FRCPath Haem Part 1 MCQ- General Haematology 57

A 6yr-old boy develop dark urine following viral illness. Hb 70, reticulocytosis and reduced haptoglobin. which lab test is characteristic of this condition?

• DAT positive for IgG and C3
• DAT positive for IgG, negative for C3
• DAT positive for C3, negative for IgG
• Presence of cold agglutinins with high titre

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