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Glossary of Respiratory Parameters


Abbreviations
Description

AUC Flow/volume area under curve
DLCO = TLCO  Carbon Monoxide Diffusing Capacity of the lung,
DLCOC
Carbon Monoxide Diffusing Capacity of the lung, adjusted for volume
DLVA
Ratio of single breath diffusive capacity DLCO to alveolar volume
DLVC
Carbon Monoxide Diffusing Capacity of the lung, adjusted for volume and hemoglobin
ERV Expiratory reserve volume: the maximal volume of air that can be exhaled from the end-expiratory position
FEF 25 = MEF 25 Forced Expiratory Flow at 25% expired volume 
FEF 50 = MEF 50 Forced Expiratory Flow at 50% expired volume 
FEF 75 = MEF 75 Forced Expiratory Flow at 75% expired volume 
FEF0.5 Forced Expiratory Flow at 50% expired volume
FEF200-1200  Average Forced Expiratory Flow rate between 200-1200ml 
FEF2575 = MMEF Mean Mid Expiratory Flow. The average rate of flow between the 25% and 75% volume point of a FVC manuever
FEF Max The maximum instantaneous flow achieved during a FVC maneuver
FET
Forced expiratory time, the amount of tiem the patient exhales during the FVC maneuver in seconds
FEV 1/VC  Ratio between FEV1 and Vital capacity
FEV0.5 Forced Expiratory Volume in half a second
FEV1 Forced Expiratory Volume in one second
FEV1/FEV6 Ratio of FEV1 to FEV6 
FEV3 Forced Expiratory Volume in three seconds
FEV3/FVC  Ratio of Forced Expiratory Volume in three seconds to Forced Vital Capacity 
FEV6 Forced Expiratory Volume in six seconds
FIF Forced Inspiratory Flow. (Specific measurement of the forced inspiratory curve is denoted by nomenclature analogous to that for the forced expiratory curve. For example, maximum inspiratory flow is denoted FIFmax. Unless otherwise specified, volume qualifiers indicate the volume inspired from RV at the point of measurement.)
FRC  Functional Residual Capacity: The volume in the lungs at the end-expiratory position
FRC/TLC Ratio of Functional Residual Capacity to Total Lung Capacity 
FVC Forced Vital Capacity: The determination of the vital capacity from a maximally forced expiratory effort
IC Inspiratory capacity: the sum of IRV and TV
IRV Inspiratory reserve volume: the maximal volume that can be inhaled from the end-inspiratory level
IVC Inspiratory vital capacity: the maximum volume of air inhaled from the point of maximum expiration
LLN
Lower limit of Normal: The lowest value expected for a person of the same age, gender and height with normal lung function
MMET Mean Mid Expiratory Time. The elapsed time between the 25% and 75% volume point of a FVC manuever
MVV Maximal Voluntary Ventilation. Maximal voluntary ventilation: volume of air expired in a specified period during repetitive maximal effort
PEF  Peak expiratory flow: The highest forced expiratory flow measured with a peak flow meter
RV  Residual volume: the volume of air remaining in the lungs after a maximal exhalation
RV/TLC  Ratio of Residual Volume to Total Lung Capacity. Expressed as percent of TLC
TLC Total lung capacity: the volume in the lungs at maximal inflation, as per the figure below TLC = VC + RV = IC+ FRC = IRV+ TV + ERV + RV
TV = VT
Tidal volume- the volume of air that is inhaled or exhaled with each breath when a person is breathing at rest. Also referred to as VT.
VA Alveolar gas volume
VC
Vital capacity: the volume of air breathed out after the deepest inhalation.
VL Actual volume of the lung including the volume of the conducting airway.
VT = TV
Tidal volume- the volume of air that is inhaled or exhaled with each breath when a person is breathing at rest. Also referred to as TV.


Figure: Schematic of air flows versus time in the lung, indicating lung capacities

Lung Volumes


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