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HelpTest Code LAB140 Blood Urea Nitrogen
Performing Laboratory
Asante Rogue Regional Medical Center / Asante Three Rivers Medical Center / Asante Ashland Community Hospital / Asante White City Laboratory
Specimen Minimum Volume
0.5 ml
Billing Code
2050169
Methodology
Enzymatic Conductivity Rate
Specimen Requirements
Lithium Heparin Green top tube
Required volume 0.5 ml
Outpatient clients MUST draw SST
Performing Department
Chemistry
Day(s) Test Set Up
Monday through Sunday
Routine – same day
ASAP – 2 hours after receipt of specimen in lab
STAT – 1 hour after receipt of specimen in lab
Test Classification and CPT Coding
84520 - Urea nitrogen; quantitative
Additional Information
The most common cause of increased blood urea nitrogen (BUN) is
inadequate excretion, usually due to kidney disease or urinary
obstruction. Blood loss into the gastrointestinal tract may
also cause elevations. Borderline high values may occur after
recent ingestion of high protein meal. Low BUN occurs in
normal pregnancy, decreased protein intake, with intravenous
fluids, with some antibiotics and in some, but not all,
instances
of liver disease.
Specimen Transport Temperature and Stability
Centrifuge and refrigerate within 2 hours of
collection.
Spun SST is stable for 48 hours at 2° to 8° C.
Reasons for Rejection
Hemolysis
Quantity not sufficient (QNS)
Lack of Two Patient Identifiers:
1-Patient's First & Last name
2-Patient's Date of Birth