Substance guides

Types of drug tests explained: Urine, blood, hair, saliva

Published April 15, 2025 · 7 min read · Updated April 2026

Reviewed for accuracy by licensed clinical professionals.

Understanding drug test types helps you know what to expect in employment, treatment, and legal settings.

Urine testing

Most common. Detects metabolites 1-30 days depending on substance. Immunoassay screen followed by confirmatory GC/MS testing. Standard panels: 5-panel (THC, cocaine, opiates, PCP, amphetamines), 10-panel (adds benzos, barbiturates, methadone, propoxyphene, methaqualone). Extended panels add specific substances.

Blood testing

Shortest detection window (hours to days). Detects active drug, not metabolites. Most accurate for determining current impairment. Used in medical and legal settings.

Hair follicle testing

Longest detection window (up to 90 days). Detects patterns of use rather than single use. Cannot determine exact timing. More difficult to adulterate. Used in pre-employment and legal settings.

Oral fluid (saliva)

Detection window of 1-3 days. Easy to collect, difficult to adulterate. Growing in popularity for workplace testing. Best for detecting recent use.

Authoritative sources

This article references guidelines from: NIDA · SAMHSA · CDC

Frequently asked questions

Which drug test is most common?

Urine testing is most common for workplace, treatment, and legal settings.

What is the longest drug test detection window?

Hair follicle testing detects use up to 90 days. Urine varies from 1-30 days depending on the substance.

Can you beat a drug test?

Adulterating or substituting samples is increasingly detectable. Confirmatory testing catches most attempts. The only reliable way to pass is abstinence.

Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.