text: The diagnosis of COPD is confirmed by spirometry, a test that measures the forced expiratory volume in one second (FEV1), which is the greatest volume of air that can be breathed out in the first second of a large breath. Spirometry also measures the forced vital capacity (FVC), which is the greatest volume of air that can be breathed out in a whole large breath. Normally, at least 70% of the FVC comes out in the first second (i.e. the FEV1/FVC ratio is >70%). A ratio less than normal defines the patient as having COPD.
option_0: Chronic obstructive pulmonary disease study of choice
option_1: Chronic stable angina test selection guideline for the individual basis
option_2: Pulmonary embolism assessment of clinical probability and risk scores
option_3: D-dimer prognostic role in mortality
option_4: Central sleep apnea here screening
option_5: Aortic insufficiency classification of severity
option_6: Chronic obstructive pulmonary disease electrocardiogram
option_7: Chronic stable angina definition