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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

Overview
Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin, heparin),...
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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 exposure to a...
Antibody Structure01:10

Antibody Structure

Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Allergic Drug Reactions01:27

Allergic Drug Reactions

Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing numerous...
Hypersensitivities01:30

Hypersensitivities

Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...

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Related Experiment Video

Updated: May 27, 2026

Basophil Activation Test for Allergy Diagnosis
07:22

Basophil Activation Test for Allergy Diagnosis

Published on: May 31, 2021

Appropriate allergy testing and interpretation.

Jay M Portnoy1

  • 1University of Missouri-Kansas City School of Medicine, USA. jportnoy@cmh.edu

Missouri Medicine
|November 12, 2011
PubMed
Summary
This summary is machine-generated.

In vitro allergy testing detects specific IgE antibodies. However, the presence of IgE without symptoms does not confirm a clinical allergy, and broad allergen panels risk misinterpretation.

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Area of Science:

  • Clinical immunology
  • Diagnostic allergy testing

Background:

  • In vitro tests for specific immunoglobulin E (IgE) are utilized in allergy diagnosis.
  • These tests aid primary care providers in evaluating patients with suspected allergies.

Purpose of the Study:

  • To clarify the diagnostic utility of in vitro allergy testing.
  • To highlight potential pitfalls in interpreting allergy test results.

Main Methods:

  • Review of diagnostic principles for allergy testing.
  • Analysis of the role of specific IgE in relation to clinical symptoms.

Main Results:

  • Specific IgE testing identifies antibodies associated with allergic reactions.
  • The presence of specific IgE alone, without correlating symptoms, does not confirm a clinical allergy.
  • Extensive allergen panel testing can increase the likelihood of false-positive results.

Conclusions:

  • In vitro allergy testing is a valuable tool when interpreted alongside clinical presentation.
  • Careful selection of allergens and correlation with symptoms are crucial to avoid misdiagnosis, especially in food allergies.