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Diagnosing of bakers' respiratory allergy: Is specific inhalation challenge test essential?

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The diagnosis of occupational asthma (OA) and/or rhinitis needs to be confirmed by means of objective methods, because it is followed by important social and financial consequences. The aim of the study was to evaluate sensitivity and specificity of diagnostic methods as skin-prick tests (SPTs) to occupational allergens, evaluation of allergen-specific serum IgE, and nonspecific bronchial hyperreactivity with reference to a specific inhalation challenge test in diagnosing bakers' respiratory allergy due to wheat flour. The study group included 358 bakers suspected of having OA due to wheat flour. They underwent physical examination, SPTs to common and occupational allergens, allergen-specific IgE determination, spirometry, nonspecific bronchial challenge, and specific inhalation test. The sensitivity of SPTs to occupational allergens in recognition of baker's rhinitis was low (47.9%) unlike the estimation of allergen-specific IgE (76.4%), with relatively high specificity (77.4 and 68.3%, respectively). Bronchial hyperreactivity (PC20 < 8 mg/mL) was the most sensitive method, whereas high degree of bronchial hyperreactivity (PC20 < 1 mg/m3) alone or bronchial hyperreactivity (PC20 < 8 mg/m3) combined with the skin reactivity to wheat flour was the most specific method of recognizing OA. Neither SPTs to occupational allergens nor evaluation of serum allergen‐specific IgE alone or combined with nonspecific bronchial hyperreactivity are characterized by sufficient diagnostic accuracy to replace the specific inhalation challenge test. For the establishment of a definite diagnosis of baker's asthma, specific challenge testing with occupational allergens should be performed.

Keywords: Asthma; bakers; diagnostic methods; occupational allergy; rhinitis; specific inhalation test; wheat flour

Document Type: Research Article

DOI: http://dx.doi.org/10.2500/aap.2011.32.3422

Affiliations: Department of Occupational Diseases and Toxicology, Nofer Institute of Occupational Medicine, 8 Teresy Street, 91-348 Lodz, Poland

Publication date: March 1, 2011

More about this publication?
  • Allergy and Asthma Proceedings is a peer reviewed publication dedicated to distributing timely scientific research regarding advancements in the knowledge and practice of allergy, asthma and immunology. Its primary readership consists of allergists and pulmonologists.

    The goal of the Proceedings is to publish articles with a predominantly clinical focus which directly impact quality of care for patients with allergic disease and asthma.

    Featured topics include asthma, rhinitis, sinusitis, food allergies, allergic skin diseases, diagnostic techniques, allergens, and treatment modalities. Published material includes peer-reviewed original research, clinical trials and review articles.

    Articles marked "F" offer free full text for personal noncommercial use only.

    The journal is indexed in Thomson Reuters Web of Science and Science Citation Index Expanded, plus the National Library of Medicine's PubMed service.
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