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UREA NITROGEN 24HR URINE
Test CodeUBUN24
Alias/See Also
UUN24
CPT Codes
84540
Preferred Specimen
Well mixed aliquot of a 24-hour urine specimens. No preservative needed. Indicate total volume, start date time and end date time on requisition. Refrigerate specimen during collection.
Minimum Volume
1.0 mL
Instructions
No preservative needed. Refrigerate during collection. If sending an aliquot mix sample well before transferring to a sterile transport container. Indicate total volume, start date time and end date time on requisition. Refrigerate specimen during collection.
Specimen Stability
Room Temperature:
Urine 2 days at 15-25°C
Refrigerated:
Urine 7 days at 2-8°C
Frozen:
Urine 1 months at -20°C
Urine 2 days at 15-25°C
Refrigerated:
Urine 7 days at 2-8°C
Frozen:
Urine 1 months at -20°C
Methodology
Kinetic
Setup Schedule
Mon-Sun
Report Available
Same day
Reference Range
Urine
7 - 20 g/24hr (24 hr urine)
7 - 20 g/24hr (24 hr urine)
Clinical Significance
About 80% of urinary nitrogen is in the form of urea which is the major end product of protein metabolism. Urea excreted in the urine is the primary method of nitrogen elimination. Conditions associated with increased urine urea nitrogen are hyperthyroidism, high protein diets and post-operative states. Decreased levels are associated with convalescence, liver disease, toxemia and advanced renal disease.
Performing Laboratory
Frederick Health Laboratory
400 West 7th St.
Frederick, MD. 21701
Last Updated: March 27, 2019
