Pulse oximetry in primary care

Pulse oximetry is a method of assessing arterial oxygen saturation. Chronic obstructive pulmonary disease (COPD) patients may have a chronically low SaO₂, and values of 80–90% are often observed. The National Institute for Health and Clinical Excellence guidelines on management of COPD emphasise the value of measuring oxygen saturation. COPD patients may have a chronically low SaO₂, and values of 80–90% are often observed. It is important that a 'well' value is documented so that any further decline can be recognised. The cost of an oximeter ranges from £250 to £800. Patients with severe COPD should have their SaO₂ measured so that hypoxaemia can be detected, in which case they are then considered for long-term oxygen therapy. The British Thoracic Society guidelines on managing patients with respiratory problems who are planning to travel by air state that patients with a resting SaO₂ of < 92% in room air should receive in-flight oxygen. Oximetry aids the decision-making process with regard to hospital admission.