Why Should the Pulse Oximeter Not Be Used to Assess

question 11

Multiple Choice

Why should the pulse oximeter not be used to assess HbO₂ concentration in carbon monoxide poisoning?

• A)O₂ and CO have similar light-absorption spectra and thus give a falsely high value for HbO₂
• B)Because of any methemoglobin that might be present
• C)Intravascular dyes for diagnostic purposes make the oximeter inaccurate
• D)Because CO prevents the oximeter from reading oxygen

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