Urine Microscopic Examination for Crystals (Qualitative)
This test examines your urine under a microscope to identify and confirm the presence of crystals, which may indicate certain kidney or urinary tract conditions.
["Crystals in urine can signal potential health concerns that may need further evaluation."]
Key facts at a glance
- LOINC
- 49755-2
- Short code
- Crystals UrnS Ql Micro
- Synonyms
- Crystals UrnS Ql Micro
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- microscopy-light
- 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 Might Be Ordered
Your healthcare provider may recommend this test if you experience symptoms like frequent urination, pain during urination, blood in urine, or if you have a history of kidney stones, infections, or metabolic disorders. It can also help diagnose conditions like kidney stones, urinary tract infections, or certain metabolic diseases.
What to Expect Before the Test
No special preparation is needed for this test. You’ll typically provide a midstream urine sample in a clean container. If you’re using a home test kit, follow the instructions provided.
What Happens During the Test
The urine sample is sent to a lab where it is examined under a microscope. The lab technician looks for different types of crystals, which can vary in shape, size, and color. This qualitative analysis helps determine if crystals are present.
Possible Results and Their Meaning
The test result will indicate whether crystals are found in your urine. If crystals are detected, they may suggest conditions like kidney stones (e.g., calcium oxalate), certain infections, or metabolic issues. However, crystals alone don’t always indicate a problem; further testing may be needed to diagnose the underlying cause.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Urine Crystal Check
Frequently asked questions
What Does This Test Tell Us About My Health?
What Are Common Causes of Crystals in Urine?
How Often Should I Get This Test?
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