At the primary evaluation (n = 25) allergy was concluded based on a certain case history and positive SPT in 17 patients, in 6 by a certain or possible case history and positive BaHR (negative SPT in 5/6, no SPT in 1/6) and two with a certain case history were negative in both SPT and BaHR test but were positive on oral challenge with PEG 3350. Here, AGXT is linked to allergic disease.