Accuracy of Vitalograph lung monitor as a screening test for COPD in primary care

This was a prospective case–control study designed to evaluate the screening performance of the Vitalograph Lung Monitor for identifying COPD in 544 primary care patients enrolled in the Birmingham COPD Cohort Study. The primary aim was to assess the pre-bronchodilator test accuracy of the Lung Monitor (FEV1/FEV6 ratio) against post-bronchodilator confirmatory spirometry (FEV1/FVC ratio), using the LLN definition of airflow obstruction.