How Long Does A Peth Test To Detect Alcohol In The System?

Posted on Fri, 13 May 2016

Medically reviewed by Ask A Doctor - 24x7 Medical Review Team

Fri, 13 May 2016 Answered on

Thu, 23 Jun 2016 Last reviewed on

Question : I have been drinking 7-10 drinks once a week for 6 months twice a week on occasion how long does it take for a peth test to come back negative the last time I drank was 13 days ago I am 190 lbs and have exercised 6 times in 3 weeks I am still waiting for a response I asked this question twice I need a dr that knows this test specifically thank you

Answered by Dr. Alexander H. Sheppe (15 minutes later)

Brief Answer:
Consultation

Detailed Answer:
Hello, and thanks for your question.

The peth test detects metabolites of alcohol and reliably detects these metabolites with 99% accuracy 21 days after the last drink. After this time you will pass the test. The best way to pass the test reliably is to abstain from drinking completely, which is the purpose of blood test monitoring of alcohol.

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Above answer was peer-reviewed by : Dr. Prasad