A 38-year-old woman presents with progressive fatigue, recurrent infections, and spontaneous bruising for 3 weeks. Full blood count reveals hemoglobin 8.2 g/dL, WBC 2.1 × 10⁹/L, and platelets 45 × 10⁹/L. Reticulocyte count is 0.8%. Which investigation is most appropriate to establish the diagnosis of aplastic anemia?

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