What is the normal range for PACO2 in arterial blood?

The normal range for PACO2, or the partial pressure of carbon dioxide in arterial blood, is 35-45 mmHg. This range is crucial for maintaining acid-base balance in the body. PACO2 levels provide insight into respiratory function; levels above 45 mmHg can indicate hypoventilation or respiratory acidosis, while levels below 35 mmHg may suggest hyperventilation or respiratory alkalosis. Understanding this normal range is essential for paramedics in assessing a patient's respiratory status and determining appropriate interventions. The other ranges listed do not correspond with established physiological norms for PACO2, making them incorrect choices in this context.