Final answer:
An appropriate intervention for a patient with deficient fluid volume related to fluid restriction and osmotic diuretic use is to monitor serum electrolytes.
Step-by-step explanation:
An appropriate intervention for the diagnosis of deficient fluid volume in a postoperative patient who is under fluid restriction and using osmotic diuretics would be to monitor serum electrolytes.
When a patient is experiencing deficient fluid volume, it is important to monitor their electrolyte levels because imbalances in electrolytes can occur due to the loss of fluids. By regularly checking the levels, the nurse can identify any abnormalities and take appropriate actions to correct them.
Other interventions, such as changing the patient's position, maintaining NPO status, and monitoring arterial blood gas (ABG) values, may also be important aspects of the plan of care for this patient, but monitoring serum electrolytes specifically addresses the issue of deficient fluid volume.