Which test is used to assess lung capacity?

Which test is used to assess lung capacity?

• A. spirometry
• B. pulse oximetry
• C. chest X-ray
• D. CT scan

Answer: (A)

Measuring how much air the lungs can move and how fast it can be exhaled is done with spirometry. In this test, you breathe into a mouthpiece connected to a device that records lung volumes and airflow. The key numbers, like forced vital capacity (FVC) and forced expiratory volume in one second (FEV1), reveal how much air the lungs can hold and how quickly it can be expelled, giving a clear view of overall pulmonary capacity. This makes spirometry the best tool for assessing lung capacity and function, and it’s a standard part of occupational health for baseline and periodic monitoring of workers exposed to respiratory risks. Pulse oximetry checks the oxygen level in the blood, not how much air the lungs can hold. Chest X-ray and CT scan visualize lung structure and pathology but do not provide a quantitative measure of lung capacity.

Measuring how much air the lungs can move and how fast it can be exhaled is done with spirometry. In this test, you breathe into a mouthpiece connected to a device that records lung volumes and airflow. The key numbers, like forced vital capacity (FVC) and forced expiratory volume in one second (FEV1), reveal how much air the lungs can hold and how quickly it can be expelled, giving a clear view of overall pulmonary capacity. This makes spirometry the best tool for assessing lung capacity and function, and it’s a standard part of occupational health for baseline and periodic monitoring of workers exposed to respiratory risks.

Pulse oximetry checks the oxygen level in the blood, not how much air the lungs can hold. Chest X-ray and CT scan visualize lung structure and pathology but do not provide a quantitative measure of lung capacity.