A<unk>  measures the maximum inspiratory and expiratory<unk> s that a patient can generate at either the mouth (MIP and MEP) or inspiratory<unk>  a patient can generate through their nose via a sniff manoeuvre (SNIP). These measurements require patient cooperation and are known as volitional tests of<unk>  muscle strength. Handheld devices displaying the measurement achieved in cmH2O and the<unk>  trace created, allow quick patient testing away from the traditional pulmonary laboratory and are useful for ward based, out patient, and preoperative assessment as well as for use by pulmonologists and physiotherapists. The principal advantage of volitional tests is that they give an estimate of inspiratory or expiratory muscle strength, are simple to perform, and are well tolerated by patients.
Respiratory pressure meter
Spirometer
Hyperoxia test
Gaseous detection device
Pulse oximetry
CO-oximeter
Arterial blood gas test
Respirometer