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Vanderbilt Pathology Laboratory Services

Test Directory



UREA NITROGEN 24 HR URINE (TUN)

Department: Chemistry
Test Synonym(s): TUN
CPT Codes: 84540
Methodology: Enzymatic Hydrolysis
Reference Range: 0-150 yrs: 6 - 20 g/day
Tube Type: 24 hour urine container - plain
Specimen: 24 hour urine- total 24 hour collection
Volume: 50 mL urine
Minimum Volume: 15 mL urine
Temperature: See Special Instructions.
Stability: <3 days at 2-8 degrees C; freezing is not recommended
Days Performed: Daily
Times Performed: Continuous
Special Instructions: Refrigerate during 24 hour collection to prevent bacterial growth, which will lowers BUN content.

Click here to print the 24 Hour Urine Collection Guide.

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