Jan 8, 2018




Clinical Hub,Tools & Resources,UWHC Lab Test Directory,Chemistry


BUN (BUN) Chemistry Lab Test

Name: BUN

Test Name: BUN

Health Link Test Code: BUN

LIS Test Code: BUN

CPT Code(s): 84520

Included In: Basic Metabolic Panel, Comprehensive Metabolic Panel

Methodology: Urease

Days Performed: Daily, 24 hours.

In-Lab Turnaround Time: 4 hours.

Stat In-Lab Turnaround Time: 1 hour.

Specimen: Blood

Collection Container: Green cap with yellow ring (PST)

Also Acceptable: Green top, Red cap with yellow ring (SST), Red top

Collection Volume: 1 mL

Pediatric Collection Volume: 0.4 mL

Stability Ambient:

7 days

Stability Refridgerated:

7 days

Stability Frozen:

1 year

Sample Analyzed: Plasma or serum

Testing Volume: 0.5 mL

Pediatric Testing Volume: 0.2 mL

Specimen Processing:

Centrifuge. If a complete barrier has not formed, transfer cell-free plasma/serum to plastic vial. Refrigerate.

Specimen Transport:

Transport specimen to the laboratory. Transport with coolant pack if coming from clinic location.




1-3 years 5-17
4-13 years 7-17
14-19 years 8-21
20 years and up

male: 9-20

female: 7-19


Interpretation Type: Reference Interval

Critical Calls: yes