A common practice for preparing red blood cell products for chronically transfused patients is to match Rh phenotype of recipient and donor by testing both for the common Rh and K antigens. What is the best rationale for this practice?

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A common practice for preparing red blood cell products for chronically transfused patients is to match Rh phenotype of recipient and donor by testing both for the common Rh and K antigens. What is the best rationale for this practice?

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