With this test, you can find out how much aldosterone (ALD) is in your blood. Your adrenal glands are two little glands above the kidneys that produce the hormone ALD. ALD supports optimal salt and potassium levels while regulating blood pressure. Minerals called electrolytes keep your body's fluid balance in check and maintain healthy nerve and muscle function. ALD levels that are abnormally high or low may indicate a significant medical condition. Renin is a hormone produced by the kidneys that is frequently tested in conjunction with ALD tests. Renin signals the adrenals to produce ALD.