If you suffer from gout or kidney stones, this test is key to finding the cause. It measures the total amount of uric acid your kidneys excrete over a full 24-hour period. This is crucial for your doctor to determine why your uric acid levels are high: are you over-producing it, or are your kidneys not removing it effectively? The answer guides your treatment plan. This test, requiring a 24-hour urine collection, provides the deep, diagnostic data needed to create the right long-term treatment plan for you.