• Stine Hangaard, Thomas Kronborg, and Ole K Hejlesen.
• Department of Health Science and Technology, Medical Informatics Group, Aalborg University, Aalborg, Denmark. svh@hst.aau.dk.
• Respir Care. 2019 Jan 1; 64 (1): 63-70.

BackgroundCOPD is largely underdiagnosed. Patients with undiagnosed COPD need to be diagnosed to ensure early treatment institution. It is therefore relevant to obtain a more profound understanding of the characteristics of patients with undiagnosed COPD to improve COPD case finding. This study aimed to explore the characteristics of subjects with undiagnosed COPD from the United States National Health and Nutrition Examination Survey (NHANES) dataset (2007-2012) based on post-bronchodilator spirometry.MethodsA multitude of statistical tests were performed to explore the potential characteristics of subjects with undiagnosed COPD. A total of 1,098 subjects with a post-bronchodilator FEV1/FVC < 0.7 or lower limit of normal (LLN) were included in the final sample.ResultsUndiagnosed subjects experienced less phlegm (P < .001), wheezing (P < .001), and chest pain (P < .001) than subjects diagnosed with COPD. They were characterized by less shortness of breath (P < .001), fewer work/school days lost to wheezing (P < .001), less sleep disturbance (P < .001), and less difficulty socializing (P < .001). The undiagnosed subjects felt less depressed (P < .001). Additionally, they were less likely to have asthma (P < .001). The annual household income was higher among the undiagnosed subjects (P < .001), and they were also characterized by higher FEV1 (P < .001), and FVC (P < .001).ConclusionsSubjects with undiagnosed COPD were characterized by fewer symptoms and had better lung function than their diagnosed counterparts.Copyright © 2019 by Daedalus Enterprises.

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