Substance guides

Urine drug test guide: Everything you need to know

Published April 22, 2025 · 7 min read · Updated April 2026

Reviewed for accuracy by licensed clinical professionals.

Urine drug testing is the most common method used in employment, treatment, legal, and medical settings.

How it works

Initial immunoassay screen checks for drug classes. If positive, confirmatory testing (GC/MS or LC/MS/MS) identifies the specific substance and concentration. This two-step process reduces false positives.

Standard panels

5-panel: THC, cocaine, amphetamines, opiates, PCP. 10-panel adds: benzodiazepines, barbiturates, methadone, propoxyphene, methaqualone. Extended panels may add: fentanyl, tramadol, buprenorphine, gabapentin, kratom, EtG (alcohol).

False positives

Poppy seeds (morphine). Dextromethorphan (PCP). Pseudoephedrine (amphetamines). Ibuprofen (THC on some assays). Sertraline (benzodiazepines). Confirmatory testing resolves false positives.

Your rights

Right to MRO review. Right to present prescription documentation. Right to confirmatory testing. Right to retest in many circumstances.

Authoritative sources

This article references guidelines from: NIDA · SAMHSA · CDC

Frequently asked questions

What does a standard drug test test for?

5-panel tests for THC, cocaine, amphetamines, opiates, and PCP. Extended panels add additional substances.

Can medications cause a false positive?

Yes. Several OTC and prescription medications can trigger false positives on initial screens. Confirmatory testing resolves this.

How long do drugs stay in urine?

Varies widely: marijuana 3-30 days, cocaine 2-4 days, opioids 2-4 days, amphetamines 2-4 days, benzodiazepines 3-42 days depending on the specific drug.

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