Test Directory

Urea Nitrogen, Urine, 24 hr

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Updated Test Information:

Test Description
Urea Nitrogen, Urine, 24 hr
Test ID
Specimen Type
Alternate Specimen Type
Specimen Requirements
Urine, 24 hour collection
Specimen Collection / Processing Instructions
Urine, 24 hour collection - Refrigerate the specimen as it is collected.Instruct the patient to void at 8 AM and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period (ie, 8 AM the next morning). Screw the lid on securely. Container must be labeled with patient's full name, date and time collection started, and date and time collection finished.
2 days at 20-25 ˚C
7 days at 4-8 ˚C
1 month at -20 ˚C
Unacceptable Specimen Conditions
Bacterial growth in the specimen and high atmospheric ammonia concentrations as well as contamination by ammonium ions may cause erroneously elevated results.
Kinetic/Enzymatic (urease)
Estimated TAT
0-2 days
Testing Schedule
CPT Code(s)
Minimum Sample Volume
10 ml aliquot of entire collection
Pediatric Min. Volume (if applicable)
1 ml
Reference Range
24 hr Urine: 12 - 20 g/24h
Performing Lab
Incyte Diagnostics
LOINC Code(s)