The accurate diagnosis of autoimmune bullous diseases of the skin requires evaluation of clinical, histologic, and immunopathologic findings. There is generally a risk of serious side effects or complications in the treatment of autoimmune bullous diseases especially of pemphigus. Therefore definite diagnosis is essential for accurate and effective treatment. Fortunately, there are invaluable laboratory methods such as immunofluorescence tests in confirming a diagnosis that is suspected by clinical examination. In this article, the application techniques of these tests briefly and particularly the immunofluorescence findings that could be obtained in autoimmune bullous diseases were discussed. (Turkderm 2011; 45 Suppl 1: 31-5)