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Test ID BUN Blood Urea Nitrogen (BUN), Serum

Useful For

Screening test for evaluation of kidney function

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Serum


Necessary Information


Patient's age and sex are required.



Specimen Required


Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL

Collection Instructions:

1. Serum gel tubes should be centrifuged within 2 hours of collection.

2. Red-top tubes should be centrifuged, and the serum aliquoted into a plastic vial within 2 hours of collection.


Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 7 days
  Frozen  365 days

Reference Values

Males

1-17 years: 7-20 mg/dL

≥18 years: 8-24 mg/dL

Reference values have not been established for patients who are <12 months of age.

 

Females

1-17 years: 7-20 mg/dL

≥18 years: 6-21 mg/dL

Reference values have not been established for patients who are <12 months of age.

Day(s) Performed

Monday through Sunday

CPT Code Information

84520

Report Available

Same day/1 to 2 days

Reject Due To

Gross hemolysis OK

Forms

If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:

-Kidney Transplant Test Request

-Renal Diagnostics Test Request (T830)