<prompt> Atopic dermatitis can be best diagnosed byClinical evaluationPatch testIgE levelSkin Biopsy  <response>: Atopic dermatitis best diagnosed by Clinical evaluation. The diagnosis of atopic dermatitis is rarely aided by investigations. Estimation of total serum IgE, specific radio- allergosorbent tests RASTs and prick tests usually serve only to confirm the atopic nature of the individual. Patch testing may also help to identify a contact allergen responsible for deterioration of the skin condition, paicularly in adults. 