Urea Nitrogen, 24-Hour Urine without Creatinine
Also known as: BUN, Nitrogen Balance, Nitrogen, Urea, 24-Hour Urine
Use
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
Aliquot from a well‑mixed 24‑hour urine collection; record total volume on both the specimen container and the test request form; refrigeration during and after collection; preserved urine (pH < 4 with 6 N HCl) may be shipped at room temperature; setup daily; report available in 1‑3 days.
Limitations
Not provided.
Methodology
Automated Analyzer (Other)
Biomarkers
Result Turnaround Time
1-3 days
Related Documents
For more information, please review the documents below
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 |
Other tests from different labs that may be relevant