What this test measures
Urine immunoassay for amphetamine class compounds (amphetamine, methamphetamine, MDMA, MDA). Standard SAMHSA cutoff is 500 ng/mL (initial screen) and 250 ng/mL (confirmation). Confirmation uses GC-MS or LC-MS/MS to distinguish parent amphetamine, methamphetamine, MDMA, and prescription stimulants (Adderall, Ritalin, Vyvanse).
Why it matters
Indian use scenarios: pre-employment / workplace drug testing (IT, transport, hazardous industries), corporate wellness, police / forensic testing, deaddiction programmes, athletic drug control (NADA, WADA), and clinical evaluation of suspected stimulant intoxication. Methamphetamine (crystal meth, "ice") use is rising in some northern Indian regions. Cross-reactivity is a real issue — pseudoephedrine (decongestants), bupropion, selegiline, and some over-the-counter products can produce false-positive screens; confirmation by GC-MS is essential before any action is taken.
How to prepare
Random urine sample. Standard chain-of-custody collection if for legal / employment purposes. Disclose all prescription and over-the-counter medications, especially decongestants (pseudoephedrine, phenylephrine), ADHD medications (methylphenidate, amphetamine salts, lisdexamfetamine), antidepressants (bupropion, selegiline), and nasal sprays.
Markers & reference ranges
Reference ranges below are typical adult values. Your lab's reported range may differ slightly based on the assay platform and patient demographics — always read your report against the range printed on it.
| Marker | Normal range | If low | If high |
|---|---|---|---|
| Urine Amphetamine (ng/mL)[1][2] | Negative (< 500 ng/mL screen cutoff) | Negative — no recent amphetamine-class drug use, OR exposure outside detection window (typically 2–4 days after last use; longer with chronic heavy use). | Positive (≥ 500 ng/mL screen) — sends for confirmation by GC-MS to identify specific compound. Possible interpretations: licit prescription (ADHD medication, lisdexamfetamine, selegiline), over-the-counter (pseudoephedrine — rare false positives), illicit (methamphetamine, MDMA), or rare false positive from atypical cross-reactants. Document timeline and clinical context before action. |
Amphetamine detection windows in urine
| Substance | Detection window | Notes |
|---|---|---|
| Amphetamine (single use) | 1–3 days | Heavy chronic: up to 7 days |
| Methamphetamine | 2–4 days | Cleared as amphetamine + methamphetamine |
| MDMA (ecstasy) | 2–4 days | May test positive for amphetamine class |
| Adderall / Ritalin (prescribed) | 1–3 days | Disclose to interpreting clinician |
| Pseudoephedrine (decongestant) | May trigger screen | GC-MS distinguishes |
Frequently asked questions
Will my ADHD medication cause a positive result?
Yes — prescription amphetamine salts (Adderall, Vyvanse) and methylphenidate (Ritalin) produce positive amphetamine screens. Disclose your prescription so the result can be interpreted appropriately.
Can a cold medicine cause a positive?
Pseudoephedrine and phenylephrine occasionally cross-react on screening immunoassays, producing false-positive amphetamine screens. GC-MS confirmation distinguishes them definitively.
How long does methamphetamine stay detectable?
2–4 days in urine for occasional use; up to a week with chronic heavy use. Hair testing detects use up to 90 days back.
Is the test legal to refuse?
Depends on context: pre-employment / workplace testing requires consent in India; mandatory testing exists in some safety-critical industries (transport, aviation). Forensic / legal testing follows different rules.
What does "presumptive positive" mean?
Immunoassay screening result is positive but not confirmed. GC-MS / LC-MS must follow before any employment or legal action.
Can second-hand exposure cause a positive?
No. Passive inhalation or environmental contamination does not produce positive urine amphetamine results.
Related Drugs / Therapeutic Monitoring tests
Tests commonly ordered alongside AMPHETAMINE, or that help interpret an unexpected result.
Sources & references
- SAMHSA — Urine Drug Testing Guidelines · accessed 2026-05-30T00:00:00.000Z
- NIH MedlinePlus — Drug Testing · accessed 2026-05-30T00:00:00.000Z
- WHO — Substance Use Screening · accessed 2026-05-30T00:00:00.000Z
- DSM-5 — Stimulant Use Disorder · accessed 2026-05-30T00:00:00.000Z
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