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Normal arterial blood oxygen saturation levels in humans are 96–100 percent. [1] If the level is below 90 percent, it is considered low and called hypoxemia . [ 2 ] Arterial blood oxygen levels below 80 percent may compromise organ function, such as the brain and heart, and should be promptly addressed.
Keeping normal oxygen levels is a finely-tuned science. ... “And other people will come in with their oxygen saturation levels below 94, 93, 92 percent, or even lower than that. And they look ...
Dissolved oxygen levels required by various species in the Chesapeake Bay (US). In aquatic environments, oxygen saturation is a ratio of the concentration of "dissolved oxygen" (DO, O 2), to the maximum amount of oxygen that will dissolve in that water body, at the temperature and pressure which constitute stable equilibrium conditions.
A pulse oximeter probe applied to a person's finger. A pulse oximeter is a medical device that indirectly monitors the oxygen saturation of a patient's blood (as opposed to measuring oxygen saturation directly through a blood sample) and changes in blood volume in the skin, producing a photoplethysmogram that may be further processed into other measurements. [4]
As this value when given with blood gas results is often calculated by the analyzer, correlation should be checked with total CO 2 levels as directly measured (see below). SBC e: 21 to 27 mmol/L the bicarbonate concentration in the blood at a CO 2 of 5.33 kPa, full oxygen saturation and 37 Celsius. [15] Base excess: −2 to +2 mmol/L
The oxygen saturation of hemoglobin determines the content of oxygen in blood. After the human body reaches around 2,100 metres (6,900 ft) above sea level, the saturation of oxyhemoglobin begins to decrease rapidly. [2]
An arterial blood gas test (ABG) may be done, which usually includes measurements of oxygen content, hemoglobin, oxygen saturation (how much of the hemoglobin is carrying oxygen), arterial partial pressure of oxygen (P a O 2), partial pressure of carbon dioxide (P a CO 2), blood pH level, and bicarbonate (HCO 3) [92]
Blood oxygen saturation may be used for hypoxic hypoxia, but is generally meaningless in other forms of hypoxia. In hypoxic hypoxia 95–100% saturation is considered normal; 91–94% is considered mild and 86–90% moderate. Anything below 86% is considered severe. [8] Cerebral hypoxia refers to oxygen levels in brain tissue, not blood.