How to check uric acid stones: 1. Uric acid stones are stones composed mainly of uric acid, so the level of uric acid in the blood is relatively high. 2. Because uric acid stones are composed mainly of uric acid, they contain very little calcium and basically do not show the shadow of stones on X-rays, also known as negative stones, and can only be shown on CT or ultrasound. The CT value of uric acid stones is around 500 μmol/L. 3. Another way to confirm the diagnosis is to use the stone specimen and analyze the stone composition, which can be done by using the patient’s discharged stones and analyzing the stone composition with infrared analyzer.