Oxalate in Urine (24-Hour Collection)

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like frequent kidney stones, unexplained pain in your back or side, or if you have a family history of kidney stones or oxalate-related conditions. It may also be used to monitor people with certain medical conditions, like kidney disease or metabolic disorders, that can affect oxalate levels.

What to Expect Before the Test

You’ll need to collect all urine for a full 24-hour period, typically starting after you wake up in the morning. Empty your bladder first, then collect every drop of urine for the next 24 hours. Store the urine in a refrigerator and bring the entire sample to the lab on the following day.

What to Expect During the Test

No special preparation is needed beyond the 24-hour urine collection. The lab will analyze the sample for oxalate levels using a chemical method.

Possible Results and Their Meaning

Higher-than-normal oxalate levels may indicate an increased risk of kidney stones or other oxalate-related health issues. Lower-than-normal levels may suggest a metabolic condition affecting oxalate production or absorption. Your results will be interpreted in the context of your overall health and medical history.