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HardHaematologyImmune thrombocytopenic purpuraca-mccqe1ca-rcpsc-im

A 28-year-old woman has isolated thrombocytopenia (platelets 12 ×10⁹/L) with petechiae but no haemolysis, normal creatinine and normal blood film without schistocytes. What is the most likely diagnosis?

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