Carbon Monoxide (Carboxyhemoglobin)

For Specimen Integrity during Extreme Weather see the “Lockbox Usage in Extreme Weather” document at the top of this page.

Specimen must be collected at Miami Valley Hospital PSC or Miami Valley Hospital South PSC due to specimen handling and short specimen stability window.

Test Code

Alias/See Also
Carbon Monoxide;

CPT Codes

Preferred Specimen
3 mL whole blood Sodium Heparin (dark green top) tube.

Minimum Volume
1 mL

After specimen collected invert tubes 8 - 10 times, then transport tube on wet ice slurry to MVH or MVHSouth laboratory within 1 hour.

Transport Container
Sodium Heparin (dark green top) tube

Transport Temperature
Transport on ice slurry to laboratory within 1 hour.

Specimen Stability
1 hour on ice slurry
Room Temperature = n/a
Refrigerated = n/a
Frozen = n/a

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis, Lipemia, incorrect specimen type, insufficient sample volume, improper storage conditions, exceeds specimen stability guidelines, contaminated sample.

ion selective electrode

Setup Schedule

Report Available
1 hour from receipt

Reference Range
SEX AGE Report Normals Units
N/M/F 133Y Smokers: 1.5 - 5.0%  
    Non-Smokers: < 1.5%  
    Potentially Toxic: > 10%   

Clinical Significance
Carbon monoxide is the most common of the gaseous poisons.  Malfunctioning or poorly ventilated heating appliances and internal combustion engines are frequent causes of carbon monoxide poisoning. Carbon monoxide combines reversibly with hemoglobin in a manner almost identical to oxygen resulting in a decrease in the amount of oxygen carried by hemoglobin. Accidental poisoning can occur even at low levels (greater than 0.01%) of CO in the atmosphere with prolonged exposure.

Performing Laboratory
CompuNet Clinical Laboratories, LLC
2308 Sandridge Drive
Moraine, OH 45439

Last Updated: November 19, 2021

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.