Arterial blood gas with pH 7.25, PaCO2 50, HCO3- 22 indicates which prioritization?

• A. Acidemia with likely respiratory acidosis; needs airway/breathing assessment and correction; treat as high priority.
• B. Alkalemia with metabolic alkalosis.
• C. Normal acid-base status.
• D. Primary metabolic acidosis with respiratory compensation.

Answer: (A)

The main idea is recognizing acid-base status from an arterial blood gas. Here the pH is 7.25, which shows acidemia. The PaCO2 is elevated at 50 mmHg, indicating a respiratory component driving the acidemia (CO2 retention). The bicarbonate is 22, which is within the normal range and shows little to no metabolic compensation. Taken together, this pattern points to acute respiratory acidosis: the primary problem is inadequate ventilation leading to CO2 buildup, so the situation is a high-priority airway/breathing issue that needs immediate assessment and support.

Why this fits and the others don’t: the pH is acidic, so it’s not alkalemia. The bicarbonate isn’t reduced (or increased) in a way that would define a primary metabolic acidosis with compensation, and the PaCO2 is not low as would be expected with metabolic acidosis with respiratory compensation. In short, elevated CO2 with acidemia and little metabolic adjustment means respiratory failure risk and urgent breathing-related intervention.