Shortened long‐term survival of incompatible red cells in a patient with anti‐McCoy‐like antibody

The long-term survival of incompatible 51Cr-labeled red cells in a patient with a high titer, low avidity antibody of anti-McCoy-like specificity was decreased (half-life = 14 days), although the 24-hour survival was normal (91.9%). This antibody was composed of IgA and IgG, the latter consisting of subclasses 1, 3, and 4.