The nurse is assessing a patient's active range of motion (ROM) and notices limited extension at the left elbow. What is the next step for the nurse to take?

A. Document muscle testing as 4/5: Manual muscle testing evaluates the strength of a muscle group against resistance or gravity. This procedure is distinct from the assessment of joint mobility and range of motion. It does not address the underlying etiology of the restricted elbow extension. B. Attempt passive ROM to bend the left arm: This action assesses flexion rather than the extension deficit noted in the clinical stem. Flexion involves decreasing the angle between the humerus and the ulna. The nurse must address the specific limitation identified during the active assessment phase. C. Recommend rest, ice, compression, elevation: This therapeutic protocol is utilized for managing acute musculoskeletal injuries and inflammation. It represents a clinical intervention rather than a diagnostic assessment step. The nurse must first complete the physical examination before determining the appropriate treatment plan. D. Attempt passive ROM to straighten the left arm: Passive range of motion helps differentiate between muscle weakness and joint or soft tissue contractures. Straightening the arm specifically evaluates the same plane of movement where the active limitation was observed. This determines the true degree of articular restriction.