Ethylglucuronide, ETG, is a direct metabolite of ethanol that forms in the liver only as a result of ethanol consumption. Therefore, even after ethanol, ETOH, has been completely removed from the bloodstream (by metabolism in the liver), there should still be ETG in the bloodstream. Thus, it is possible to have a positive ETG test even if an ETOH test is negative (indicating no ETOH left in the bloodstream).
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