Pulse Oximetry
Measures / oxygen saturation / in arterial haemoglobin.
The key property of haemoglobin / is / its ability / to combine reversibly / with oxygen.
Pulse oximeters / measure / the SaO2 / of functional haemoglobin
(some haemoglobin are dysfunctional
Eg. Carboxyhaemoglobin in CO2 exposure, burns, comatosed or cyanotic patients).