In assessing Range of Motion (ROM), which of the following should a nurse evaluate?

When assessing Range of Motion (ROM), the nurse should evaluate all joints for both active and passive ROM. This process is essential to determine the functional capabilities of the joints and identify any restrictions or limitations in movement. Active ROM refers to the movements a patient can perform independently, while passive ROM involves the nurse or examiner moving the patient's joints without their assistance.

Evaluating all joints ensures a thorough assessment of the musculoskeletal system, which is critical for formulating an effective care plan and addressing any underlying issues such as pain, stiffness, or injury. This assessment can also provide insights into the patient's mobility and overall physical function, which are important for rehabilitation and recovery strategies.

The other options—monitoring heart rate and blood pressure, respiratory rate and oxygen saturation, and the patient's emotional state—while important aspects of a patient’s overall health assessment, do not directly pertain to the evaluation of Range of Motion. These measures focus more on cardiovascular, respiratory, and psychological dimensions rather than musculoskeletal function. Therefore, option A is the most relevant choice in the context of assessing Range of Motion.