Interactive, cited calculators and field guides for drug and alcohol testing — built to explain detection windows, cutoffs, and uncertainty, not to predict a lab result.
Drug Test Guide publishes careful, source-backed tools for understanding drug and alcohol testing: biomarkers, detection windows, cutoff levels, and the uncertainty around any single number. Each tool is built for orientation — not for predicting a specific lab, court, workplace, medical, treatment, probation, or forensic outcome.
An interactive calculator and reference for urinary ethyl glucuronide timing: how drink count, body weight, sex, and metabolism shape the curve, and how the common 100–1000 ng/mL cutoffs read against it.
Open the EtG Field GuideAn interactive calculator and reference for urinary ethyl sulfate timing: how EtS pairs with EtG, why low cutoffs are less standardized, and how the curve reads against 50–500 ng/mL lines.
Open the EtS Field GuideAn interactive calculator and reference for nicotine exposure timing: how daily cigarette rate, use duration, quit time, and metabolism shape the cotinine curve against common 10–200 ng/mL cutoffs.
Open the Cotinine Field Guide