A 38-year-old woman from rural India presents with pancytopenia (Hb 7.2 g/dL, WBC 2.1 × 10⁹/L, platelets 45 × 10⁹/L). Bone marrow biopsy shows hypocellular marrow with increased fat spaces. Which of the following investigations is NOT routinely indicated in the initial workup of suspected aplastic anemia?

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