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24-Hour Urine Oxalate

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

This test measures the amount of oxalate, a chemical that can contribute to kidney stones, in your urine over a full day.

Quick summary

["Helps assess risk of kidney stones and metabolic conditions linked to oxalate metabolism."]

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

Key facts at a glance

LOINC
2702-9
Short code
Oxalate Cl 24h Ur+SerPl-vRate
Synonyms
Oxalate Cl 24h Ur+SerPl-vRate
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order a 24-hour urine oxalate test if you have a history of kidney stones, symptoms like pain in your back or side, frequent urination, or blood in your urine. It may also be used to monitor conditions like primary hyperoxaluria or other metabolic disorders affecting oxalate metabolism.

How the Test Is Collected

You’ll collect all urine for a full 24-hour period, typically starting after you wake up. Empty your bladder at the start and end of the collection period, then store all urine in a container. Bring the entire sample to your lab on the next day.

What to Expect During the Test

No special preparation is needed, but avoid certain foods (like spinach, nuts, or chocolate) that may affect oxalate levels for a few days before testing. Drink plenty of water to help flush oxalates naturally.

Possible Results and Interpretation

Results are compared to your body’s natural oxalate levels over time. High levels may indicate kidney stones, metabolic disorders, or malabsorption issues. Your provider will discuss findings with you based on your medical history and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Oxalate in Urine (24-hour collection)

Frequently asked questions

What does an elevated oxalate level mean?
Elevated levels may suggest an increased risk of kidney stones or conditions like primary hyperoxaluria, where the body produces too much oxalate. Your provider will evaluate results alongside other tests and symptoms to guide treatment.
What does a normal range indicate?
Normal results typically mean your body is processing oxalates efficiently, but ongoing monitoring may still be needed if you have a history of kidney issues or metabolic disorders.
Can diet changes affect this test?
Yes—dietary adjustments (like reducing oxalate-rich foods) or medications may influence results. Follow your provider’s guidance on timing and preparation to ensure accurate results.
  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