What diagnostic test for allergies involves the injection of specific allergens?What diagnostic test for allergies involves the injection of specific allergens?
a. Phadiatop
b. Skin testing
c. Radioallergosorbent tests (RAST)
d. Blood examination for total immunoglobulin E (IgE)
ANS: B
Skin testing is the most commonly used diagnostic test for allergy. A specific allergen is injected under the skin, and after a suitable time, the size of the resultant wheal is measured to determine the patient's sensitivity. Phadiatop is a screening test that uses a blood sample to assess for IgE antibodies for a group of specific allergens. RAST determines the level of specific IgE antibodies. Blood examination for total IgE would not distinguish among allergens.
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