Questionnaire for Clinical Diagnosis of House Dust Mite's Allergy Approved by Delphi Consensus.

Despite house dust mite (HDM)-allergy is the most frequent in the world, no standard questionnaire exists to help physicians in their clinical practice for screening patients with this possible diagnosis. The objective of this survey was to develop a questionnaire that could be used to identify patients with suspicion of HDM-allergy. The survey was conducted using the Delphi methodology. Nineteen international experts in allergology constituted the scientific board who established the items included in the first version of the questionnaire, defined the criteria of the selection for the next steps, and validated the final questionnaire and its interpretation. The initial version of the questionnaire included 15 items. For each item, five answers were suggested graduated by scores from "no importance" to "very high importance." The predefined conditions for the item selection after each round were a median score ≥ 7 and > 50% of responses according "high importance" and "very high importance." The electronic survey circulated within the Interasma Scientific Network platform. Eight questions based on the occurrence/worsening of symptoms induced by HDM-allergen exposure meet the survey criteria after the second and the third rounds and were included in the final questionnaire. Binomial answers for each question with 1 point accorded for "Yes" and none for "No" were suggested for the final version with a score ≥ 5 points associated with a high probability for HDM-allergy. By applying the Delphi process, we generated a brief questionnaire with binomial answers, easy to use in clinical practice for screening patients with HDM-allergy.