Clinically relevant tests

Measurement

Test

Common clinical use

PaO2, SaO2, PaCO2

Arterial blood gases

SpO2

Pulse oximetry

End-tidal PCO2

Capnography

Vital capacity, tidal volume

Spirometry, electronic flowmetry

Serial measurement of borderline function (VC <10-15ml/kg) e.g. Guillain-Barré syndrome

Peak expiratory flow rate FEV1, FVC

Wright peak flow meter Spirometry, electronic flowmetry

(Spontaneous ventilation) asthma (Spontaneous ventilation) asthma, obstructive/restrictive disease

Lung/chest wall compliance (see equations opposite)

Pressure-volume curve

Ventilator adjustments, monitoring disease progression

Flow-volume loop, pressure-volume loop

Pneumotachograph manometry

Ventilator adjustments

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