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With this test, you can find out how much aldosterone (ALD) is in your blood or urine. Your adrenal glands, two little glands above the kidneys, produce the hormone ALD. ALD supports optimal salt and potassium levels while regulating blood pressure. These minerals are called electrolytes that 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.