Laboratory Studies

To establish a diagnosis of pemphigus vulgaris, perform the following tests:

Histopathology from the edge of a blister
Direct immunofluorescence (DIF) on normal-appearing perilesional skin^[7]
Indirect immunofluorescence (IDIF) using the patient's serum if DIF results are positive: The preferred substrate for IDIF is monkey esophagus or salt-split normal human skin substrate.

DIF demonstrates in vivo deposits of antibodies and other immunoreactants, such as complement. DIF usually shows immunoglobulin G (IgG) deposited on the surface of the keratinocytes in and around lesions. IgG1 and IgG4 are the most common subclasses. Complement components such as C3 and immunoglobulin M are present less frequently than IgG. DIF shows intercellular deposition throughout the epidermis. This pattern of immunoreactants is not specific for pemphigus vulgaris and may be seen in pemphigus vegetans, pemphigus foliaceus, and pemphigus erythematosus. The best location for DIF testing is on normal perilesional skin. When DIF testing is performed on lesional skin, false-positive results can be observed. DIF results are shown in the image below.

Direct immunofluorescence showing intercellular immunoglobulin G throughout the epidermis of a patient with pemphigus vulgaris.

View Media Gallery

Skin biopsy specimens placed in transport media may yield false-negative results; therefore, fresh tissue is the preferred substrate for DIF studies.

In the patient's serum, IDIF demonstrates the presence of circulating IgG autoantibodies that bind to epidermis. Circulating intercellular antibodies are detected using IDIF in 80-90% of patients with pemphigus vulgaris. The titer of circulating antibody correlates with disease course.^[37]

Histologic Findings

Histopathology demonstrates an intraepidermal blister. The earliest changes consist of intercellular edema with loss of intercellular attachments in the basal layer. Suprabasal epidermal cells separate from the basal cells to form clefts and blisters. Basal cells are separated from one another and stand like a row of tombstones on the floor of the blister, but they remain attached to the basement membrane. Blister cells contain some acantholytic cells. Histopathology can help differentiate pemphigus vulgaris from pemphigus foliaceous, which demonstrates a more superficial epidermal cleavage.

Tzanck preparation is a smear taken from the base of a blister or an oral erosion that contains acantholytic cells. Blistering is preceded by eosinophilic spongiosis in some patients. The superficial dermis has a mild, superficial, mixed inflammatory infiltrate, which includes some eosinophils.

Treatment & Management

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Media Gallery

Early, small blister filled with clear fluid arises on healthy skin.
Flaccid blister filled with clear fluid arises on healthy skin.
An erosion.
Erosions and healing areas on the back.
Healing areas on the chest and abdomen.
Direct immunofluorescence showing intercellular immunoglobulin G throughout the epidermis of a patient with pemphigus vulgaris.

of 6

Author

Bassam Zeina, MD, PhD Consulting Staff, Department of Dermatology, Milton Keynes Hospital, UK

Bassam Zeina, MD, PhD is a member of the following medical societies: British Medical Association, Royal Society of Medicine, British Association of Dermatologists

Disclosure: Nothing to disclose.

Coauthor(s)

Nicole Sakka, MBBS Foundation Year 2, Royal Liverpool and Broadgreen University Hospital, Liverpool, UK

Disclosure: Nothing to disclose.

Sohail Mansoor, MBBS, MSc Dermatologist and Lead Physician in Dermatologic Surgery, Department of Dermatology, Barnet Hospital, UK

Sohail Mansoor, MBBS, MSc is a member of the following medical societies: American Academy of Dermatology, American Society for Dermatologic Surgery, Royal College of Physicians, American Academy of Anti-Aging Medicine, Royal College of Physicians and Surgeons of Glasgow

Disclosure: Nothing to disclose.

Specialty Editor Board

Richard P Vinson, MD Assistant Clinical Professor, Department of Dermatology, Texas Tech University Health Sciences Center, Paul L Foster School of Medicine; Consulting Staff, Mountain View Dermatology, PA

Richard P Vinson, MD is a member of the following medical societies: American Academy of Dermatology, Texas Medical Association, Association of Military Dermatologists, Texas Dermatological Society

Disclosure: Nothing to disclose.

Jeffrey P Callen, MD Professor of Medicine (Dermatology), Chief, Division of Dermatology, University of Louisville School of Medicine

Jeffrey P Callen, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Dermatology, American College of Physicians, American College of Rheumatology

Disclosure: Received income in an amount equal to or greater than $250 from: Biogen US (Adjudicator for study entry cutaneous lupus erythematosus); Priovant (Adjudicator for entry into a dermatomyositis study); IQVIA (Serono - adjudicator for a study of cutaneous LE) <br/>Received honoraria from UpToDate for author/editor; Received royalty from Elsevier for book author/editor; Received dividends from trust accounts, but I do not control these accounts, and have directed our managers to divest pharmaceutical stocks as is fiscally prudent from Stock holdings in various trust accounts include some pharmaceutical companies and device makers for these trust accounts for: Stocks held in various trust accounts: Allergen; Amgen; Pfizer; 3M; Johnson and Johnson; Merck; Abbott Laboratories; AbbVie; Procter and Gamble;; Celgene; Gilead; CVS; Walgreens; Bristol-Myers Squibb.

Chief Editor

Dirk M Elston, MD Professor and Chairman, Department of Dermatology and Dermatologic Surgery, Medical University of South Carolina College of Medicine

Dirk M Elston, MD is a member of the following medical societies: American Academy of Dermatology

Disclosure: Nothing to disclose.

Additional Contributors

Abby S Van Voorhees, MD Assistant Professor, Director of Psoriasis Services and Phototherapy Units, Department of Dermatology, University of Pennsylvania School of Medicine, Hospital of the University of Pennsylvania

Abby S Van Voorhees, MD is a member of the following medical societies: American Academy of Dermatology, Women's Dermatologic Society, National Psoriasis Foundation, American Medical Association, Phi Beta Kappa, Sigma Xi, The Scientific Research Honor Society

Disclosure: Received honoraria from Amgen for consulting; Received honoraria from Abbott for consulting; Partner received salary from Merck for management position; Received honoraria from Abbott for speaking and teaching; Received honoraria from Amgen for review panel membership; Received honoraria from Centocor for consulting; Received honoraria from Leo for consulting; Received none from Merck for other.

Acknowledgements

The authors and editors of Medscape Reference gratefully acknowledge the contributions of previous author, Mohsin Ali, MBBS, FRCP, MRCP, to the development and writing of this article.

Pemphigus Vulgaris Workup

Laboratory Studies

Histologic Findings

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