Type of disease	Screening spirometry			Complete lung volume
	FVC	FEV1	FEV1/FVC	TLC	RV
Obstructive lung disease	↓ or N	↓ ↓	↓ ↓	↑ or N or ↓	↑
Restrictive lung disease	↓ or ↓ ↓	↓ or ↓ ↓	N or ↑	↓	↓