Test Name

BUN

Test Code

2059

Unit

mg/dL

Station

Chemistry

Synonym Name/Abbreviation

Blood Urea Nitrogen

CPT Code

84520

Performing Facility

American Medical Labs, Herzliya
Pituah

Analyzer

Roche cobas 6000

Test Method

Enzymatic

AML Preferred Tube

5 mL SST gel

Storage Instructions

Refrigerated.

Separate serum from cells within 45
minutes.
Stability:
7 days at 15 to 25^oC.
7 days at 2 to 8^oC
1 year at -25 to -15^oC

Min. Volume

1 mL

Turn-Around-Time

One day

Intended Use

Evaluation of the renal function. With creatinine, BUN is
used to monitor patients on dialysis.
Low results in normal pregnancy;
decreased protein intake and with some antibiotics.

but not all instances of liver disease.
High BUN occurs
in chronic glomerulonephritis, pyelonephritis and other causes of chronic
renal disease; with acute renal failure, decreased renal perfusion as in
shock; Borderline high values may occur after recent ingestion of high
protein meal. Muscle wasting may cause an elevation as
well.

Limitations

Uremia is best evaluated with creatinine as well as urea
nitrogen.   Although
creatinine is generally considered a more specific test to evaluate renal
function, they are commonly used
together.

Patient Preparation

No patient preparation
needed

Reasons for Rejection

Improper labeling.

Adult Reference Ranges

5 to 23 mg/dL