... levels in your blood. This is called an aldosterone-renin ratio test. Renin is a hormone that your kidneys ... of ALD. Other names: aldosterone, serum; aldosterone urine; aldosterone-renin ratio test; aldosterone-plasma renin activity What is it used for? An aldosterone ( ... with the rate or rhythm of your heartbeat) Increased thirst and urination Signs and symptoms of too little ALD (called hypoaldosteronism) include: Low blood ... during an aldosterone test? An aldosterone (ALD) test uses a sample of blood or urine. A test that compares your ALD and renin levels uses a blood sample. During a blood ...