A method for determining the amount of total IgE bound to leucocytes has been devised by measuring that released on incubating various cell number dilutions in acetate buffer pH 4.0. A linear relationship between IgE released and cell number was obtained over a limited concentration range. The method seemed to work satisfactorily with 50 ml of whole blood for those subjects with very high serum levels of total IgE. However, with subjects having a slightly elevated or normal serum IgE level it may be necessary to use twice the amount of blood.
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