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Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial...
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Related Experiment Video

Updated: Feb 24, 2026

Basophil Activation Test for Allergy Diagnosis
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A clinical decision-making algorithm for penicillin allergy.

Angèle Soria1,2,3, Elodie Autegarden1, Emmanuelle Amsler1

  • 1a Department of Dermatology and Allergology , Tenon Hospital, APHP , Paris , France.

Annals of Medicine
|August 29, 2017
PubMed
Summary
This summary is machine-generated.

A clinical algorithm for penicillin allergy assessment showed a low misclassification rate but is not recommended for general practice. It may be useful in hospital emergency settings for quick penicillin allergy risk evaluation.

Keywords:
Clinical decisional algorithmpenicillin allergyrisk of allergy

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Area of Science:

  • Clinical Medicine
  • Allergy and Immunology
  • Pharmacology

Background:

  • Suspected penicillin allergy is common, affecting ~10% of patients, yet 85-90% are not truly allergic.
  • Accurate assessment of penicillin allergy is crucial as many patients could safely receive beta-lactam antibiotics.

Purpose of the Study:

  • To design and validate a clinical decision-making algorithm for assessing penicillin allergy risk in general practice.
  • The algorithm aimed for 100% sensitivity and negative predictive value based on patient history.

Main Methods:

  • Prospective patient inclusion and exploration based on European Network for Drug Allergy (ENDA)/European Academy of Allergy and Clinical Immunology (EAACI) guidelines.
  • Comparison of algorithm results with penicillin allergy work-up (gold standard).

Main Results:

  • True penicillin hypersensitivity was diagnosed in 15.8% of patients (41/259).
  • The algorithm demonstrated 92.7% sensitivity and 96.3% negative predictive value.
  • The algorithm misclassified 3.7% of patients with true penicillin allergy.

Conclusions:

  • The clinical algorithm, despite a low misclassification risk, is not recommended for general practice due to potential inaccuracies.
  • The algorithm may have utility in hospital emergency settings for rapid penicillin allergy risk assessment.
  • Confirmed penicillin allergy prevalence is significantly lower than suspected cases.