The main blood test for allergies measures the level of immunoglobulin E (IgE) in your blood. IgE is an antibody produced by your body's immune system. Higher-than-normal levels of IgE can indicate an allergic reaction.
Understanding the IgE Blood Test
This test, often called a specific IgE test or an allergy blood test, detects the presence of IgE antibodies specific to certain allergens. Your doctor will likely order this test if you are experiencing symptoms suggestive of allergies, such as sneezing, itching, rash, or difficulty breathing.
How the Test Works
The test involves a simple blood draw. The sample is then analyzed in a lab to determine the amount of IgE present, and potentially, which specific allergens are triggering the response (e.g., pollen, pet dander, peanuts). This helps your doctor identify the specific allergens you’re sensitive to.
Interpreting the Results
The results will indicate the level of IgE in your blood. High levels might signify an allergic reaction. However, it's crucial to understand that a high IgE level doesn't definitively diagnose an allergy. Your doctor will consider this result along with your medical history and symptoms to make a diagnosis.
- Positive Result: Indicates the presence of IgE antibodies against a specific allergen.
- Negative Result: Indicates that IgE antibodies to the tested allergens are not present at detectable levels.
The blood test for allergies is a valuable tool for diagnosing allergies, but it's essential to discuss the results with your doctor for a complete and accurate interpretation. They will use the results alongside your symptoms to determine the best course of action.
