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Introduction and aim: The aim of our research is to evaluate and compare commonly performed diagnostic tests, and to examine the psychological disorders induced by this food allergy. Children with symptoms suggesting cow's milk protein allergy were included in this study (n = 47). Blood and saliva samples were collected from the participants. Parents were asked to fill in a questionnaire constructed by the research team (containing the DSM-5 symptoms checklist about attention deficit hyperactivity disorder). Method: One of the most widely used diagnostic tool is the skin allergy test, which was performed in 47 subjects (n = 47, mean age: 7.36 years); only 2 children showed positive test result for cow's milk. Lymphocyte transformation test was observed to be positive in 8 children (17%), 4 subjects demonstrated questionable results. In our sub-study about psychological symptoms (n = 43, mean age: 7.88 years), the score was according to the attention deficit hyperactivity disorder symptom checklist before the diet (6.88, SD: 4.43) and showed significant decrease after 3 months of the elimination diet (4.48, SD: 3.69, p = 0.001). Scores of children with sleep disorder (10.62, SD: 4.23) also represented a significant reduction after 3 months of the diet (6.69, SD: 4.59, p = 0.009). Salivary cortisol levels did not show significant changes before and after elimination diet. Results: According to our data, skin allergy testing and lymphocyte transformation test are not reliable diagnostic tools for establishing the diagnosis. Conclusion: We conclude that a significant improvement in clinical symptoms can only be achieved with a strict elimination diet. Orv Hetil. 2019; 160(33): 1311-1318.