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.
Specific IgE (sIgE) Blood Testing (previously and commonly referred to as RAST or ImmunoCAP testing): This test measures levels of specific IgE directed towards foods in the blood. The range, depending upon the laboratory techniques, can go from 0.10 kU/L to 100 kU/L.