1. Improving the Differential Diagnosis of Chronic Obstructive Pulmonary Disease in Primary Care 
David B. Price, MBBChir, MA, FRCGP, Barbara P. Yawn, MD, MSPH, MSc, Rupert C.M. Jones, MBBS, MD 
Mayo Clinic Proceedings 
Volume 85, Issue 12, Pages (December 2010)
DOI: /mcp
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2. FIGURE 1
The potential for underdiagnosis and overdiagnosis of chronic obstructive pulmonary disease (COPD) with use of a fixed forced expiratory volume in the first second of expiration (FEV1) to forced vital capacity (FVC) ratio.
From Thorax,50 with permission.
Mayo Clinic Proceedings  , DOI: ( /mcp )
Copyright © 2010 Mayo Foundation for Medical Education and Research Terms and Conditions

3. FIGURE 2
An algorithm for the differential diagnosis of chronic obstructive pulmonary disease (COPD).88 FEV1 = forced expiratory volume in the first second of expiration; FVC = forced vital capacity.
Adapted from Pocket Science–COPD,99 with permission.
Mayo Clinic Proceedings  , DOI: ( /mcp )
Copyright © 2010 Mayo Foundation for Medical Education and Research Terms and Conditions