Simple radio-immunoassay for the measurement of human and rat IgE levels by ammonium sulfate precipitation.
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A simple assay for quantitating IgE levels has been developed based on the observation that antibody-bound IgE is insoluble in 33 percent saturated (NH-4)2-SO-4 whereas unbound IgE is not. The method has been applied to human and rat IgE. Some preliminary results on IgE levels in parasite-injected rats are presented.