Background: The American Thoracic Society (ATS) and the European Respiratory Society
(ERS) have issued several updates to their guidelines for lung function testing between …

Introduction: The ATS/ERS interpretative standardization of pulmonary function tests is in
constant update. Objective: To compare ATS/ERS recommendations for 2005 (R1) and 2021 …

The diagnosis of obstructive ventilatory impairment (OVI) is currently lacking worldwide
consensus. This lack of agreement on the threshold for a significantly low ratio of forced …

An obstructive ventilatory defect (OVD) is defined by a low forced expiratory
volume/'forced/slow'vital capacity (FEV 1/FVC)(eg< lower limit of normal (LLN)). However …

Demonstration of a reduced FEV1/VC ratio on spirometry remains the universally accepted
criterion for diagnosis of airway obstruction in routine clinical practice. Despite this, there is …

Study objectives No recommendation currently exists for grading the severity of airway
obstruction in the presence of additional restriction. The grading of airway obstruction is …

Background Current COPD guidelines advocate a fixed< 0.70 FEV1/FVC cutpoint to define
airflow obstruction. We compared rate of lung function decline in respiratory symptomatic …

Extract SP Bhatt and co-workers raise an important point with respect to how airflow
obstruction and severity of impairment are defined in the updated European Respiratory …

Rationale: Current guidelines recommend using forced expiratory volume in 1 second
(FEV1)% predicted to categorize the severity of airflow obstruction. There are limitations to …

Aim: The prevalence of airway obstruction varies widely with the definition used. Objectives:
To study differences in the prevalence of airway obstruction when applying four international …