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It is referred to as percent, but it is really grams per 100 milliliters (or deciliter). It is NOT corrected for the fact that 100 mL of blood is about 106 grams; it is not a true percentage by weight. This link may give you further info:
http://en.wikipedia.org/wiki/Blood_alco ... centration
For your example, 7.27 g/L would be 0.727 g/dL. It would most likely be a fatal dose. Our traffic laws about around 0.08 g/dL, but it is quoted as 0.08% BAC.