ASPEN	American Society for Parental and Enteral Nutrition and Metabolism
BGA	Blood gas analysis
${\mathrm{CO}}_2$	Carbon dioxide
ECMO	Extracorporeal Membrane Oxygenation
ESPEN	European Society for Clinical Nutrition and Metabolism
GFC	Galvanic fuel cell
IC	Indirect calorimetry
MEEP	Measuring Energy Expenditure in extracorporeal lung support Patients
$N_2$	Nitrogen
NDIR	Non-dispersive infrared
${\mathrm{O}}_2$	Oxygen
REE	Resting energy expenditure
RQ	Respiratory quotient
SCCM	Society of Critical Care Medicine
UN	Urinary nitrogen