Atopic epicutaneous tests (APT) are a diagnostic method that has been introduced into examination armoury of patients with constitutional dermatitis in recent decenium. The method is based on principal that inhalation or food allergens are able to trigger during epicutaneous aplication positive reaction of eczema type in spite of the fact that the allergen is high molecular and protein like.
The method has been standardized. Indication to APT, the choice of individual allergens and mainly their correlation with prick tests and the level of IgE antibodies has been always a matter of discussion.