What is pulse oximetry and SpO2

 
Pulse oximetry 
Pulse oximetry is a useful method of monitoring patients in many circumstances, and in the face of limited resources, the pulse oximeter may represent a wise choice of monitor, as with training it allows for the assessment of several different patient parameters.
 
SpO2
SpO2 means, that the oxygen saturation levels are being measured repeatedly, every few milliseconds.
Each measure gives a Spot-like image of current oxygen saturation level.