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Alcohol dilates peripheral blood vessels, but has been known to actually. constrict some blood vessels in the brain, lowering the oxygen content. Alcohol dilates peripheral blood vessels, but has been known to actually  constrict some blood vessels in the brain, lowering the oxygen content.
4 doctors agreed: Yes for some tests: Also it will depend on for what length of time and how much you are drinking. A blood alcohol level will show alcohol content of blood recently consumed. But a complete blood count will have indicators of changes in red blood cells as a result of chronic alcohol use.