PEth Resources

PEth Resources

To view the PEth Testing Panels and Collection Instructions, click here.

PEth Videos

CCDG Presentation

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Direct Alcohol Biomarkers - EtG and PEth Webinar

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Direct Biomarkers of Alcohol Use by Dr. Adam Negrusz

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Wisconsin Counties Use Long-Term Alcohol Biomarker Testing

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Long-term Biomarkers for monitoring DUI/OWI offenders

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Blood Spot Collection Training Video

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Why Test For PEth in Blood

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PEth Infographics

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USDTL PEth Test In the News

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PEth Articles

A Moment In Time 02-Feb-2015

Made In The Blood 02-Feb-2015

The Long Game 02-Feb-2015

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USDTL PEth Research

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PEth Poster Presentations

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USDTL Assisted PEth Research

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PEth White Papers

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PEth Announcements

Report Change Notification Report Change Notification


Effective July 18, 2016, USDTL will be implementing a new way of reporting quantitative results. In order to satisfy accreditation requirement, the concentrations of drugs exceeding the Upper Limit of Quantification (ULOQ) for any given drug will be reported as > ULOQ (greater than ULOQ). The ULOQ will be provided.

Quantity Not Sufficient (QNS) Explained Quantity Not Sufficient (QNS) Explained


Quantity Not Sufficient (QNS) is a result of not having a sufficient quantity (volume) of
specimen to test for the panels ordered. The amount of specimen required for collection
is directly related to the amount of specimen needed to screen and confirm for the panels we offer. The initial screening uses a portion of the original specimen and the confirmation testing uses another portion of the original specimen. To forensically confirm positives, means running a new test, with a new portion of the original specimen, using a different analytical technique.

Updated Policy Regarding Insufficient Specimen Volumes Updated Collection Instructions Updated Policy Regarding Insufficient Specimen Volumes Updated Collection Instructions


It is our first priority to deliver testing results that provide the most valuable information possible for your substance abuse testing needs. To better accomplish this duty to our clients, we are updating our policy concerning specimens that do not have sufficient volume for both preliminary testing and confirmation. Effective April 1, 2015, confirmatory tests that cannot be completed due to insufficient specimen volume will be canceled on an individual drug class and/or analyte basis. We will report confirmation results for each test for which there is sufficient volume of specimen available, giving you access to more information.

Laboratory Awarded NIAAA Funding to Investigate The Epigenetics of Prenatal Alcohol Exposure Laboratory Awarded NIAAA Funding to Investigate The Epigenetics of Prenatal Alcohol Exposure


USDTL researchers will investigate the relationship between in utero alcohol exposure and epigenetics using Small Business Innovation Research funding from the National Institute on Alcohol Abuse and Alcoholism.

Laboratory First to Obtain Specimens from the Virtual Repository of Dried Blood Spots Laboratory First to Obtain Specimens from the Virtual Repository of Dried Blood Spots


USDTL is the first laboratory to be awarded specimens from the Virtual Repository of Dried Blood Spots, a new national database of dried blood spot specimens available for use in research.

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*Click the green and white plus sign beside each question to view the answer.

How do PEth results differ from Urine EtG/EtS results?

Recent studies have indicated that low-level positive EtG results can be produced by certain agents like hand sanitizers and mouth wash (incidental exposure). Research indicates that the volume of alcohol required to trigger a positive PEth result is far above the level available from incidental exposure.

How much blood is required for a PEth testing specimen?

5 individual large drops on a dried blood spot collection card or 5 milliliters of whole blood collected in a gray-top collection tube containing anticoagulant.

What is the length of time that PEth specimens can be stored while still maintaining their integrity?

  • Room Temp = 1 year
  • Refrigerated = 1 year
  • Frozen = 1 year at 20ºC (-4ºF)

What is the window of detection for PEth?

Up to approximately 2-4 weeks depending on the starting concentration of PEth. 

Which phosphatidylethanol species do you measure during PEth testing?

Our PEth testing in dried blood spots measures the 16:0/18:1 PEth species.

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