UR 24Hr Urea Nitrogen (TUN)

Department: Chemistry
Test Synonym(s): LAB3085, TUN, Urea Nitrogen 24 Hr Urine, U24BUN
CPT Codes: 84540
Methodology: Urease
Reference Range: 0-150yrs: 12-20 g/day
Tube Type: 24 hour urine container - plain (no additive)
Specimen: 24 hour urine- total 24 hour collection
Volume: 50 mL urine
Minimum Volume: 24 hour urine collection
Temperature: See Special Instructions.
Stability: Room temperature: 2 days; Refrigerated: 7 days; Frozen: 30 days
Days Performed: Daily
Times Performed: Continuous
Special Instructions: Refrigerate during 24 hour collection to prevent bacterial growth, which will lowers BUN content. Label with beginning and ending collection times and dates- indicate total volume if an aliquot is sent. Mix specimen.

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