Urea Nitrogen
| Order Code: | BUN |
| Order Form: | Laboratory Requisition |
Specimen:
Plasma
Collection Medium:
 |
| Plasma Separator Tube |
Alternate
Collection Media:
Call laboratory for additional acceptable specimen collection containers.
Minimum:
3 mL whole blood in light green top tube or ONE microtainer for
pediatric patients.
Testing
Schedule:
24 hrs/day, 7 days a week, including holidays.
Analytic Time:
1 hour (upon receipt in laboratory)
Reference Range:
10-20 mg/dL
Test
Limitations:
Criterion: Recovery within plus or minus 10% of initial values.
Plasma
Icterus: No significant interference up to an I index of 60
(approximate conjugated and unconjugated bilirubin concentration: 60
mg/dL).
Hemolysis: No significant interference up to an H index of 1000
(approximate hemoglobin concentration: 1000 mg/dL)
Lipemia (Intralipid): No significant interference up to an L index of
1000 (approximate triglycerides concentration: 2000 mg/dL). There is
poor correlation between turbidity and triglycerides concentration.
Great care must be taken to prevent ammonia contamination of the
specimens to be analyzed for urea/urea nitrogen.
Methodology:
Enzymatic
Sample
Processing:
Centrifuge at 3000 RPM for 10 minutes.
Aliquot plasma into labeled container and cap.
Aliquot plasma into labeled container and cap.
Sample
Storage:
Room temperature or refrigerate if stored overnight.
Transport
Instructions:
Place specimen into zip-lock type bag, seal bag.
Place requisition into outside pocket of bag.
Ship ambient or refrigerate.
Place requisition into outside pocket of bag.
Ship ambient or refrigerate.
CPT Code:
84520
See also:
Urea Nitrogen-Other, Body Fluid (e.g., surgical drain, pericardial, peritoneal, peritoneal dialysis, pleural, or synovial)
Urea Nitrogen-Other, Body Fluid (e.g., surgical drain, pericardial, peritoneal, peritoneal dialysis, pleural, or synovial)