2-Hour Urine Urate Excretion Rate
This test measures the rate at which urate, also called uric acid, is excreted in urine collected over a 2-hour period.
["The result helps assess how much uric acid the kidneys are eliminating during the collection period."]
Key facts at a glance
- LOINC
- 17755-0
- Short code
- Urate 2h Ur-mRate
- Synonyms
- Urate 2h Ur-mRate
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Ref low
- 20
- Ref high
- 400
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 82670
- 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
What This Test Measures
Urine urate reflects uric acid filtered by the kidneys and then passed into the urine. Measuring the excretion rate can help evaluate uric acid handling when a timed urine collection is clinically appropriate.
How the Test Is Performed
You collect all urine for the specified 2-hour period, following the preparation instructions provided by your healthcare professional. The sample is then analyzed, and the urate amount is adjusted for the collection time.
Why the Test May Be Ordered
This test may be used alongside blood uric acid testing when evaluating gout, kidney stones, or unusual uric acid excretion. It may also help assess treatment or diet-related changes in uric acid metabolism.
Preparing for the Collection
Follow the exact collection period and dietary instructions given by your clinician. Missing urine or collecting outside the specified time can make the calculated excretion rate less reliable.
Reference range
Premenopausal: 20-400 pg/mL; Postmenopausal: <30 pg/mLN/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.
Clinical significance
Short name
2-Hour Urine Uric Acid Excretion
Frequently asked questions
FAQ question
FAQ question
FAQ question
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 16, 2026. · Read our editorial policy