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Racial Bias in Pulse Oximetry Measurement
Anand Swaminathan, MD and Alden Landry, MD
What is wrong with a Venous Blood Gas .?
Both ABG and VBG will give you PaO2 and saturation measurements but, we are looking for arterial oxygenation/sat; not venous. Arterial oxygenation is what we want to measure.
This NEJM article regarding pulse oximetry was discussed in detail by Josh Farkas at PulmCrit on 12/21/2020: https://emcrit.org/pulmcrit/racism-oximetry/. Turns out the difference between ABG and SpO2 is quite dependent on the specific equipment used, with Nonin having an insignificant amount difference between individuals of widely varying skin color.
What you do matters.