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Full-course drug challenge test in the diagnosis of delayed allergic reactions to penicillin.

Author(s): Borch JE, Bindslev-Jensen C

Affiliation(s): Department of Dermatology, Odense University Hospital, Odense, Denmark. science@skonvirke.dk

Publication date & source: 2011, Int Arch Allergy Immunol., 155(3):271-4. Epub 2011 Feb 3.

Publication type: Evaluation Studies

BACKGROUND: Drug challenge test (DCT) has long been the most sensitive test in the allergological work-up when investigating for penicillin allergy. OBJECTIVE: To improve sensitivity of the diagnostic work-up in diagnosing penicillin allergics with histories of allergic reactions on day 2 or later in the course of penicillin treatment. METHODS: A full-course DCT was added to the current protocol if specific IgE, skin tests and DCT were all negative in patients who had a nonimmediate reaction to penicillin treatment. Sixteen patients with a history of an immediate reaction to penicillin treatment underwent testing with negative outcomes. RESULTS: Fifty percent of patients undergoing full-course DCT experienced a cutaneous adverse drug reaction. None of the controls reacted (p = 0.001). The mean time of reaction was 6 days. Penicillin V accounted for most reactions. Urticaria was the most frequent clinical reaction observed. CONCLUSIONS: Full-course DCT offers an improvement of sensitivity and predictive values of the diagnostic work-up of allergic reactions to penicillin occurring on day 2 of penicillin treatment or later. Copyright (c) 2011 S. Karger AG, Basel.

Page last updated: 2011-12-09

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