An arterial blood gas report indicates the patient’s pH is 7.50, PaCO2 is 30 mm Hg, and HCO3 is 23 mEq/L. How would the nurse interpret these results?

Choice A reason: Respiratory acidosis involves low pH (45 mm Hg) due to hypoventilation, causing carbon dioxide retention. The patient’s pH of 7.50 and low PaCO2 (30 mm Hg) indicate hyperventilation, not retention, ruling out acidosis and making this interpretation incorrect. Choice B reason: Metabolic alkalosis involves high pH (>7.45) and high HCO3 (>26 mEq/L) due to excess bicarbonate or base loss. The patient’s normal HCO3 (23 mEq/L) and low PaCO2 suggest a respiratory cause, not a metabolic one, as the primary imbalance is driven by hyperventilation. Choice C reason: Respiratory alkalosis is characterized by high pH (>7.45) and low PaCO2 (<35 mm Hg) due to hyperventilation, which removes excess carbon dioxide, reducing acidity. The patient’s pH of 7.50 and PaCO2 of 30 mm Hg confirm this, indicating a respiratory-driven alkalotic state. Choice D reason: Metabolic acidosis involves low pH (<7.35) and low HCO3 (<22 mEq/L) due to acid accumulation or bicarbonate loss. The patient’s high pH (7.50) and normal HCO3 (23 mEq/L) rule out metabolic acidosis, as the primary issue is respiratory, driven by low PaCO2 from hyperventilation.