11 Foods That Soothe a Sore Throat Many fruits, vegetables, and herbs are capable of saving the day with their antioxidant-rich powers and can sometimes help you avoid that trip to the doctor. iStock/Thinkstock
RAST stands for radioallergosorbent test. This is a blood test used to diagnose allergies. Your blood is drawn and a lab will analyze your blood sample for the level of antibodies that cause allergies.
Your doctor will want to do an allergy test to help determine exactly what is causing your allergy. An allergy skin test puts tiny amounts of allergens onto your skin to see which ones you react to. Or, your doctor may decide to do a blood test, such as the radioallergosorbent test (called RAST) or the ImmunoCap test.ommon allergens include mold and pollen from grasses, ragweed and trees. So, for example, if you are allergic to grass pollen, a small amount of grass pollen will be put into the shot. Allergy shots help your body fight the allergen.