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That hasn't been clearly defined. Some estimate that PEth (phosphatidylethanol) becomes positive around 84 g (approx 6 drinks) of consumption, others claim closer to 200 g (approx 14 drinks). Both measured by pure alcohol at 14 g per drink.

Suffice to say that PEth becomes positive only after drinking on 6 or more sequential days, little as one drink per day, or by binge drinking on a single day.

Although the test is already in use by a couple of laboratories there is much more that needs to be clarified.

Since it requires a blood draw it is unlikely that the test will replace EtG/EtS testing.

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Q: How many drinks does a peth blood alcohol test detect?
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