Laboratory Medical Test: What Patients Need to Know About Testing and Understanding Your Results
This test detects the presence of ammonium urate crystals in urine, which may indicate certain metabolic or kidney conditions.
{"Ammonium urate crystals can form in urine when the body produces too much ammonia or when urine is acidic","The test uses computer-assisted analysis to identify these crystals in a urine sample","Finding these crystals may be associated with urinary tract infections, kidney stones, or certain metabolic conditions"}
Key facts at a glance
- LOINC
- 33239-5
- Short code
- Amm Urate Cry Ur Ql Comp Assist
- Synonyms
- Amm Urate Cry Ur Ql Comp Assist
- 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
- Method
- computer-assisted
- 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
This test is a laboratory analysis that helps your healthcare provider evaluate your overall health, screen for certain medical conditions, and monitor how well a current treatment plan is working for you over time.
The Ammonium Urate Crystals test is a urine analysis that looks for the presence of ammonium urate crystals. These crystals form when ammonia combines with uric acid in the urine. The test uses specialized computer-assisted microscopy to identify and analyze these crystals. While small amounts of crystals may occasionally appear in healthy individuals, significant quantities can indicate underlying health conditions that may need attention.
The test is performed by collecting a small sample, usually blood drawn from a vein in your arm or a urine specimen, by a trained professional in a clinic or laboratory. The procedure is quick, and most people feel only mild, brief discomfort.
A urine sample is collected, typically first thing in the morning for the most accurate results. The sample is then analyzed using a computer-assisted microscopy system that can detect and characterize ammonium urate crystals. This automated method provides consistent results and can identify even small amounts of crystals that might be missed by manual examination.
Your results are compared with established reference ranges to show whether your values fall within normal limits. Abnormal findings do not always indicate a serious problem; your provider will interpret them together with your symptoms, history, and other tests.
Results are typically reported as either "present" or "absent," or sometimes with a semi-quantitative scale (such as rare, few, moderate, or many). Your healthcare provider will interpret these results in the context of your overall health, other test results, and any symptoms you may have. The presence of ammonium urate crystals alone does not necessarily mean you have a serious condition—it may require follow-up testing to determine the cause.
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.
The presence of ammonium urate crystals in urine can be associated with several conditions. These crystals are more commonly found in acidic urine and may indicate a urinary tract infection, particularly with bacteria that produce urease. They can also be associated with kidney stones, particularly in people with certain metabolic conditions. In some cases, ammonium urate crystals may appear in patients with liver disease or those following very high-protein diets. However, the clinical significance must be interpreted alongside other clinical findings and test results.
Frequently asked questions
Is finding ammonium urate crystals in my urine dangerous?
Do I need to prepare specially for this test?
Can diet affect the results?
Will I need treatment if crystals are found?
Sources
- 1
- 2
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