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Carboxyhemoglobin Blood

Order Code CH708
Turnaround Time 24-48 hours
Test Includes


Specimen Requirements
Specimen Source
Whole blood
Transport Container
(Specimen Container)

EDTA (lavender-top) tube Alternative Specimen(s): Whole blood collected in Sodium heparin (green-top) tube or lithium heparin (green-top) tube

Preferred Specimens
Whole blood collected in 1 full EDTA (lavender-top) tube
Minimum Volume (uL)
0.5 mL from full EDTA tube
Collection Instructions
(Transport Temperature)
Transport at Room Temperature
Specimen Stability
Temperature Period
Room temperature 5 days
Refrigerated 10 days
Frozen Unacceptable
Reject Criteria

Fluoride oxalate (gray-top) tube
Grossly clotted

Special Instructions

Keep tube closed

Test Details
Spectrophotometry (SP)
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.

Reference Ranges

See Laboratory Report