Tricks of the trade : PaO2 vs. SpO2

Always keep SpO2 < 100% (with rare exception).

An SpO2 between 92% to 99% says something about your patient’s condition.

SpO2                           PaO2                            FiO2                                      P/F ratio

100 %                            600                              100%                                      600

100%                             500                               100%                                     500

100%                             400                                100%                                     400

100%                             300                                100%                                     300

100%                             200                                100%                                     200

100%                              100                                100%                                    100

99%                                   90                                 100%                                       90

98%                                   87                                  100%                                      87

97%                                   85                                  100%                                      85

96%                                   82                                   100%                                     82

95%                                   80                                   100%                                     80

90%                                   60                                    100%                                    60

 

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