{"id":"oxygen-saturation-arterial","name":"Oxygen Saturation, Arterial (SaO2)","shortName":"SaO2","aliases":["SaO2","O2 Sat, Arterial","Oxygen Saturation, Arterial","Arterial Oxygen Saturation","Oxygen saturation (arterial)","O2 sat (ABG)","Arterial O2 saturation","Arterial oxygen saturation (SaO2)"],"abbreviations":["SaO2"],"loinc":[{"code":"2708-6","primary":true},{"code":"20564-1","primary":false},{"code":"51733-4","primary":false}],"specimen":"whole-blood","units":[{"ucum":"%","display":"%"},{"ucum":"1","display":"fraction (0–1)"}],"referenceRanges":[{"population":"Adults","low":95,"high":100,"unit":"%","unitDisplay":"%","note":"MedlinePlus lists 95–100% for arterial oxygen saturation. In healthy people breathing room air at sea level it is usually 96–98%. Alberta Precision Laboratories prints a wider 90–100% for arterial blood. Adult values only. Labs set their own limits, so use the range printed on your report.","sources":[{"title":"Arterial Blood Gas (ABG) Test","url":"https://medlineplus.gov/lab-tests/arterial-blood-gas-abg-test/","publisher":"MedlinePlus (U.S. National Library of Medicine)"},{"title":"Relating oxygen partial pressure, saturation and content: the haemoglobin-oxygen dissociation curve","url":"https://doi.org/10.1183/20734735.001415","publisher":"Breathe 2015;11:194-201","year":2015},{"title":"Laboratory Bulletin: Changes to Blood Gas Reference Intervals and Critical Values","url":"https://www.albertahealthservices.ca/assets/wf/lab/if-lab-hp-lab-bulletin-changes-to-blood-gas-reference-intervals-and-critical-values.pdf","publisher":"Alberta Precision Laboratories (Alberta Health Services)","year":2021}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"How much of the hemoglobin in your arterial blood is carrying oxygen, measured directly from a blood sample. Finger pulse oximeters estimate this same number.","url":"https://bloodtesttracker.com/markers/oxygen-saturation-arterial","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}