What does a PaCO2 of 48 indicate?

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Multiple Choice

What does a PaCO2 of 48 indicate?

Explanation:
A PaCO2 of 48 mmHg is outside the normal range (about 35–45 mmHg) and points to a respiratory component in acid-base balance. Higher CO2 means ventilation is insufficient, which pushes the system toward respiratory acidosis. So, the value is abnormal and, in the typical interpretation, indicates an acidotic tendency. To confirm actual acidemia you'd also check the pH (low pH confirms acidemia; normal pH with elevated PaCO2 could be a compensated respiratory acidosis, depending on bicarbonate). The other descriptions don’t fit because the CO2 is not normal and not low; learning to connect PaCO2 with acid-base status hinges on recognizing that elevated CO2 signals a respiratory disturbance toward acidosis.

A PaCO2 of 48 mmHg is outside the normal range (about 35–45 mmHg) and points to a respiratory component in acid-base balance. Higher CO2 means ventilation is insufficient, which pushes the system toward respiratory acidosis. So, the value is abnormal and, in the typical interpretation, indicates an acidotic tendency. To confirm actual acidemia you'd also check the pH (low pH confirms acidemia; normal pH with elevated PaCO2 could be a compensated respiratory acidosis, depending on bicarbonate). The other descriptions don’t fit because the CO2 is not normal and not low; learning to connect PaCO2 with acid-base status hinges on recognizing that elevated CO2 signals a respiratory disturbance toward acidosis.

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