Laboratory reference library
USDTL resources.
Original laboratory resources for hair, blood, and urine testing.
These links identify the sources used in this guide. Confirm the performing laboratory for your specific order.
Visit websiteExplore the test guides
Drugs
Hair drug testing
A longer view of drug use or exposure, using a small sample of hair cut close to the scalp.
Alcohol
PEth blood testing
An alcohol-specific blood marker that offers a view over the preceding weeks.
Alcohol
Urine EtG / EtS
A recent-use view of alcohol exposure through two metabolites measured in urine.
Drugs
Urine drug panels
A recent-use test with panel options that must match the substances requested in the order.
Alcohol
Hair EtG testing
A longer-term alcohol biomarker measured in hair, separate from a hair drug panel.
Original resources
- USDTL · Hair drug testingScalp hair, specimen collection, and the approximate three-month window.
- USDTL · PEth and dried blood spot testingBlood specimens and the variability of PEth detection.
- USDTL · Urine testingLaboratory urine testing, panel selection, and confirmation.
- USDTL · Made in the bloodAlcohol biomarkers and limitations of urine and hair testing.
- USDTL · The long gameHair EtG and the effect of cosmetic hair treatments.
- USDTL · Urinary EtG and EtS researchResearch showing substantial differences in detection times between individuals.
- USDTL · Reservoir matrices (PDF)Why specimen results cannot establish an exact dose or time of use.