Causes of Falsely Low Oxygen Saturation - Discordant SpO2 & PaO2 • Motion • Low perfusion state • Skin pigmentation • Nail polish • Methemoglobin • Sulfhemoglobin • Hgb <5 • Hemoglobinopathies • Venous congestion - BWH Medicine Chiefs @BrighamChiefs #Falsely #Low #Oxygen #Saturation #Discordant #SpO2 #PaO2 #diagnosis #differential