Carboxyhemoglobin (COHb)

Carboxyhemoglobin (COHb) is a topic covered in the Guide to Diagnostic Tests.

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Test/Range/Collection

Carboxyhemoglobin, whole blood (COHb, %)

<2% [non-smokers]

<9% [smokers]

Blood gas syringe or green

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Specimen should be collected before treatment with oxygen is started.

Do not remove stopper or cap. Refrigerate within 30 min after collection, if needed.

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