Detecting antibodies associated
with allergens

Specific IgE (sIgE) blood testing, commonly called radioallergosorbent test (RAST) or ImmunoCAP testing, measures the amount of allergy-causing antibodies in your bloodstream, known as immunoglobulin E (IgE) antibodies. A blood sample is sent to a medical laboratory, where it can be tested for evidence of sensitivity to possible allergens. Measurement of the concentration of IgE in serum may be useful in the initial evaluation of patients suspected of having an allergic disease.