The isoagglutinin content of IVIGs correlates with the risk for HRs. Exclusion of high-titer donations and manufacturing steps that deplete isoagglutinins should be considered for risk mitigation. In patients with blood groups A or AB receiving doses of at least 2 g/kg, the use of IVIG batches with low isoagglutinin titers should be considered to prevent HRs.
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