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| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Blood Urea Nitrogen
Test CodeBUN
CPT Codes
84520
Preferred Specimen
GREEN Lithium Heparin Plasma
Minimum Volume
0.25 mL
Other Acceptable Specimens
SST Serum Separator, Red No Gel
Instructions
Separate from cells within 4 hours of collection
Transport Container
GREEN Lithium Heparin
Transport Temperature
Room Temperature
Specimen Stability
Room Temp: 24 Hours; Refrigerated: 5 Days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Not separated from cells within 4 hours of collection, gross hemolysis
Methodology
Vitros 7600/3400
Reference Range
Female: 7-17 mg/dL; Male: 9-20 mg/dL
Clinical Significance
The major pathway of nitrogen excretion is in the form of urea that is synthesized in the liver, released into the blood, and cleared by the kidneys. A high serum urea nitrogen occurs in glomerulonephritis, shock, urinary tract obstruction, pyelonephritis, and other causes of acute and chronic renal failure. Severe congestive heart failure, hyperalimentation, diabetic ketoacidosis, dehydration, and bleeding from the gastrointestinal tract elevate urea nitrogen. Low urea nitrogen often occurs in normal pregnancy, with decreased protein intake, in acute liver failure, and with intravenous fluid administration
Performed By
RFGH Laboratory
Performing Laboratory
RFGH Laboratory
