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Algorithm 1: Investigation pathway for a patient with a raised carcinoembryonic antigen (CEA) with a previous history of a CEA-expressing cancer. aOrgan-specific investigations: tumor markers, CT scan, colonoscopy, gastroscopy, mammography, cystoscopy, Ultrasound Scan (US), bone scan, biopsy, other test as required. PET/CT, positron emission tomography-computed tomography.
