Calculi Risk Assessment, Urine
Also known as: CRA
Use
The Calculi Risk Assessment, Urine test is used for assessing and monitoring kidney stone risk. It involves a panel of analytes including calcium, chloride, citric acid, creatinine, magnesium, oxalate, pH, phosphorus, potassium, sodium, and uric acid. These components help in identifying the concentrations of stone-forming substances in the urine, providing data relevant to stone formation prevention and management.
Special Instructions
Thoroughly mix the entire 24-hour urine collection in one container. Transport four separate 4 mL aliquots of urine, using the specified Calculi Risk/Supersaturation Urine Collection Kit if available. Follow precise instructions for aliquoting, freezing, and transporting the specimens. Record total volume and collection time interval on the transport tube and test request form.
Limitations
This profile does not include testing for magnesium ammonium phosphate (struvite) or cystine calculi. It is developed for assessment of stone-forming conditions like hypercalciuria, hyperuricosuria, and hyperoxaluria. It does not account for struvite stones associated with bacterial infections or cystine calculi linked to hereditary cystinuria, where other specific tests are recommended.
New York Approved
Methodology
Automated Analyzer
Biomarkers
LOINC Codes
- 35678-2
- 35677-4
- 35676-6
- 35675-8
- 6874-2
- 35674-1
- 2162-6
- 30922-9
- 24447-5
- 35673-3
- 2779-7
- 3086-6
- 3087-4
- 6687-8
- 2128-7
- 2701-1
- 27222-9
- 2956-1
- 2829-0
- 2079-2
- 19153-6
- 30211-7
- 2756-5
- 11502-2
Result Turnaround Time
1-7 days
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
24-hour urine
Minimum Volume
4 mL per aliquot
Container
Calculi Risk/Supersaturation Urine Collection Kit or alternative tubes as specified
Collection Instructions
Collect 24-hour urine, mix thoroughly, and immediately freeze in specified aliquots.
Patient Preparation
None specified, but ensure complete 24-hour collection.
Storage Instructions
Critical frozen, ensure specimens remain frozen during transport.
Causes for Rejection
No information provided.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | Unacceptable |
| Refrigerated | Unacceptable |
| Frozen | 2 weeks |