Key Abbreviations and Definitions in Pulmonary Functions Tests

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Diffusing capacity of the lung; the capacity of the lungs to transfer carbon monoxide (mL/min/mm Hg)


The DLCO adjusted for hemoglobin (mL/min/mm Hg)


The DLCO adjusted for volume (mL/min/mm Hg)


The DLCO adjusted for hemoglobin and volume (mL/min/mm Hg)


Expiratory Reserve Volume; the maximum volume of air that can be exhaled from the end-respiratory tidal position (L)


Forced Expiratory Time; the amount of time the patient exhales during the FVC maneuver (seconds)


Forced Expiratory Volume in 1 second; volume of air forcibly expired from a maximum inspiratory effort in the first second (L)

FEV1/FVC ratio

Ratio of FEV1 to FVC


Functional Residual Capacity; the volume of air in lungs following a tidal volume exhalation = ERV+RV (L)


Forced vital capacity; the total volume that can be forcefully expired from a maximum inspiratory effort (L)


Inspiratory Capacity; the maximum volume of air that can be inhaled from tidal volume end-expiratory level; the sum of IRV and VT (L)


Inspiratory Reserve Volume; the maximum volumeof air that can be inhaled from the end-inspiratory tidal position (L)


Lower Limit of Normal; the lowest value expected for a person of the same age, gender, and height, with normal lung function


Peak Expiratory Flow; the highest forced expiratory flow (L/second)


Residual Volume; the volume of air that remains in the lungs after maximal exhalation (L)


Total Lung Capacity; the total volume of air in the lungs at full inhalation; the sum of all volume components (IC + FRC + or IRV + Vt + ERV + RV) (L)


Tidal Volume; the volume of air that is inhaled or exhaled with each breath when a person is breathing at rest (L)


Vital Capacity; the maximum volume of air that can be exhaled starting from maximum inspiration, TLC (L) can be measured either as Slow Vital Capacity (SVC) or Forced Vital Capacity (FVC)

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