Pulse oximeter is a simple, relatively cheap and non-invasive technique to monitor oxygenation. It monitors the percentage of haemoglobin that is oxygen-saturated.
Oxygen saturation should always be above 95%, although in those with long-standing respiratory disease or cyanotic congenital heart disease, it may be lower, corresponding to disease severity.
The oxyhaemoglobin dissociation curve becomes sharply steep below about 90%, reflecting the more rapid desaturation that occurs with diminishing oxygen partial pressure (PaO2).
On most machines the default low oxygen saturation alarm setting is 90%.
Pulse oximeters are used to detect the SPO2 level in the blood of pateint and often used with oxygen concentrators and cylinders.
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