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Alcohol Consumption Infographic

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Alcohol Consumption Infographic

Drug Testing Nail: The Benefits Over Hair


News You Can Use – In the news this week:

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Pot Plans: Efforts Surge in Congress to Reform Marijuana Laws
Read more:

Colorado Legislature Gears Up to Debate Drugged Driving Limits:

Is Pot Smoking a Stroke Trigger?


NIDA Drug Facts Week

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USDTL Supports NIDA Drug Facts Week 2013-

Follow us on Twitter as we share tweets and facts regarding drug and alcohol abuse.

Opiod and Pain Reliever Facts:
Facts on Marijuana:
Exstacy (MDMA):
Spice, Salvia and Bath Salts:


Binge Drinking Among Women in The News

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Last week the CDC released a study that concluded: “Binge drinking is reported by one in eight U.S. adult women and one in five high school girls. Women who binge drink tend to do so frequently and with high intensity. Most high school girls who reported current alcohol use also reported binge drinking.”

This growing trend in “keeping up with the boys” can have long term public health implications. 

CDC: “Implications for Public Health Practice: More widespread implementation of evidence-based interventions, such as those recommended by the Guide to Community Preventive Services and the U.S. Preventive Services Task Force, would be expected to reduce the frequency and intensity, and ultimately the prevalence of binge drinking among women and girls, and the harms related to it. “

Phosphatidylethanol (PEth)* is an alcohol biomarker (an evidence based marker) that can detect the difference between binge drinking and steady state use without worry of adulteration, bias, or incidental exposure for as far back as three weeks. The chart below shows the ability to detect drinking behaviors.

Go to to learn more about our BloodSpot™ assay, PEth and other long term alcohol biomarkers.



The Latest USDTL Research

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United States Drug Testing Laboratories, Inc. has an active research department. Our latest scientific paper is on “The Detection of 1-Palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanol and Ethyl Glucuronide in Human Umbilical Cord. ” was published in the American Journal of Analytical Chemistry, 2012, 3, 800-810 doi:10.4236/ajac.2012.312106 Published Online December 2012 ( 

Our research work on alcohol biomarkers can be read at . Look under the News category or search our research library.

Feel free to contact us at 1-800-235-2367 for more information.

For Release Immediately
December 31st, 2012

DES PLAINES, IL— HairStat® / NailStat®Improved Cutoffs — Today, United States Drug Testing Laboratories, Inc. announced that they will introduce lower substances of abuse screening and confirmation cutoffs for hair and nail specimens. 

Positive Customer Impact

Many customers have already benefited from using USDTL as a laboratory that can customize drug testing to suit their needs. The improvement of the cutoffs means that customers can now have a wider range of detection for certain substances of abuse, and can be assured that they are receiving positive drug screen confirmations not currently available at market place. The breadth and sensitivity of the profiles make these tests more effective.

HairStat® / NailStat® Availability

These improvements in HairStat and NailStat are driven by USDTL’s ongoing commitment to be a leader in alcohol and substances of abuse detection. These cutoffs will be effective for hair and nail specimens received at USDTL on or after January 2nd, 2013.

Established in 1991 as a specialty drug testing facility, United States Drug Testing Laboratories, Inc. quickly became a leader in the industry.  They have made significant breakthroughs by developing procedures to effectively use specimens to diagnose alcohol and substance misuse and abuse.  They offer a wide range of testing services and specialize in hard to detect substances of abuse and customized assays.

For more information please visit


USDTL,  HairStat®, NailStat® are trademarks of Unites States Drug Testing Laboratories, Inc. in the United States and/or other countries. 

For more information on HairStat® or NailStat®:

Hair Testing
Nail Testing

Ask the Toxicologist – What do the following results really mean?

Client Question: 


Our program has been monitoring drivers with three or more convictions for DUI using a combination of USDTL BloodSpot™ PEth and EtG in USDTL NailStat®.
One of our participants reports abstinence, but his test results suggest otherwise and can be seen in the chart below.

What do these numbers mean?

EtG Nail Level
PEth Level
Days in Program
160 pg/mg
362 ng/ml
31 pg/mg
0 ng/ml
199 pg/mg
39 ng/ml
63 pg/mg
33 ng/ml


USDTL Toxicologist Answer:

The detection time window for EtG in fingernail is approximately 3 months and the detection time window for PEth in blood spot is approximately 3 weeks.  Neither test will pick up incidental ingestion or social drinking, only binge and heavy drinking.  The baseline figures are elevated as expected from a participant that has been recently convicted of driving while impaired.  It would be expected that this individual had engaged in binge and heavy drinking over the past several weeks and months prior to entering the program.  The EtG and PEth results are consistent with this expectation.

From the time of the baseline test to the second test (11 weeks), the EtG nail levels fell from 160 pg/mg to 31 pg/mg and the PETh dropped from 362 ng/mL to negative.  The best explanation for this observation is that the donor has significantly reduced their drinking and were perhaps abstinent during this period.  The EtG detected in the nail was most likely left over from drinking prior to joining the program.

However, in 18 weeks and 24 weeks after baseline testing  the EtG in fingernail and PEth in blood spot were detected again and reflected new binge and heavy drinking after the second test and after the third test.  There were 5 weeks between the third and fourth test, if the donor had been abstinent after the third test, the PETh would have been negative.  These tests show that the donor relapsed to a steady behavior of binge and heavy drinking after the second test.