What is the normal PaCO2 range for an adult?

What is the normal PaCO2 range for an adult?

• A. 25-35 mmHg
• B. 30-40 mmHg
• C. 35-45 mmHg
• D. 40-50 mmHg

Answer: (C)

Normal PaCO2 reflects how effectively the lungs are ventilating to remove carbon dioxide. In a healthy adult, the arterial partial pressure of CO2 is typically 35 to 45 mmHg. This range represents a balance between CO2 production in tissues and its elimination by the lungs. Values above 45 indicate hypoventilation and a tendency toward respiratory acidosis, while values below 35 indicate hyperventilation and a tendency toward respiratory alkalosis. A common reference point is around 40 mmHg, but the acceptable normal range is 35–45 mmHg. When interpreting ABGs, compare PaCO2 with the pH to determine the primary disturbance and whether compensation is present.

Normal PaCO2 reflects how effectively the lungs are ventilating to remove carbon dioxide. In a healthy adult, the arterial partial pressure of CO2 is typically 35 to 45 mmHg. This range represents a balance between CO2 production in tissues and its elimination by the lungs. Values above 45 indicate hypoventilation and a tendency toward respiratory acidosis, while values below 35 indicate hyperventilation and a tendency toward respiratory alkalosis. A common reference point is around 40 mmHg, but the acceptable normal range is 35–45 mmHg. When interpreting ABGs, compare PaCO2 with the pH to determine the primary disturbance and whether compensation is present.