###1: Urate Crystals, 24-Hour Urine
###3: This test identifies or measures urate crystals in urine collected over 24 hours. It may help evaluate uric acid-related kidney stone risk.
["###4: Urate crystals in a 24-hour urine collection can support evaluation for excess urinary uric acid and uric acid kidney stones."]
Key facts at a glance
- LOINC
- 101827-4
- Short code
- Urate cry 24h SatFr Ur
- Synonyms
- Urate cry 24h SatFr Ur
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Ref low
- 3.5
- Ref high
- 7.2
- 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
###5: What the Test Measures
###6: The laboratory examines a 24-hour urine collection for urate crystals, which are deposits formed from uric acid in urine. Results may be reported as present or absent or with a measured amount, depending on the laboratory method.
###7: How the Sample Is Collected
###8: Urine is collected for a full 24-hour period, usually in a designated container. The collection period, start time, end time, and any missed samples should be recorded so the laboratory can interpret the result accurately.
###9: Why It May Be Ordered
###10: This test may be ordered during evaluation of recurrent kidney stones, suspected excess uric acid, gout, or other conditions associated with uric acid crystals. It is commonly considered alongside urine uric acid measurement and other stone-risk tests.
###11: Factors That Can Affect Results
###11: Urate crystallization can vary with hydration, diet, urine acidity, medications, and how promptly the specimen is processed. The healthcare professional should interpret the result together with the rest of the 24-hour urine report.
Reference range
NCBI: Uric Acid Male 3.5-7.2 mg/dL; Female 2.5-6.8 mg/dLN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
###13: Clinical significance: Finding urate crystals may indicate that uric acid is concentrated or supersaturated in the urine, which can occur with uric acid kidney stones or gout. However, crystals can also appear with dietary influences, medication use, dehydration, or specimen handling and do not by themselves establish a diagnosis.
Short name
###2: 24-Hour Urine Urate Crystals
Frequently asked questions
###14: What does a positive result mean?
###16: Does this test diagnose gout or kidney stones?
###18: Can I influence the result?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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 17, 2026. · Read our editorial policy