A patient is referred for arterial blood gas testing.She has an SpO2 of 84% by pulse oximetry,but blood oximetry reveals an SaO2 of 94%.Which of the following best explains the difference between results?
A) The patient may be severely anemic (Hb less than 8 g/dl) .
B) The patient may have respiratory alkalosis (hyperventilation) .
C) The patient may have an elevated COHb level.
D) The pulse oximeter reading may have been in error.
Correct Answer:
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