Which of the following vital signs must a CNA be able to measure?

The correct choice focuses on the vital signs that a Certified Nursing Assistant (CNA) is trained to measure as part of standard patient care. Temperature, pulse, respiration, and blood pressure are commonly referred to as the "vital signs." These measurements are crucial indicators of a patient's physiological status and overall health.

Temperature assesses the body's ability to maintain normal heat, which can indicate infections or other health issues when abnormal. Pulse provides information about the heart rate and rhythm, which can reveal cardiovascular problems. Respiration measures the rate and depth of breathing, which is essential in assessing respiratory health. Blood pressure gives insight into both the heart's function and the status of the circulatory system, helping to identify conditions such as hypertension or hypotension.

Other options include measurements that are valuable in healthcare but do not fall under the specific category of vital signs that a CNA is typically responsible for measuring. For instance, height and weight are important for nutritional assessments but are not classified as vital signs. Blood glucose and cholesterol levels require specific testing methods, usually performed by trained staff beyond the scope of a CNA's responsibilities. Pain level and hydration status are essential aspects of patient care but are monitored differently and may involve subjective assessments rather than standardized vital sign measurements.