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The detection of platelet isoantibodies by the release of (3H)serotonin from platelets has been evaluated. The conditions for optimal release of (3H)serotonin with platelet isoantibodies using a microtechnique have been defined. A group of cardiac surgery patients were followed pre- and post-transfusions, with 48percent developing a positive serotonin release assay. Of these patients, 16percent also had a platelet complement-fixing and/or lymphocytotoxic isoantibody. There was variation in the degree of correlation between (3H)serotonin release and lymphocytotoxicity using individual National Institutes of Health typing serum. The matching obtained between family members by both techniques showed a close correlation when each technique was evaluated separately using the same NIH typing serum. The detection of iso-antibodies in patients with hematological malignancies correlated with the unresponsiveness to unmatched platelet transfusions in 15 out of 17 cases. The use of the patient's isoantibody to matched platelets of family members by (3H)serotonin release correlated well with the clinical response to transfusion with these platelets. The data suggest that (a) platelet isoantibodies can be detected with increased frequency by (3H)serotonin release; (b) (3H)serotonin release is a specific reaction depending on the surface antigen of the platelet; and (c) the method can be used to match compatible family members for platelet transfusions.

Detection of platelet isoantibodies by (3H)serotonin platelet release and its clinical application to the problem of platelet matching.