The value of 96% seems a reasonable cut-off value.Īn SpO 2 cut-off value of ≤92% is used when screening for respiratory failure in COPD patients. SpO 2 ≤ 95% has also been identified as a risk factor for postoperative pulmonary complications. A resting SpO 2 ≤ 95% has been found to predict oxygen desaturation during sleep, exercise, and air plane travel in chronic obstructive pulmonary disease (COPD) patients. SaO 2 decreased marginally with age by about 0.20% per decade. reported a mean arterial oxygen saturation (SaO 2) of 95.5–96.9% (standard deviation (SD) 0.4–1.4). In materials for blood gas reference values, Crapo et al. There is no clear cut-off point for abnormal oxygen saturation, but SpO 2 ≤ 95% is used in most adult studies. Low oxygen saturation or hypoxemia is associated with conditions or diseases involving ventilation–perfusion mismatch in the lungs, hypoventilation, right-to-left shunts, reduced diffusion capacity, and reduced oxygen partial pressure in inspired air. Pulse oximetry is used extensively in clinical medicine to evaluate and monitor patients. Pulse oximeters are cheap and are used widely as non-invasive devices for estimating oxygen saturation (SpO 2).
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