Uric Acid(UA) Determination Reagent is an in vitro diagnostic quantitative test kit. This test is used for Monitoring the risk of developing kidney stones in people who have gout. Uric acid is a normal waste product that your body makes when it breaks down chemicals called purines. Purines come from your cells when they die. Purines are also found in many foods and beverages. Most uric acid dissolves in your blood. Your kidneys filter the uric acid out of your blood, and it leaves your body in your urine. If uric acid builds up in your blood, it can form needle-shaped crystals in and around your joints. This condition is called gout.