[Neurodermatitis and food allergy. Clinical relevance of testing procedures].

In 132 children with neurodermitis, we measured specific IgG and IgE antibodies against components of cow's milk, soy milk, and egg. In addition we performed epidermal tests by rubbing the nutrients onto the intact skin. The results were compared to the effect of complete omission of milk, egg, and soy during four weeks and with the outcome of subsequent reexposition. We used standardized scales to evaluate the neurodermitis and the skin reactions and for the clinical response to the oral challenge. The best prediction for the outcome of the oral challenge was obtained by the epidermal test which had to be done with whole milk, soy milk and egg white; there was no further advantage in testing egg yolk or soy oil. IgE antibodies followed next in their predictive value. No further precision was gained by the combination of epidermal testing with IgE results, by the measurement of IgE antibodies to the constituents of cow's milk, of IgG antibodies, and of the platelet count during oral challenging. Positive reactions to oral administration after four weeks' omission of allergenic food were relatively frequent in the age group below three years, but rare in school children and adolescents.