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The reactivity of human platelets in the 125I-labelled staphylococcal protein A test
Stored platelets have been employed in the testing of various antiplatelet antibodies and platelet unrelated immune complexes. The antisera included sera containing ABO-,HLA- or platelet specific (ZWa) antibodies and serum from an adult patient with idiopathic thrombocytopenic purpura (ITP). Use was made of 125I-labelled staphylococcal protein A (IPA) for the detection of platelet bound IgG. The reactivity of cells with the ITP serum and sera from healthy blood donors increased after storage for a few days, and declined after a highly reactive period extending over some weeks. In some cases predilution of the serum increased the probability of discovering weak antibodies. The normal components of the serum modified the platelet-antibody reaction, but all the various kinds of platelet reactive activities could be detected by this single test.
Stored platelets have been employed in the testing of various antiplatelet antibodies and platelet unrelated immune complexes. The antisera included sera containing ABO-,HLA- or platelet specific (ZWa) antibodies and serum from an adult patient with idiopathic thrombocytopenic purpura (ITP). Use was made of 125I-labelled staphylococcal protein A (IPA) for the detection of platelet bound IgG. The reactivity of cells with the ITP serum and sera from healthy blood donors increased after storage for a few days, and declined after a highly reactive period extending over some weeks. In some cases predilution of the serum increased the probability of discovering weak antibodies. The normal components of the serum modified the platelet-antibody reaction, but all the various kinds of platelet reactive activities could be detected by this single test.