Thanks for your question.
CDT levels would not rise to levels mandated as positive with one episode of drinking 10-20ml.
CDT tests is typically used to test increased alcohol intake over several days.
You should be fine with this test with only one episode of drinking.
Do you have any question regarding this issue?
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Yes, it does mean that 240ml or 192 grams of alcohol but still this much amount may not be enough to cause cdt levels to be positive.