Definition

Noun: An immediate allergy is a type of allergic reaction where symptoms appear rapidly, typically within minutes, after a sensitized individual is exposed to an allergen.

Usage

The term is used in medical and clinical contexts to describe rapid-onset hypersensitivity reactions, distinguishing them from delayed reactions which may take hours or days to manifest.

Examples

• The patient's immediate allergy to peanuts required carrying an epinephrine auto-injector at all times.
• Skin prick tests are often used to diagnose immediate allergy to pollen or pet dander.
• Symptoms of an immediate allergy can include hives, swelling, and difficulty breathing.

Advanced Usage

• Pathophysiological Context: An immediate allergy is typically a Type I hypersensitivity reaction mediated by immunoglobulin E (IgE) antibodies.
• Clinical Management: The term is central to treatment protocols that emphasize rapid intervention, such as the use of antihistamines or epinephrine.

Variants and Related Words

• Immediate hypersensitivity: A more technical synonym often used interchangeably in immunology.
• Anaphylaxis: A severe, life-threatening form of immediate allergic reaction.
• Delayed allergy: The contrasting term for a slower allergic response (e.g., Type IV hypersensitivity).

Synonyms

• Acute allergy
• IgE-mediated allergy
• Type I hypersensitivity

Related Phrases

• Immediate allergic response: Emphasizes the reaction itself rather than the condition.
• Immediate-type allergy: An alternative phrasing with the same meaning.

Notes

This is a compound noun. The adjective "immediate" specifically modifies the type of "allergy" to indicate its rapid onset. The term is primarily used in technical writing and healthcare communication.

Noun

1. an allergic reaction that becomes apparent in a sensitized person only minutes after contact