What is the standard normal range for Carbon Dioxide (CO2) levels?

• A. 30-40
• B. 35-45
• C. 40-50
• D. 45-55

Answer: (B)

The standard normal range for Carbon Dioxide (CO2) levels in the blood is considered to be between 35 and 45 mmHg. This range is important because CO2 levels are a key component in assessing respiratory function and acid-base balance in the body. Within this range, the body effectively regulates pH and maintains homeostasis.

When CO2 levels are within this normal range, it indicates that the body is appropriately managing carbon dioxide production and elimination through respiration. Values below 35 mmHg suggest hyperventilation or excessive removal of CO2, while values above 45 mmHg indicate hypoventilation or inadequate removal of CO2, which can lead to respiratory acidosis. Understanding this normal range is crucial for interpreting arterial blood gases and managing patients effectively in clinical settings.