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Four factors that can interfere w/ accurate pulse oximetry measurement:
Methemoglobinemia (falsely 
)
Carbon monoxide poisoning (falsely )
Venous congestion eg severe tricuspid regurg or cardiomyopathy (falsely )
Dark skin (falsely 
)
#MedTwitter
Methemoglobinemia (falsely ) Carbon monoxide poisoning (falsely ) Venous congestion eg severe tricuspid regurg or cardiomyopathy (falsely ) Dark skin (falsely )#MedTwitter
Correction as someone pointed out: Carbon monoxide poisoning will falsely SpO2.
Two other factors to remember:
Nail polish (falsely )
Raynaud’s (falsely )
SpO2.Two other factors to remember:
Nail polish (falsely ) Raynaud’s (falsely )
