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Aldosterone is a mineral (salt)-retaining steroid and a hormone that directly regulates the retention of sodium (salt) by the kidneys and indirectly regulates the excretion of potassium. It is vital in the control of blood volume and blood pressure. Aldosterone is produced by the adrenal cortex, which is the outer portion of the two adrenal glands that are located at the top of each kidney. In most cases it is necessary to measure both renin and Aldosterone (and occasionally cortisol) in order to get a complete picture of what is happening with hormone production. These tests may be ordered to help in diagnosing and monitoring conditions associated with Aldosterone excess or deficiency.