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Test Code BUNF or LAB2768 Urea Nitrogen, Body Fluid

Specimen Requirements

Container Type:

Sterile Container: 
Optimal Collection Volume: 

20 mL
Minimum Volume:

5 mL
Collection Instructions:
  • Use an aseptic aspiration technique
  • Include source of specimen on the collection tube
Specimen Transport:

Refrigerate
Processing Instructions: 

1. Pour off an aliquot from the sterile container

2. Spin the aliquot in a centrifuge

3. Deliver the aliquot to the chemistry department

Specimen Stability

Specimen Type Temperature Time
Body Fluid Refrigerated 7 days

Specimen Rejection Criteria

Gross hemolysis

Useful For

Identifying the presence of urine as a cause for the accumulation of fluid in a body compartment.

 

Assessing the adequacy of peritoneal dialysis treatment protocols.

Methodology

Roche Cobas - Kinetic test with urease and glutamate dehydrogenase

Reference Ranges

No reference range established

Interpretive

UEBF - Clinical & Interpretive: Urea Nitrogen, Body Fluid (mayocliniclabs.com)

Day(s) Performed

24/7

Expected TAT

Same day

Performing Laboratory

Bronson Laboratory, Chemistry - Kalamazoo and Battle Creek

Sample Retention Time

7 days

CPT Code

84520

LOINC Code

3093-2