PEth Test (for alcohol misuse)

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Product Information

This is a blood PEth test used to check for alcohol misuse in the previous 3 - 4 weeks.

peth-test-info  PEth Test (Phosphatidylethanol)

  • PEth test (Phosphatidylethanol) is the most accurate blood test to determine Alcohol Abuse for family courts, fitness to practice, clinical studies and treatment centers.
  • Phosphatidylethanol (PEth) Testing provides a detection of alcohol abuse with 99% sensitivity (far higher than traditional blood testing methods)
  • PEth testing is not affected by medications, illnesses, previous drinking habits, age or the health of the donor
  • The result provides a detection period of up to 3-4 weeks Ideally combined with Hair or Nail testing

Proof of ID:

You should bring with you a valid photo ID such as a passport or driving license. No copies or mobile images are accepted. 


Results take 5-7 working days * and will be emailed to you. They include a doctor's explanation of the results. Please note that we do not give out results by telephone as this information is confidential and there is no way of identifying a caller.

* Indicative timings only. Actual result may be earlier or slightly later.

 liver-function-blood-test  Peth testing is often combined with a liver function blood test to check for any damage to the liver from excessive alcohol consumption.


  Details Behind PEth Testing

Phosphatidylethanol testing, known as PEth testing, is a highly reliable blood test allowing the detection of chronic excessive alcohol abuse over the previous 3-4 weeks. With a sensitivity and accuracy rate of over 99% it is being widely adopted as a replacement to CDT, LFT & MCV testing which offers up to a 77% sensitivity rate.

The traditional blood testing (CDT, LFT & MCV) are known as indirect & toxic effect biomarkers. There are many factors such as hepatitis, liver disease and health issues that can result in an individual having either a false positive or false negative result even when these markers are combined.

The reason is that the testing is looking at the cells and organs to determine if they are operating in a healthy way or have been damaged. Alcohol is one of the main causes for damage to occur but someone with a cold or on certain prescription medication can also end up with a positive (out of healthy range) reading.

In contrast PEth Testing is a “direct biomarker” which means that it is only formed after someone has consumed alcohol. It also stays in the blood stream, attaching to the red blood cell membrane. When PEth is detected you can be confident that this is as a result of alcohol having been consumed.

Period of Detection

The accepted detection period for PEth testing is up to three weeks however the (greater the exposure) larger the binge session(s) the longer the period of detection. Furthermore multiple binge sessions will also increase the period of detection.

In order to generate enough detectable PEth the individual must drink in a way that raises their blood alcohol concentration (BAC) level. This is the same situation as with drink driving. Consuming small sips of alcohol does not raise the BAC levels.

Incidental Exposure

Research has indicated that a PEth test can differentiate between incidental exposure (such as hand sanitizer) and the intentional consumption of alcohol. Furthermore the level of alcohol required to be consumed to produce a positive reading is far higher than any level possible through incidental exposure.


How it works


1. Pay online by credit or debit card

2. You will be asked to enter the name(s) and date of birth(s) of the person(s) taking the test at the 'Cart' stage of the payment process. These details are essential for sample identification by the laboratory and you will be unable to proceed further without giving them. If you missed giving these details whilst making payment, please email us with this information at:

3. Initially, you will receive an automatic reply to confirm that we have received your instructions.

4. Your test request will then be processed between 9am-5pm, Monday-Friday. Once processed, you will receive a text message and email to confirm that you can now attend Patient Reception to have the test. Please wait for this confirmation before making your way to Patient Reception, otherwise they will be unaware that you will be attending.

5. You can attend Patient Reception at any time during opening hours of 7am-7pm, Monday-Friday, and 7am-1pm on Saturday. It is closed on Sundays and Public Holidays. The only exception is for Chain of Custody tests that need an appointment.

7. Make sure to bring an original photo ID such as a passport or driving license. A copy or phone image is not acceptable.

8. Results will be sent by email as soon as they are available.


Patient Reception:

The Doctors Laboratory

76 Wimpole Street

Opening hours:
Monday to Friday:7.00am - 7.00pm
Saturday: 7.00am - 1.00pm










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