Table 1 Cut-off values for lung function and exercise tests

Cut-off value	Recommendation
Lung function and V′_O₂,max
FEV₁ and D_L,CO >80% pred	Resection up to pneumonectomy
V′_O2,max >75% pred or >20 mL per kg per min	Resection up to pneumonectomy
V′_O2,max <35% pred or <10 mL per min per kg	High risk of complications
V′_O2,max <35% pred or <10 mL per min per kg	A pneumonectomy or a lobectomy are usually not recommended
V′_O2,max 35–75% pred	Calculate ppo values
ppo values
ppoFEV₁ and ppoD_L,CO >30% pred and V′_O2,max >35% pred	Resection up to pneumonectomy
ppoFEV₁ or ppo V′_O2,max <30% pred	Calculate ppoV′_O2,max
ppoV′_O2,max >35% pred or >10 mL per kg per min	Resection up to pneumonectomy
ppoV′_O2,max <35% pred or <10 mL per kg per min	High risk of complications
ppoV′_O2,max <35% pred or <10 mL per kg per min	A pneumonectomy or a lobectomy are usually not recommended

Modified from the European Respiratory Society/European Society of Thoracic Surgeons guidelines [4]. V′_O₂,max: maximal oxygen uptake; FEV₁: forced expiratory volume in 1 s; D_L,CO: diffusing capacity of the lung for carbon dioxide; % pred: % predicted value; ppo: predicted post-operative value.