BUN (Blood Urea Nitrogen)

SIM

10580 

CPT

84520 

Synonyms

BUN 

Specimen Type

Plasma or serum 

Container

3.5 ml Green - Lithium heparin plasma separator 
4.0 ml Gold-top serum separator

Collection Instructions

None

Volume

2 ml plasma or serum 
Min: 0.5 ml

Additional Information

None

Patient Preparation

None

Specimen Processing Instructions

Plasma:  Centrifuge at 3380 rpm’s (±100) for a minimum of 10 minutes

Serum:  Allow to clot.  Centrifuge at 3380 rpm’s (±100) for a minimum of 10 minutes

Centrifuge within 2 hours of collection.

Transport Requirements

Refrigerated

Specimen Stability

Room temperature:  8 hours   Refrigerated: 5 days 

Rejection Criteria

•  If not centrifuged within 2 hours of collection. 
•  Gross Hemolysis

Reference Range

7 - 25 mg/dL

Critical Value

None 

Test Includes

BUN 

Methodology

Enzymatic Conductivity Rate Method 

Testing Frequency

Daily, Monday - Sunday 

Reviewed By

Crystal Killian

Reviewed Date

3/17/2021

Supplemental