What is the best indicator of an obstructive lung disorder? A) FEV₁/FVC B) TLC C) FRC D) FEF_200-1200

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The FEV1/FVC ratio is the best indicator of an obstructive lung disorder as it measures the percentage of air that can be forcibly exhaled from the lungs in the first second of a forced exhalation, compared to the total amount of air that can be exhaled. If this ratio is decreased (less than 70%), it suggests an obstructive lung disorder such as asthma or COPD. TLC, FRC, and FEV1/FVC ratio are all important measures of lung function, but the FEV1/FVC ratio is the most sensitive marker of obstruction. FEV1 refers to the amount of air exhaled in the first second of forced exhalation, while FVC is the total amount of air exhaled over a full forced exhalation. TLC and FRC, on the other hand, are measures of lung capacity and do not specifically indicate the presence of an obstructive lung disorder. FEV1/FVC ratio is the most easily measured and most sensitive marker of obstructive lung disorder.

What Is the Best Indicator of an Obstructive Lung Disorder