It is used to assess a patient’s respiratory status and to confirm treatment effectiveness. It is used to quickly identify who is hypoxic or not, and if so, what is the severity of hypoxic condition (determined by looking at non-invasive PO2, gPaO2 on the device <80mmHg for example) and severity of impairment is determined by looking at measure like oxygen deficit and source of that impairment can be determined like looking at PCO2 (PETCO2) and Oxygen Deficit. It is used to support ER triage decisions such as do I send a patient home (mild), admit (moderate) and offer intervention (severe) after hospital admission.