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Carboxyhemoglobin (COHb)

Specimen Type
Test ID   LAB56
EPIC Order
CPT Code(s)   82375
Group/Individual Test   Individual
Laboratory   Core Laboratory-Blood Gas
Tube Station   31
Specimen Routine: 1 mL whole blood in 3cc Syringe w/lyophilized Heparin in BG Kit, SafePICO syringe, or Green top heparin tube;  See Important Comments
  micro: 0.5 mL whole blood in  syringe w/lypholized heparin in BG kit.
Availability Routine: 24 Hours/Day
  STAT: Yes
    10 minutes
Reference Range Normal: See Table Below
  Critical: >20%
  • Deliver Immediately.
  • Samples should be delivered to the laboratory for testing within 30 minutes of collection.  Samples are acceptable up to 24 hrs (whole blood; do not freeze).
  • Syringes with needles attached will NOT be accepted.

Reference Ranges: Caroboxyhemoglobin (effective 2/16/2005)

Non-Smoker Avg. Smoker Heavy Smoker
0.0-1.5% 4-5% 6-8%

Reviewed by jcayless on December 11, 2019

Note: Reference ranges provided on this web site are for guidance only, and may not reflect the most recent changes. Refer to laboratory reports for current reference data.

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514