A patient with COPD will typically demonstrate which of the following on blood gas analysis?

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Multiple Choice

A patient with COPD will typically demonstrate which of the following on blood gas analysis?

Explanation:
COPD causes chronic CO2 retention due to impaired ventilation, leading to respiratory acidosis. Over time the kidneys compensate by increasing bicarbonate, so you often see elevated bicarbonate along with high CO2. The acidemia from the retained CO2 means the blood pH is decreased. Among the given options, a lowered pH directly reflects the acid-base disturbance from CO2 retention and is the most direct indicator of the problem, even though bicarbonate may be elevated as compensation. The other findings point to the compensatory changes or irrelevant metrics (like hemoglobin) and don’t define the immediate acid-base status as clearly.

COPD causes chronic CO2 retention due to impaired ventilation, leading to respiratory acidosis. Over time the kidneys compensate by increasing bicarbonate, so you often see elevated bicarbonate along with high CO2. The acidemia from the retained CO2 means the blood pH is decreased. Among the given options, a lowered pH directly reflects the acid-base disturbance from CO2 retention and is the most direct indicator of the problem, even though bicarbonate may be elevated as compensation. The other findings point to the compensatory changes or irrelevant metrics (like hemoglobin) and don’t define the immediate acid-base status as clearly.

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