Discussion
Carboxyhaemoglobin saturation is the measure of
Answer: B
Correct answer: Haemoglobin bound to carbon monoxide
Carboxyhaemoglobin saturation is the percentage of the blood's haemoglobin that is bound to carbon monoxide rather than to oxygen. It is the standard measure of internal dose, because it reflects what has actually reached the bloodstream rather than what was present in the air.
Carbon monoxide binds haemoglobin some 200 to 250 times more strongly than oxygen does, so even a few parts per million in air produce a measurable saturation. The result is reduced oxygen carriage, felt first as headache and impaired judgement, and dangerous at higher levels.
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