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Panel reactive antibody (PRA) results for class I HLA antibodies in patients with red blood cell (RBC) antibodies (n = 30) and without RBC antibodies (n = 43). PRA ≥3% indicates the presence of HLA antibodies. PRA for class I antibodies was positive in 50% (n = 15) of patients with RBC antibodies and 21% (n = 9) of patients without RBC antibodies (P = 0.0093). High PRA >50% was more common among patients with RBC antibodies.
