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Test Code 24UN Urea Nitrogen, Urine

Important Note

24-Hour urine volume is required on the request form for processing.

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)

Special Instructions