NBRC Normal Values TMC Practice Test

Normal arterial PCO2 range is?

25-35 mmHg 35-45 mmHg 45-55 mmHg 15-25 mmHg

Correct Answer:

35-45 mmHg

Explanation:

Normal arterial PCO2 is determined by the balance between CO2 production and elimination by the lungs. The body keeps PaCO2 within a narrow window, about 35 to 45 mmHg, to maintain stable acid-base status. Values in this range indicate adequate ventilation. If PaCO2 drops below 35, hyperventilation occurs and can lead to respiratory alkalosis; if it rises above 45, hypoventilation occurs and can cause respiratory acidosis. The 35–45 mmHg range is the standard normal range, while lower ranges reflect hypocapnia and higher ranges reflect hypercapnia.

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