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RadioAllergoSorbent Test

RadioAllergoSorbent Test

The RadioAllergoSorbent Test (RAST) may be requested when a specific allergy is in question. It gives an indication of antibodies to a specific “trigger” antigen, such as pollen or house-dust mite.

How the Test is Performed

RadioAllergoSorbent Test (RAST) is a blood test and therefore requires a blood sample from a vein.

Medical Conditions and Symptoms

Your doctor may request a RadioAllergoSorbent Test (RAST) in the event of severe allergy, asthma or hayfever, where the precipitating substance (known as an antigen) is not clear. A subgroup of antibodies called IgE antibodies are strongly associated with the abnormal immune system response in allergic reactions. Amongst these IgE antibodies, allergen-specific IgE antibody numbers can be measured by the RAST test.

Test Results Explained

RadioAllergoSorbent Test (RAST) results are given in terms of an antibody TITRE.

Related Specialists

Related Procedures

  • Blood Test (venesection)

Related Tests

Also Known As

  • Allergen-specific IgE antibody test