It means 66% of the hemoglobin molecules are oxygenated. This is a very low reading for arterial blood -- not compatible with life (for a human) for more than a few minutes -- though it might be seen in venous blood. Normal arterial oxygen saturation percentage is in the 90s.
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example: say saturation level of sugar in water is 70 percent, if the solution is 70 percent sugar, it is saturated
it means that 70% of what is in the air is oxegon
800%
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