What is IgE?
Total IgE test, also known as quantitative IgE test, measures the quantity of immunoglobulin E (IgE) in the blood. When you have an allergy, your immune system regards a foreign substance, such as dust or pollen, as a threat. Your immune system fights against this threat by producing antibodies called IgE.
While total IgE test measures the overall number of IgE antibodies in your blood, another type of test called a specific IgE test tells you the quantity of IgE antibodies in response to a particular allergen.