Final answer:
The nurse should intervene for the finding of decreased range of motion in an immobile adult.
Step-by-step explanation:
The nurse should intervene for the finding of decreased range of motion in an adult who has been immobile for the past 3 weeks. Immobility can lead to joint stiffness and muscle contractures, resulting in decreased range of motion. This can impact the patient's ability to perform activities of daily living and may require interventions such as physical therapy or exercises to improve mobility.