I do not know of an allergy test that has a normal value of 0 to 5. The usual test for suspected milk allergy is called a CAPRAST and the negative score is 0.35. Anything over 0.35 is regarded as positive.Your son has never shown any obvious milk allergy.To make quite sure he needs to have the correct blood test done which is the CAPRAST for cow's milk.In the meantime there does not appear to be any reason to keep him off cow's milk.
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