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A 69-year-old woman is feeling fatigued. Blood work reveals hemoglobin of 9.0 g/dL (14 g/dL 1 year earlier). She has no other symptoms. Her blood film is shown in Figure given below. Which of the following is the most appropriate next diagnostic test?
serum B12 level
hemoglobin electrophoresis
colonoscopy
bone marrow aspiration
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