Abbreviations

Description


AUC 
Flow/volume
area under curve 
DLCO = TLCO 
Carbon
Monoxide Diffusing Capacity of the lung,

DLCO_{C}

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
endexpiratory 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 
FEF2001200 
Average
Forced Expiratory Flow rate between 2001200ml 
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 FIF_{max}. 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 endexpiratory
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
endinspiratory 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. 