Final answer:
When assessing for potential signs and symptoms of rejection, the nurse should prioritize assessment of the quantity of the patient's urine output.
Step-by-step explanation:
When assessing for potential signs and symptoms of rejection in a patient postoperative day 4 following a kidney transplant, the nurse should prioritize assessment of the quantity of the patient's urine output. Decreased urine output can be a sign of kidney rejection as the transplanted kidney may not be functioning properly. It is important to monitor the patient's urine output closely and report any significant changes to the healthcare team.