To view the Urine Testing Panels and Collection Instructions, click here.
USDTL Urine Research
Urine Poster Presentations
USDTL Assisted Urine Research
Foundational Urine Research
Urinary ethyl glucuronide (EtG) and ethyl sulphate (EtS) assessment: valuable tools to improve verification of abstention in alcohol-dependent patients during in-patient treatment and at follow-ups 01-Jun-2009
Urine White Papers
New data from researchers at USDTL shows that propofol use can be detected in urine samples for as long as 28 days following low-dose anesthesia.
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) 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.
We are writing to notify our clients that effective February 1, 2016, we will no longer be testing urine for antihistamines and OTC amphetamines. We apologize for any inconvenience this may cause.
I am pleased to inform you that USDTL has succeeded in improving our urine assay for antihistamine drugs by reducing the cutoff from 500 ng/mL to 100 ng/mL. The improved urine assay for antihistamine drugs will be available starting August 3, 2015.
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.
*Click the green and white plus sign beside each question to view the answer.
How do PEth results differ from Urine EtG/EtS results?
How much is needed for an adequate urine sample?
Q: Why are both ethyl sulfate (EtS) and ethyl glucuronide (EtG) included in urine testing for alcohol use, but only EtG in fingernail or hair testing?
A: For urine testing, it is standard practice in the field of toxicology to include both EtS and EtG, because EtG is subject to bacterial production and degradation if a urine sample is contaminated (e.g. when the donor has a urinary tract infection). EtS is not subject to bacterial production or degradation, and provides a second, more reliable alcohol biomarker in these urine contamination scenarios. Other specimens types, such as fingernails and hair, do not have this issue, so only EtG is measured in those sample types.
What is the detection window for urine?
Why was one matrix positive and another negative on the same donor?
Will a UTI affect the result of drug and/or alcohol testing?