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Related Concept Videos

Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

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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,...
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Allergic Reactions02:06

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Allergic Drug Reactions01:27

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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...
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Antibody Structure01:10

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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...
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Drug Toxicity: Allergic Reactions01:30

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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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Cross-reactivity00:42

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Updated: Apr 23, 2026

Basophil Activation Test for Allergy Diagnosis
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Food allergy testing.

David J Unsworth, Robert J Lock

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    |September 20, 2014
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    Summary
    This summary is machine-generated.

    Diagnosing food allergy in children requires a thorough clinical history, as laboratory tests have limitations. Clinical evaluation is paramount for accurate diagnosis and management of IgE-mediated hypersensitivity.

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    Area of Science:

    • Clinical immunology
    • Pediatric allergy

    Background:

    • Food allergy, specifically IgE-mediated hypersensitivity, affects about 15% of children in Western countries.
    • Reactions are typically immediate, occurring within minutes of food ingestion.
    • Symptoms range from mild to severe, including life-threatening anaphylaxis.

    Purpose of the Study:

    • To emphasize the critical role of detailed clinical history in diagnosing food allergy.
    • To highlight the limitations of current laboratory diagnostic tests for food allergy.

    Main Methods:

    • Review of clinical presentation and diagnostic approaches for food allergy.
    • Analysis of the utility and limitations of laboratory tests in food allergy diagnosis.

    Main Results:

    • Detailed clinical history is essential for accurate food allergy diagnosis.
    • Existing laboratory tests possess limitations, including poor positive predictive value and a restricted range of detection.

    Conclusions:

    • Clinical assessment should guide the diagnostic process for food allergy.
    • Laboratory tests serve as a supplementary tool to support, not replace, clinical judgment in diagnosing food allergy.