24-hour urine oxalate test
Quick answer: This test measures oxalate, a substance that can combine with calcium to form kidney stones, in a 24-hour urine collection. Doctors order it for people with repeated or unexplained kidney stones.
- Sample24-hour urine
- Takes24 hours of collection at home
- Before the testCollect all your urine for 24 hours as instructed; your doctor may ask you to keep to your usual diet during the collection.
How the test is done
- 1You collect a container, which may contain an acid preservative, from the lab
- 2You flush your first morning urine and note the time
- 3You collect all urine for 24 hours while eating your usual diet
- 4You add the next first morning urine and return the container
What your results can mean
Reading your report
Normal ranges differ between labs and by age and sex, so discuss your result with your doctor.
If the result is outside the usual range
A high level can be seen with a diet rich in oxalate, some bowel conditions that increase oxalate absorption, or rare inherited conditions. A high result can raise the chance of calcium oxalate stones.
Who usually has this test
People who have had more than one kidney stone, or a stone at a young age.
Risks and aftercare
Avoid touching any preservative in the container, and rinse with water if it spills on skin.
Names and options
Also called: urine oxalate
Listed by the hospital as
- 24 HR URINE OXALATE
Questions about this test
Which foods are high in oxalate?
Spinach, beetroot, nuts, chocolate and strong tea are common high-oxalate foods. Your doctor or dietitian can explain whether you need to change your diet based on your result.
Why does my container have a preservative in it?
Oxalate can change in urine left standing, so many labs add an acid preservative. It is strong, so do not empty it out and keep it away from children.
Can vitamin C supplements affect urine oxalate?
High doses of vitamin C can be turned into oxalate in the body. Tell your doctor about any supplements before the test.
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.