Which of the following is a common measurement used to assess physical function?

Range of motion is a common measurement used to assess physical function because it evaluates the degree of movement around a specific joint or body part. This assessment helps physical therapists determine the functional capacity and mobility of a patient, identifying any limitations or restrictions in movement that may impact daily activities and overall quality of life. Assessing range of motion is crucial in developing an appropriate treatment plan, as it directly correlates with a person's ability to perform various physical tasks.

In contrast, pulse rate, blood pressure, and breathing rate are vital signs that provide important information regarding the cardiovascular and respiratory systems, but they do not specifically measure physical function or mobility. While these vital signs can offer insights into a patient's overall health status and response to exercise or rehabilitation, they do not directly indicate the functional capabilities of physical movement like range of motion does. Therefore, range of motion stands out among the options as a primary metric for assessing physical function.