Outline the principle of co-oximetry (40% of marks), describe what a co-oximeter is able to measure (30% of marks), and compare its limitations to those of a pulse oximeter (30% of marks).

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College Answer

Most candidates confused co-oximetry with other methods of measuring oxygenation of blood. Whilst there were a number of excellent descriptions of pulse oximetry, these attracted no marks for the first two sections. Structuring the answer based on the three parts asked, would have improved answers ensuring all aspects of the question were addressed.