ATPD |
Ambient temperature, ambient pressure, and dry |
ATPS |
Ambient temperature and pressure saturated with water vapour |
BTPS |
Body temperature (i.e.37°C), ambient pressure, saturated with water vapour |
C |
Centigrade |
CFC |
Chlorofluorocarbons |
cm |
Centimetres |
COHb |
Carboxyhaemoglobin |
DL,CO |
Diffusing capacity for the lungs measured using carbon monoxide, also known as transfer factor |
DL,CO/VA |
Diffusing capacity for carbon monoxide per unit of alveolar volume, also known asKCO |
DM |
Membrane-diffusing capacity |
DT |
Dwell time of flow >90% of PEF |
EFL |
Expiratory flow limitation |
ERV |
Expiratory reserve volume |
EV |
Back extrapolated volume |
EVC |
Expiratory vital capacity |
FA,X |
Fraction of gas X in the alveolar gas |
FA,X,t |
Alveolar fraction of gas X at time t |
FEF25–75% |
Mean forced expiratory flow between 25% and 75% of FVC |
FEFX% |
Instantaneous forced expiratory flow when X% of the FVC has been expired |
FEV1 |
Forced expiratory volume in one second |
FEVt |
Forced expiratory volume in t seconds |
FE,X |
Fraction of expired gas X |
FIFX% |
Instantaneous forced inspiratory flow at the point where X% of the FVC has been inspired |
FI,X |
Fraction of inspired gas X |
FIVC |
Forced inspiratory vital capacity |
FRC |
Functional residual capacity |
FVC |
Forced vital capacity |
H2O |
水 |
Hb |
Haemoglobin |
Hg |
Mercury |
Hz |
Hertz; cycles per second |
IC |
Inspiratory capacity |
IRV |
Inspiratory reserve volume |
IVC |
Inspiratory vital capacity |
KCO |
Transfer coefficient of the lung (i.e.DL,CO/VA) |
kg |
Kilograms |
kPa |
Kilopascals |
L |
Litres |
L·min−1 |
Litres per minute |
L·s−1 |
Litres per second |
lb |
Pounds weight |
MEFX% |
Maximal instantaneous forced expiratory flow where X% of the FVC remains to be expired |
MFVL |
Maximum flow–volume loop |
mg |
Milligrams |
MIF |
Maximal inspiratory flow |
mL |
Millilitres |
mm |
Millimetres |
MMEF |
Maximum mid-expiratory flow |
ms |
Milliseconds |
MVV |
Maximum voluntary ventilation |
PA,O2 |
Alveolar oxygen partial pressure |
PB |
Barometric pressure |
PEF |
Peak expiratory flow |
PH2O |
水vapour partial pressure |
PI,O2 |
Inspired oxygen partial pressure |
θ (theta) |
Specific uptake of CO by the blood |
RT |
Rise time from 10% to 90% of PEF |
RV |
Residual volume |
s |
Seconds |
STPD |
Standard temperature (273 K, 0°C), pressure (101.3 kPa, 760 mmHg) and dry |
TB |
Tuberculosis |
TGV (orVTG) |
Thoracic gas volume |
tI |
Time taken for inspiration |
TLC |
Total lung capacity |
Tr |
Tracer gas |
ttot |
Total time of respiratory cycle |
TV (orVT) |
Tidal volume |
VA |
Alveolar volume |
VA,eff |
Effective alveolar volume |
VC |
Vital capacity |
Vc |
Pulmonary capillary blood volume |
VD |
Dead space volume |
VI |
Inspired volume |
VS |
Volume of the expired sample gas |
µg |
Micrograms |