An<unk>  is a method for determining if a person has a specific<unk>  allergy. It involves giving increasing amounts of a<unk>  and watching to see if an allergic reaction occurs. They are potentially dangerous.
Oral food challenge
Salicylate testing
Impedance–pH monitoring
Hydrogen breath test
GI cocktail
Fecal pH test
Sweat test
Gastric electrical stimulation