Test Overview
Test Methodology

Carboxyhemoglobin-Co-oximetry

Test Usage

Verifying CO toxicity in cases of suspected exposure.

Reference Range *

Normal Concentration: Non-smokers: 0 - 2%; Smokers: <or= 9%. Toxic Concentration: >or= 20%.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Monday - Friday
Analytic Time

1 - 2 days

Soft Order Code
CO2B
MiChart Code
Carbon Monoxide, Blood
Synonyms
  • Carboxyhemoglobin, Blood
  • CO
  • CO2B
  • Carboxy Hemoglobin
Laboratory
Sendout
Reference Laboratory
Mayo COHBB (8649)
Section
Special Testing
Specimen Requirements
Collection Instructions

Collect specimen in lavender top tube. Send intact specimen refrigerated or at room temperature. Avoid exposure of sample to atmosphere.

Lavender Top Tube
Normal Volume
1 mL EDTA whole blood
Minimum Volume
0.1 mL EDTA whole blood
Additional Information

Carbon monoxide (CO) poisoning causes anoxia because CO binds to hemoglobin with an affinity 240 times greater than that of oxygen, thus preventing delivery of oxygen to the tissues. Carboxyhemoglobin diminishes at the rate of about 15% per hour when the patient is removed from the contaminated environment. Significant levels of carboxyhemoglobin can be found in heavy smokers. Test is sent to Mayo Medical Laboratories.

Billing
CPT Code
82375
Fee Code
32069
LOINC
20563-3
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