Book excerpt: Revised and updated for its Seventh Edition, this highly acclaimed volume is a complete, current, and practical guide to the diagnosis and treatment of allergic disorders. This comprehensive yet concise reference will remain the first choice for residents and practitioners who need guidance to identify an allergy, confirm a diagnosis, or find effective therapies. It will also be an excellent aid for board review. This edition includes discussions of clinical trials in asthma and significant updates on drug allergy, imaging, occupational allergy, and immune deficiency evaluation. A Companion Website will include the fully searchable text and additional illustrations and tables.