Pulse oximetry. Gold standard or false sense of security?
OBJECTIVE
To provide a concise review of the history, technology, theory, limitations and outcomes of pulse oximetry.


METHODS
Articles published in major medical journals since 1985 critically appraising pulse oximetry were reviewed, as were numerous historical papers.


RESULTS
The pulse oximeter is an imperfect device, with numerous potential limitations.


CONCLUSIONS
The pulse oximeter is reasonably accurate under most conditions. However, its reliability diminishes as the clinical situation deviates from the norm, possibly when accuracy is most needed.
Grace
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Department of Anaesthetics, Royal North Shore Hospital, St Leonards, NSW.
D006801:Humans; D010092:Oximetry