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Urea Nitrogen Timed Urine
Test CodeLAB449
Alias/See Also
UUN, 24 Hour Urine; Urea Nitrogen, 24 hour Urine
CPT Codes
84540
Preferred Specimen
24 hour urine container
Minimum Volume
1mL aliquot of 24 hour urine
Instructions
Collection container is to be kept in a refrigerator or on ice during collection.
Transport Temperature
Refrigerated
Specimen Stability
5 days refrigerated
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Bilirubin: >20 mg/dL, Hemoglobin: >500 mg/dL, Lipemia: >500mg/dL
Methodology
Enzymatic conductivity rate
Setup Schedule
Mon- Sun
Reference Range
6-17 g/24 hours
Clinical Significance
Measurements of urea nitrogen are used in the diagnosis and treatment of certain renal and metabolic disorders
Performing Laboratory
Piedmont Athens Regional