Basic Lab ¬ Delayed Onset Allergic Reactions - Type III - IgGThese allergic reactions are difficult to diagnose because reactions do not occur until hours or days after exposure to an allergen. With delayed hypersensitivity reactions, an antibody called immunoglobulin G (IgG) is released in response to the allergen. IgG forms a complex with the allergen, which ordinarily is removed by cells dedicated to ridding the body of unwanted debris.
However, if the complex load is too heavy, the 'waste management' cells become overwhelmed and IgG-allergen complexes can be deposited in various tissues resulting in the following symptoms:
- high blood pressure
- inflamed blood vessels (usually show up as small red or purple dots on legs)
- skin conditions
- swelling around the eyes
- headaches
- asthma
- recurrent lung infections
- skin conditions
- joint pain