Test Code 8129 Urea Nitrogen (Urine)
Purpose
Assessment of protein intake and/or nitrogen balance.
Performing Laboratory
Copley Hospital
Methodology
Bichromatic Rate
Specimen Requirements
Specimen Type: Urine (24-Hour)
Container/Tube: Plastic Container
Specimen Volume: Entire 24-Hour Collection
Collection Instructions:
1. For 24 Hour Urines: Refrigerate during collection
and follow instructions for “24 Hour Urine Collection”
under “Specimen Collection and Handling” within the
links menu on the left side of the screen.)
2. Label specimen with patient’s full name, date of birth,
date & time of collection (Both Start & End Times for
24-Hour Urines) and person collecting.
3. Refrigerate specimen during transport.
Reference Values
Normal: 7 - 20 g / 24 Hours
Stability
Refrigerated: 3 Days
Day(s) Performed
Daily
Analytical Time: 1 Day
Aliases
Urea Nitrogen
BUN
Test Classification & CPT Coding
81050 - Urine Timed Measurement
84540 - Urea Nitrogen