Skin Scrape Test: An Inexpensive and Painless Skin Test For Recognition Of Immediate Hypersensitivity In Children And Adults



Celso Eduardo Olivier*, 1, 2, Daiana Guedes Pinto Argentão2, Raquel Acácia Pereira Goncalves dos Santos2, Mariana Dias da Silva2, Regiane Patussi Santos Lima2, Ricardo de Lima Zollner1
1 Discipline and Laboratory of Clinical Immunology, Department of Internal Medicine, Faculty of Medical Sciences, University of Campinas, São Paulo, Brazil
2 Instituto Alergoimuno de Americana -São Paulo -Brazil


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© 2013 Olivier et al;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Discipline and Laboratory of Clinical Immunology, Department of Internal Medicine, Faculty of Medical Sciences, University of Campinas, São Paulo, Brazil; Tel: 55 19 34635941; Fax: 55 19 34555726;c E-mail: celso@docsystems.med.br


Abstract

Background:

Skin testing is a mainstay in allergology, and its importance is increasing in several fields. The ability to choose the most suitable technique according to the clinical setting is an advantage for the medical team.

Objectives:

To describe in detail an alternative technique of the coetaneous allergy test (skin scrape test) conceived as a variation of the former skin scratch test; to evaluate its value as a tool for diagnosis of immune sensitization; and to compare its accuracy with the skin prick test.

Methods:

The skin scrape test and skin prick test were performed side by side with the same allergen extracts in 162 human subjects classified in two groups according to the known presence or absence of serum specific-IgE to these allergens.

Results:

The sensitivity of the skin scrape test to detect immediate reactions was 85.0%. The sensitivity of the skin prick test was 86.5%. The sensitivity of both techniques analyzed together as a unique procedure was 94.2%. The specificity of the skin scrape test was 90.1%.The specificity of the skin prick test was 72.9%.The specificity of both tests analyzed together as a unique procedure was 70.5%.

Conclusions:

The skin scrape test is an alternative and complementary technique for allergic skin testing, and it is able to detect IgE-specific immune sensitization without the disadvantages of the skin scratch test. The skin scrape test has similar outcomes to the skin prick test.

Keywords: Immediate Hypersensitivity (Medline ID D006969), Diagnosis (Medline ID D003933), Skin Test (Medline ID D012882), Dermatophagoides Antigens (Medline ID D039741), Child (Medline ID D002648), Atopic Dermatitis (Medline ID D003876), Rhinitis (Medline ID D012220), Asthma (Medline ID D001249).