What is the most appropriate initial assessment to gauge respiratory adequacy?

• A. Assess respiratory rate, effort, SpO2, and ETCO2
• B. Check blood pressure only
• C. Assess liver enzymes
• D. Assess renal function only

Answer: (A)

Assessing respiratory adequacy begins with a quick, integrated check of breathing: rate, work of breathing, oxygen saturation, and ventilation status as shown by ETCO2. The respiratory rate shows how often the person is breathing and can signal tachypnea or bradypnea. Observing the effort reveals distress or fatigue through signs like the use of accessory muscles. SpO2 indicates how well the lungs are oxygenating the blood, and end-tidal CO2 provides a real-time read on ventilation and CO2 elimination, helping detect hypoventilation or hyperventilation. Together, these measurements give a fast, direct snapshot of current respiratory function and guide immediate actions such as oxygen therapy or airway support. Measures like blood pressure alone, liver enzymes, or renal function don’t directly reflect respiratory status and aren’t useful for the initial assessment of respiratory adequacy.