Urine Uric Acid to Creatinine Ratio

This test measures how much uric acid is present in a spot urine sample compared with creatinine. Creatinine is produced at a relatively steady rate, so using it as a denominator helps correct for how concentrated or dilute your urine is at the moment of collection.

The ratio provides a practical way to estimate urinary uric acid excretion without a full day collection. Clinicians use it to assess how your kidneys handle uric acid and to monitor conditions or treatments that influence uric acid production and elimination.

Too much uric acid in the urine can promote formation of certain kidney stones and may be influenced by diet, metabolism, or medicines. Too little can reflect reduced production or impaired kidney handling. Your clinician may order this test if you have kidney stones, gout, unexplained urinary findings, or if you are taking medicines that change uric acid balance.

The ratio is especially helpful when a spot urine is the most practical sample. It can guide changes in diet, hydration, or medication and can help determine whether additional testing, such as a timed urine collection or blood tests, is needed.

Interpreting this ratio depends on your age, hydration, and overall health. A higher ratio can mean increased uric acid excretion or more dilute urine, while a lower ratio can reflect reduced excretion or more concentrated urine. Your clinician will consider your symptoms, kidney function, and medications when discussing what your result means for you.

If a result is unexpected, you may be asked to repeat the test, adjust hydration before collection, or complete a timed urine collection for a more detailed assessment. Changes over time are often more informative than a single value, and results are best interpreted alongside other labs and your clinical history.