A 58-year-old woman with a history of ovarian cancer (stage IIIC, treated with surgery and chemotherapy 2 years ago) presents for follow-up. She is asymptomatic. CA-125 level is 35 U/mL (normal <35 U/mL), and it was 8 U/mL at her last visit 3 months ago. Pelvic ultrasound and CT abdomen/pelvis are unremarkable. What is the most appropriate next step in management?

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