<unk>  <unk> , also called<unk> ration or blood<unk>  level, is a measurement of<unk>  intoxication used for legal or medical purposes. For example, a<unk>  of 0.10 (0.10% or one tenth of one percent) means that there is 0.10 g of<unk>  for every 100 ml of blood, which is the same as 21.7 mmol/l. A<unk>  of 0.0 is sober, while in the United States 0.08 is legally intoxicated for purposes of driving for those above 21, and above that is very impaired.<unk>  levels above 0.40 are potentially fatal.
Blood alcohol content
Blood gas tension
Blood protein
Fatty acid ratio in food
Blood sugar level
Phenolic content in tea
Oxygen saturation 
Oxygen saturation