Which clinical tool helps identify the degree of hypoxemia in patients?

The pulse oximeter is the clinical tool that best helps identify the degree of hypoxemia in patients. It is designed to non-invasively measure the oxygen saturation of hemoglobin in the blood. By using light-emitting diodes to capture the percentage of oxygenated hemoglobin compared to total hemoglobin, the pulse oximeter provides real-time data that is crucial for assessing a patient’s respiratory status and oxygenation levels.

In contrast, a sphygmomanometer is used to measure blood pressure, which does not directly indicate oxygen levels. A stethoscope allows for the auscultation of heart and lung sounds but does not provide direct measurements of oxygen saturation. A thermometer is used to measure body temperature, which does not relate to the assessment of hypoxemia. Therefore, among the provided options, the pulse oximeter is the most relevant and effective tool for evaluating how well oxygen is being transported throughout the body.