Capillary blood gas samples should not be used to measure which of the following?
1. Partial pressure of arterial carbon dioxide (PaCO2)
2. Partial pressure of arterial oxygen (PaO2)
3. pH
4. Hemoximetry oxygen saturation (SaO2)
a. 1 and 3 c. 1 and 4
b. 2 and 4 d. 1 and 2
ANS: C
The correlation between capillary and arterial pH and partial pressure of carbon dioxide (PCO2) measurements is better than the correlation between capillary and arterial partial pressure of oxy-gen (PO2) measurements. Consequently, capillary blood gases are more often used to discern ac-id-base balance rather than to assess a patient's oxygenation status.
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