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Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct? The patient has been inhaling polluted air containing unusually high content of

1. carbon disulphide
2. chloroform
3. carbon dioxide
4. carbon monoxide

Correct answer: carbon monoxide

Solution

Carboxyhemoglobin is hemoglobin bound to carbon monoxide, not carbon dioxide. A high level of this complex strongly suggests exposure to polluted air containing carbon monoxide.

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