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Oxalate in Urine (24-Hour Collection)

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

This test measures the amount of oxalate, a chemical compound, in your urine over a full day. Oxalate can come from food, supplements, or metabolic processes.

Quick summary

["Assessing urinary oxalate helps identify risks for kidney stones or other metabolic conditions."]

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

Key facts at a glance

LOINC
26796-3
Short code
Oxalate Ur Ql
Synonyms
Oxalate Ur Ql
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 This Test Is Done

Doctors may order a 24-hour urine oxalate test if you have a history of kidney stones, especially calcium oxalate stones, or if you have symptoms like pain in your back or side, blood in your urine, or frequent urination. It may also be used to monitor conditions like primary hyperoxaluria or other metabolic disorders that affect how your body processes oxalate.

What to Expect Before the Test

You’ll need to collect all urine for 24 hours, starting from one point in time (often midnight or midnight the next day) and ending at the same time the next day. Store all urine samples in a refrigerator until you return them to the lab. Follow your doctor’s instructions carefully to ensure accurate results.

What Happens During the Test

No special preparation is needed beyond collecting urine over the specified period. The lab processes the combined urine sample to measure oxalate levels.

What the Results Mean

High levels of oxalate in urine may indicate conditions that increase oxalate production or absorption, such as certain genetic disorders or dietary factors. Low levels may suggest other metabolic or health concerns, but results should always be interpreted by your healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

24-Hour Urine Oxalate

Frequently asked questions

How often do I need to take this test?
Your doctor will determine how often you need this test based on your medical history, symptoms, and treatment plan. Follow their guidance closely.
Can I change my diet before the test?
Yes, you may need to follow a specific diet (like a low-oxalate diet) for a few days before the test to get accurate results. Avoid supplements or medications that may affect oxalate levels unless instructed otherwise.
What if I miss any urine during the 24-hour collection?
If you miss any urine, you’ll need to restart the collection from the beginning. Missing even a small amount can affect the test results, so it’s important to stay consistent with the timing.
  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