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Anti‐JMH identified in serum and in eluate from red cells of a JMH‐negative man

Anti‐JMH was identified in the serum of an 80‐year‐old JMH‐negative man. Before transfusion, his direct antiglobulin test was weakly positive with polyspecific reagents, anti‐C3 and anti‐lgG. An eluate prepared from his red cells contained anti‐JMH. Chromium‐51‐labeled JMH‐positive cells which were weakly incompatible in vitro appeared to survive normally. Following transfusion with three JMH‐positive units, the patient's hematocrit increased from 20.7 percent to 32.1 percent.