A nurse is assessing an adult client's vital signs. Which of the following findings indicates a potential abnormally requiring further evaluation?

Assessment of adult vital signs is essential for evaluating cardiovascular, respiratory, and overall physiologic stability. Deviations from normal ranges may indicate early disease processes such as hypertension, hypoxia, or compensatory responses to stress or illness. Blood pressure reflects arterial resistance and cardiac output, and persistent elevation may suggest vascular dysfunction or increased cardiovascular risk. Identifying abnormal trends allows for early intervention and prevention of complications such as stroke or heart disease. A. A pulse rate of 72 beats per minute falls within the normal adult resting range of 60–100 beats per minute. This indicates adequate cardiac output and autonomic balance without evidence of tachycardia or bradycardia. It does not require further evaluation in isolation. B. A blood pressure of 140/90 mm Hg is elevated and meets the threshold for stage 2 hypertension according to clinical guidelines. This suggests increased systemic vascular resistance and possible chronic cardiovascular strain. Persistent elevation increases the risk for end-organ damage, including renal disease, stroke, and heart failure, and requires further assessment and monitoring. C. An oxygen saturation of 97% on room air is within the normal range and indicates adequate oxygenation and pulmonary gas exchange. It reflects effective ventilation-perfusion matching and does not suggest respiratory compromise. No further evaluation is required based on this value alone. D. A respiratory rate of 18 breaths per minute is within the normal adult range of 12–20 breaths per minute. This suggests appropriate respiratory effort and adequate ventilation. There are no indications of respiratory distress or abnormal respiratory function from this finding.