Casandra
Casandra Test Code QD06226Version 1 (DRAFT)
Performing Lab
Urea Nitrogen, 24-Hour Urine without Creatinine
Also known as: BUN, Nitrogen Balance, Nitrogen, Urea, 24-Hour Urine
Clinical Use
Order TestUse
This quantitative urea nitrogen test, performed with a 24‑hour urine specimen, may help estimate nitrogen balance and determine protein needs in patients who are critically ill or receiving intravenous nutritional support.
Special Instructions
Not provided.
Limitations
Not provided.
Test Details
Methodology
Automated Analyzer (Other)
Biomarkers
Urea Nitrogen, 24 Hr Ur
AnalyteQuantitative value
Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)
Result Turnaround Time
1-3 days
Related Documents
For more information, please review the documents below
Specimen Requirements
Specimen
Urine
Volume
10 mL
Minimum Volume
2 mL
Container
Plastic screw‑cap container
Collection Instructions
24‑hour urine collection; record total volume on test request form and urine vial; refrigerate during and after collection; aliquot from well‑mixed 24‑hour collection; preserved urine (pH < 4 with 6 N HCl) may be shipped at room temperature
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 24 hours |
| Refrigerated | 7 days |
| Frozen | 15 months |
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