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https://www.apk-technology.com/correct-usage-method-for-spo2-probe.html


If the SpO2 probe is too tight, it may detect non-arterial pulsations, resulting in venous pulsations on the finger. Venous pulsation can also be caused by right heart failure, tricuspid regurgitation, and the hemostatic band of the blood pressure cuff above the probe. Cardiac arrhythmias can lead to inaccurate measurement results, especially in the presence of obvious defects in the apex/radial bone. The use of venous dyes in diagnosis and hemodynamic testing may result in inaccurate estimates of oxygen saturation, which are generally lower. The effects of skin pigmentation, jaundice, or elevated levels of bilirubin should also be considered.