The<unk> <unk>  is a medical<unk>  used mainly in pulmonology that involves measuring the concentrations of various infused,<unk> <unk> es in mixed venous blood, arterial blood, and expired<unk>  of a subject. The<unk>  quantifies true shunt, physiological dead space ventilation, ventilation versus blood flow () ratios, and diffusion limitation.
Multiple inert gas elimination technique
Carbon monoxide detector
Gaseous detection device
Lung float test
Post bronchodilator test
Structured light plethysmography
Hyperoxia test
Whole-body counting