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Test Code CRBXY Carboxyhemoglobin, LAB56


Broad Spectrum Spectrometer Technology

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Heparinized Dark Green tube, whole blood

Acceptable: Heparinized syringe, whole blood

                      Cadaver blood also may be used for analysis.

Specimen Volume: 150 uL lithium heparin whole blood

Stability: Carboxyhemoglobin is stable in a refrigerated stored blood sample for several months.


Reference Values

Nonsmokers: 0.5-3.0%
Smokers: 1.5-9.0%

Critical value: >20%

Results ≥10% are reported to the Iowa Disease Surveillance System

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding


Useful For

Useful in the diagnosis of carbon monoxide poisoning.