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IgE or immunoglobulin E is an antibody involved in the classic allergic reactions (type I reactions). It can be measured in a blood analysis.

Everybody has IgE; the levels are raised until the age of 18 years, and then remain stable. Levels that are normal for adults or older children can be very high for infants or younger children.

What does IgE level indicate?

If someone is allergic to something that they are constantly around, such as mold in a house or cat dander, then the total IgE level may be persistently increased. An elevated level of total IgE indicates an allergic process is likely present, but it will not indicate what a person is allergic to

What is the normal range of IgE?

Variations in the upper limit of normal total serum IgE have been reported: they can range from 150 to 1,000 UI/ml; but the usually accepted upper limit is between 150 and 300 UI/ml.

What does the IgE number mean?

The total IgE test may be used to help screen for and detect allergic diseases. It measures the overall quantity of immunoglobulin E in the blood.Immunoglobulin E (IgE) is an antibody that is produced by the body’s immune system in response to a perceived threat.

How is IgE testing done?

Explaining IgE.This test measures the blood level of IgE, one of the five subclasses of antibodies. Antibodies are proteins made by the immune system that attack antigens, such as bacteria, viruses, and allergens. IgE antibodies are found in the lungs, skin, and mucous membranes.

Can a blood test detect allergies?

Blood tests measure the presence of IgE antibodies to specific foods. (IgE, short for “immunoglobulin E,” is the antibody that triggers food allergy symptoms.) In the past, these tests were called “RASTs” (which stands for radioallergosorbent tests) because they used radioactivity, but modern tests do not