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 Field Name  Data Description
Test Name  Urea Nitrogen ( Urine Urea Nitrogen)
Code  UUN or UUN-T
CPT Code  84520
Last Modified  4/20/2023 1:03:00 PM
Test Name  Urea Nitrogen ( Urine Urea Nitrogen) (3251)
Patient Preparation  
Spec. Requirements  Urine
Tube  Random or 24 hr.
Collection Volume  3 mL aliquot of original collection.
Storage  See Special Handling
Routine TAT  4 hours
STAT TAT  50 min
Days Test Performed  Daily
Performed by BHS  All Hospitals
See Availability  All shifts
Reference Lab  N/A
Reference Lab Code  
Clinical Use  Used in the treatment and diagnosis of certain renal and metabolic diseases.
Reference Range  24 hour urine: 7 - 16 g/24 hr Random urine: No reference range established
Critical Value  
Component  UUN (24-Hr)
Reference Range  7-16 gm/24 hrs
Critical Value  
Component  UUN (Random)
Reference Range  No established range
Critical Value  
Testing Sample Type  Urine
Min Lab Testing Volume  0.5 (0.2) mL
Special Handling  Keep 24 hour collection on ice/refrigerated during collection. Plasma/Serum Stability: Ambient -7 Days; 2-8C - 7 Days;-20C - 1 year Urine Stability: Perform assay within 2 hours of collection.
Lab Notes  Measure and record urine 24 total volume in LIS before aliquoting specimen. No preservative is needed.
Methodology  ENZ - Enzymatic

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