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Aldosterone and renin tests are used to evaluate whether the adrenal glands are producing appropriate amounts of aldosterone and to distinguish between the potential causes of excess or deficiency.
Why It Is Done. An aldosterone test is done to: 1  Measure the amount of aldosterone released into the body by the adrenal glands. 2  Check for a tumor in the adrenal glands. 3  Find the cause of high blood pressure or low blood potassium levels.igh levels of both renin and aldosterone are normally present when the body is trying to conserve fluid and salt (sodium). When a tumor that makes aldosterone is present, your aldosterone level will be high while a renin level will be low. Usually a renin activity test is done when the aldosterone level is measured.