Blood Testing

Blood Testing for Allergies

Millions of Americans have allergies. You might sniffle and sneeze as the seasons change or get itchy and teary-eyed when you dust the house or pet an animal. Perhaps you start wheezing when you eat a particular food.

Allergy blood testing can help reveal what triggers your allergy symptoms and help your doctor choose the best treatment for you.

Types of Allergy Blood Tests

Allergy blood tests detect and measure the amount of allergen-specific antibodies in your blood. When you come into contact with an allergy trigger, known as an allergen, your body makes antibodies against it.

The antibodies tell cells in your body to release certain chemicals. These chemicals are what cause allergy symptoms. Immunoglobulin E (IgE) is an antibody that's strongly linked to the body's allergy response.

Allergy blood tests usually screen for at least 10 of the most common allergy triggers, including dust, pet dander, trees, grasses, weeds, and molds related to where you live. They are also particularly helpful in diagnosing food allergies.

Allergy blood tests may be referred to as immunoassay tests and include:

  • Enzyme-linked immunosorbent assay (ELISA, or EIA)
  • Radioallergosorbent test (RAST)

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