Test Code 24UN Urea Nitrogen, Urine
Performing Laboratory
MaineGeneral Medical Center
Reference Values
12 - 20 mg/24 hours
Day(s) Test Performed
Monday through Sunday
Specimen Requirements
2 mL from a 24-hour urine collection. No preservative. Mix well before taking 2-mL aliquot. (An entire 24-hour urine collection is also acceptable.) Refrigerate specimen during collection, and send specimen refrigerated in plastic urine container.
See “Urine Collection” in “Special Instructions” for 24-hour specimens.
Label specimen with patient’s name (first and last), date of birth, date and time of collection, and collector’s initials.
Specimen stability: Should be tested as soon as possible.
Minimum volume: 2 mL
Test Classification and CPT Coding
84540 - urea nitrogen
81050 - urine timed measurement (if appropriate)