What Is the Urinary Oxalate Test?

Oxalate is a compound produced in the body and also ingested through diet. Excess oxalate can bind with calcium to form crystals in the urine, which may develop into kidney stones. The urinary oxalate test typically involves collecting urine over 24 hours to accurately measure oxalate excretion, providing valuable information about your kidney health and metabolism.

Why Is This Test Important?

• Evaluates risk and monitors treatment of calcium oxalate kidney stones.
• Assists in diagnosing metabolic disorders such as primary or secondary hyperoxaluria.
• Helps guide dietary and medical interventions to reduce stone formation.
• Assesses effectiveness of therapies to lower oxalate levels.

How Is the Test Performed?

1. You collect all urine passed in a 24-hour period in a special container.

2. Complete collection and proper storage (often refrigerated) during this time are crucial for accuracy.

3. Diet and medication instructions will be given to avoid affecting results.

4. The collected urine is analyzed in the lab to measure oxalate concentration and total excretion.

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What to Expect

The test is non-invasive but requires careful adherence to collection instructions. You may be asked to avoid oxalate-rich foods and certain supplements before and during the test. Results help your healthcare provider tailor treatments to prevent kidney stones and improve metabolic balance.