types ii iii and iv gell coombs immune response reactions this has been found to be particularly useful because only five to ten percent 5 10 of individuals having immune responses to foods have the type i reaction heretofore type i responses were the only reactions which could be satisfactorily tested by means of an intradermal test as noted above these tests typically involved either injecting an aqueous solution of the food into the subcutaneous layers or pricking the skin and exposing it to the aqueous mixture of course the present invention requires no injection or prick test therefore it is even simpler than prior intradermal tests much practical information concerning the sensitivity and limitations of the dmso food mixture method was obtained by selecting patients in whom the ingestant intolerances were already known test results using the method of the present invention were compared with results from elimination diet and rast technique for seventy four 74 patients each patient was subjected to elimination diet testing rast and the dmso food mixture test method on the average for every one hundred 100 positive elimination diet reactions there were only 5 38 positive rast reactions thus the rast test was only 5 38 sensitive by contrast the dmso food mixture method was 74 41 sensitive.