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Test Code CRBXY Carboxyhemoglobin LAB56

Test Method

Photometry; Instrumentation Laboratory

Specimen Requirement

0.5 mL lithium heparin whole blood collected in a syringe is required.

Additional Specimen Collection Information

Collect blood in a lithium heparinized plastic syringe.

Reference Values

Carboxyhemoglobin: 8.5-10.5 mg/dL

Nonsmoker: ≤ 3.0%

Smoker: < 9.0%

  • Critical Value: ≥  20.0%


Testing is performed Monday through Sunday.

Routine: Typically completed within 4 hours after the
specimen arrives at the testing site.

STAT: Typically completed within 30 minutes after the specimen
arrives at the testing site.

Useful For

Verifying carbon monoxide toxicity in cases of suspected

LOINC Code Information

20563-3 Carboxyhemoglobin/Hemoglobin.Total In Blood



CPT Code Information

82375 Chemistry: Carboxyhemoglobin (Carbon Monoxide);
Carboxyhemoglobin; quantitative