Urea Nitrogen Timed Urine

Test Code
LAB449


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



The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.