Days Set Up
Monday - Friday
Analytic Time

1 - 2 days

MiChart Code
Carbon Monoxide, Blood
Soft Order Code

Test Updated:


Carboxyhemoglobin, Blood
Carboxy Hemoglobin

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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Test Overview

Test Methodology


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.

Specimen Requirements

Collection Offsite

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

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.