Understanding Your Medical Test: What It Is, How It's Done, and What Your Results Mean

Published: August 9, 2026Updated: August 17, 2026

A urine test that examines sediment under a microscope to detect amorphous urate crystals, which may indicate high uric acid levels or certain dietary habits.

Quick summary

{"Amorphous urate crystals are salt deposits from uric acid found in acidic urine","They appear as small, granular particles under the microscope","High levels may be associated with high-purine diets, gout, or kidney issues","The test helps doctors evaluate kidney function and metabolic health","Results are reported as number of crystals per low power field"}

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC: 40484-8
Short code: Amorph Urate Cry #/area UrnS LPF
Synonyms: Amorph Urate Cry #/area UrnS LPF
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: microscopy-light-lpf
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

The urate crystals amorphous test is a microscopic examination of urine sediment. It identifies and counts amorphous (shapeless) urate crystals, which are tiny salt particles formed from uric acid. These crystals typically form in acidic urine and can appear as fine, granular deposits when viewed under a microscope at low power.

How is this test performed, and what can I expect during the procedure?

A urine sample is collected and spun in a centrifuge to separate solid particles from liquid. The sediment is then placed on a slide and examined under a microscope. The laboratory technician counts the number of amorphous urate crystals seen in each low power field (LPF). The results are reported as the number of crystals per area observed.

What do my test results mean, and when should I expect to discuss them with my doctor?

The presence and quantity of amorphous urate crystals can provide important information about your body's uric acid metabolism. Moderate amounts may be normal, especially after consuming foods high in purines (such as red meat, organ meats, and certain seafood). However, high levels may indicate conditions that need attention, such as gout, kidney stone formation, or kidney function issues.

Reference range

NCBI: Uric Acid Male 3.5-7.2 mg/dL; Female 2.5-6.8 mg/dLN/A

Specimen: urine

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.

Amorphous urate crystals in urine may indicate: elevated uric acid production from diet or metabolism, gout (a type of arthritis caused by uric acid crystals in joints), risk of uric acid kidney stones, or impaired kidney function affecting uric acid excretion. The test is often ordered as part of a complete urinalysis to evaluate kidney health and metabolic disorders. Persistent crystal presence may require further testing such as blood uric acid levels, kidney function tests, or 24-hour urine collection for uric acid quantification.

Frequently asked questions

Do I need to fast before this test?

No special preparation is typically required. However, your doctor may ask you to avoid certain foods (like red meat and alcohol) before the test, as these can temporarily increase uric acid levels. Always follow your healthcare provider's specific instructions.

Is this test painful?

No. The test uses a routine urine sample, which is non-invasive and painless. You simply urinate into a sterile container provided by the lab.

What does it mean if I have high urate crystals?

High levels of amorphous urate crystals may suggest high uric acid in your body. This could be due to a diet rich in purines, gout, kidney issues, or certain metabolic conditions. Your doctor will interpret the results in context with your overall health and other test results.

Can the test detect kidney stones?

While this test looks at amorphous urate crystals (which are very small and don't form stones), it may help identify conditions that lead to kidney stone formation. If uric acid crystals are persistent, your doctor may recommend additional tests to evaluate your risk for kidney stones.

How can I reduce urate crystals in my urine?

Recommendations may include: drinking plenty of water (at least 8 glasses daily), reducing intake of purine-rich foods (red meat, organ meats, shellfish), limiting alcohol, maintaining a healthy weight, and following any treatment plan your doctor prescribes for underlying conditions like gout.

Sources

1
Mayo Clinic - Uric acid stoneSource
2
National Institute of Diabetes and Digestive and Kidney Diseases - GoutSource
3
MedlinePlus - UrinalysisSource

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 17, 2026. · Read our editorial policy