The nurse is assigned four patients. Which patient should be assessed first?

Using the ABC (Airway, Breathing, Circulation) framework, the nurse must assess the patient with the most immediately life-threatening problem first. An asthma patient who cannot speak in full sentences is in severe bronchospasm with significant airway compromise — the inability to complete a sentence indicates markedly impaired breathing and imminent respiratory failure. This represents an acute emergency requiring immediate intervention. The tuberculosis patient awaiting sputum culture is clinically stable and simply awaiting a diagnostic test; there is no indication of acute distress. The COPD patient with an oxygen saturation of 90% is described as being at their personal baseline, meaning this is a chronic, compensated state and not an acute change. The pneumonia patient with a temperature of 38°C (100.4°F) has a low-grade fever that, while requiring attention, does not signal acute respiratory deterioration. In priority-setting questions on the NCLEX, acute changes that threaten the airway or oxygenation always supersede stable, chronic, or anticipated findings. The inability to speak in full sentences is a classic clinical indicator of a severe asthma exacerbation, placing this patient at the top of the assessment queue. Distractors like the COPD patient's low SpO₂ are tempting but are disqualified because the stem specifies it is the patient's baseline.