Which of the following can be measured directly by a ‘Spirometer'?

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Functional residual capacity

Inspiratory capacity

Total lung capacity

Residual volume

answer is A.

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Detailed Solution

Spirometer cannot be used to measure the residual volume. The total lung capacity (RV+ERV+TV+IRV) and functional residual capacity (ERV+RV) also include the residual volume. Hence, RV, TLC and FRC can be measured indirectly by a spirometer.

Inspiratory capacity (TV+IRV) can be directly measured using spirometer.

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