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Oxalate Urine Measurement

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of oxalate, a compound formed from vitamin C and certain foods, in your urine over a 24-hour period. Oxalate can contribute to kidney stones if levels are consistently high.

Quick summary

["This test helps assess risk for kidney stones by checking for elevated oxalate in urine."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
111445-3
Short code
Oxalate Msmt Ur
Synonyms
Oxalate Msmt Ur
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may recommend this test if you have a history of kidney stones, symptoms like pain in your back or side, blood in your urine, or if you’re at risk due to diet, genetics, or other health conditions. It helps identify whether oxalate is contributing to stone formation.

What to Expect Before the Test

No special preparation is needed, but you’ll collect all urine for a full 24-hour period. Drink plenty of water to help flush out oxalate naturally. Avoid certain supplements or medications that may affect results, as advised by your doctor.

How the Test Works

Urine is collected in a container over 24 hours. The sample is then analyzed in a lab to measure oxalate levels, which are compared to reference ranges to determine if they’re within normal limits or elevated.

Possible Results and Interpretation

High oxalate levels may indicate an increased risk of kidney stones or other conditions like celiac disease or certain metabolic disorders. Low levels may suggest malabsorption or dietary deficiencies. Your doctor will discuss results in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine Oxalate

Frequently asked questions

What causes high oxalate levels in urine?
High oxalate levels can result from diet (e.g., high intake of spinach, nuts, chocolate), certain medical conditions (like kidney disease or celiac disease), or metabolic issues. Genetics may also play a role in how your body processes oxalate.
How can I lower my oxalate levels?
Dietary changes are key—reduce foods high in oxalates (e.g., nuts, chocolate, leafy greens) and increase fluids to help flush oxalate. Your doctor may also recommend supplements like calcium citrate or vitamin D if needed, but avoid excessive vitamin C.
Does this test require fasting?
No, fasting is not required. The test measures 24-hour urine output, so drinking water normally throughout the day is fine. Avoiding certain medications or supplements that could interfere with results is the only special note.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy