Laboratory Studies
- Diagnosis of pemphigus herpetiformis: To establish a diagnosis of pemphigus herpetiformis, perform the following tests: histopathology on newly blistered skin, direct immunofluorescence (DIF) on periblistered skin, and indirect immunofluorescence (IIF) of the patient's sera on monkey esophagus substrate.
- Histopathology of pemphigus herpetiformis: Histopathology documents the acantholytic process and inflammatory cell infiltration (eosinophils, neutrophils, or both) that characterize pemphigus herpetiformis. Note the image below
Histopathologic examination of a blister lesion obtained from a patient with pemphigus herpetiformis shows a subcorneal blistering process, acantholysis, and neutrophilic infiltrate. - Direct immunofluorescence in pemphigus herpetiformis (see image below): DIF documents the immunologic nature of pemphigus herpetiformis. DIF usually detects the presence of IgG with or without C3 deposition around cell surfaces of keratinocytes in the patient's skin. The optimal location for the skin biopsy used in this study is adjacent to a blister or an inflammatory papule.
Direct immunofluorescence microscopy performed on a skin biopsy specimen obtained from a patient with pemphigus herpetiformis detects immunoglobulin G deposits on the epithelial cell surfaces but sparing the basal layers. - Indirect immunofluorescence in pemphigus herpetiformis: IIF confirms the presence in the patient's serum of IgG-circulating autoantibodies that bind to epidermal cell surfaces. In some patients, IgG autoantibodies predominantly bind to the upper part of the epidermis; in other patients, IgG autoantibodies bind to the entire epidermis. The titer of autoantibodies often parallels the clinical level of activity of pemphigus herpetiformis and often is helpful in following the patient's disease activity after the diagnosis has been established.
Imaging Studies
- Patients with pemphigus herpetiformis who have associated pulmonary symptoms should undergo routine chest radiography. CT scanning may also be needed.
Other Tests
- Immunoblotting in pemphigus herpetiformis[15] : Immunoblotting documents specific skin desmosomal components, in a denatured form, that are recognized by the patient's IgG autoantibodies. Most patients with pemphigus herpetiformis have IgG autoantibodies that recognize desmoglein 1, a desmosomal protein predominantly located in the upper epidermis. In a minority of patients with pemphigus herpetiformis, IgG autoantibodies were detected to desmoglein 3, a desmosomal protein predominantly located in the lower epidermis.
- Enzyme-linked immunosorbent assay in pemphigus herpetiformis[16] : Similar to immunoblotting, enzyme-linked immunosorbent assay (ELISA) detects the specific protein component (usually in recombinant nondenatured form) recognized by the patient's IgG autoantibodies. ELISA usually is more sensitive than immunoblotting in detecting the protein recognized by autoantibodies.
- Immunoprecipitation in pemphigus herpetiformis: Immunoprecipitation has the same function as immunoblotting but is more difficult to perform. Immunoprecipitation detects the native form of the target antigen rather than the denatured form of the antigen.
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