Learn more about laboratory tests, reference ranges, and understanding results.
