IGHE and peanut allergic reaction: For diagnosing peanut allergy, IgE antibodies against Ara h 2 and Ara h 6 are known to have a very high positive predictive value.4, 5 Recently, IgE‐binding to Ara h 7 showed a discriminative ability comparable to Ara h 2 and Ara h 6 and this 2S albumin was as potent as Ara h 2 and h 6 in inducing basophil degranulation.6 For Ara h 7, three different isoforms—Ara h 7.0101, Ara h 7.0201, Ara h 7.0301—have been described whilst Ara h 7.0101 has only be detected on cDNA but not on protein level.7 Ara h 7.0201 was the most potent isoform to induce degranulation.