3.1 Spirometer Readings and What they mean

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12 Terms

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Tidal Volume (TV)

The volume of air breathed in and out without conscious effort

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Inspiratory Reserve Volume (IRV)

The additional volume of air that can be inhaled with maximum effort after normal inspiration.

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Expiratory Reserve Volume (ERV)

The additional volume of air that can be forcibly exhaled after normal exhalation

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Vital Capacity (VC)

The total volume of air that can be exhaled after maximum inhalation: VC = TV + IRV + ERV.

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Residual Volume (RV)

The volume of air that remains in the lungs after maximum exhalation. Under normal conditions, the lungs are never completely emptied.

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Total Lung Capacity (TLC)

Total volume of the lungs: The sum of the vital capacity and the residual volume

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Vital Capacity formula

TV + IRV + ERV

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Total lung capacity formula

VC + RV

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Expiratory reserve volume formula

VC - (TV + IRV)

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Inspiratory reserve volume formula

VC - (TV + ERV)

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Residual volume formula

TLC - VC

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Tidal volume formula

VC - (ERV + IRV)