What this test measures
Methamphetamine is a potent central nervous system stimulant that releases dopamine and noradrenaline in the brain. Street names include "crystal meth", "ice", and "tik". It is metabolised to amphetamine, and both parent and metabolite are detected by serum testing. Initial screens use immunoassay; positive results are confirmed by LC-MS/MS.
Legitimate medical use is rare in India — methamphetamine is on the most restricted schedule. The test is used almost entirely in toxicology, addiction medicine, workplace screening, and forensic settings.
Why it matters
Methamphetamine use is rising in pockets of India, especially in the North-East and major metros where it enters from Myanmar via the so-called "yaba" tablet trade. Acute intoxication causes agitation, hypertensive crisis, hyperthermia, tachycardia, seizures, and rhabdomyolysis. Chronic use causes paranoid psychosis, severe weight loss, and dental destruction ("meth mouth").
In the emergency room a serum methamphetamine confirms the cause of unexplained agitation, chest pain, or psychosis in a young adult. Workplace and pre-employment screening — particularly in transport, aviation, and safety-critical industries — increasingly includes methamphetamine on the panel.
How to prepare
No fasting needed. For workplace or pre-employment screening, follow the chain-of-custody process: photo ID at collection, sealed container, and tamper-evident packaging. For emergency presentations the sample is drawn on arrival and timing is recorded relative to the last suspected use. Disclose all prescribed medications — over-the-counter cold-and-flu products containing pseudoephedrine or some asthma inhalers can cause initial-screen positives that are then resolved by LC-MS confirmation.
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 |
|---|---|---|---|
| Methamphetamine (ng/mL)[1][2][3] | Not detected | Not detected on a screen rules out methamphetamine use within the previous 1–3 days for blood, longer for urine. | Any detection is abnormal in non-prescribed individuals. 50–200 ng/mL: recent use, possible intoxication. 200–1000 ng/mL: significant intoxication; sympathetic storm risk. > 1000 ng/mL: severe overdose; hypertensive emergency, hyperthermia, seizures, rhabdomyolysis. Always confirm an immunoassay-positive result by LC-MS to rule out cross-reactivity from pseudoephedrine, ephedrine, MDMA, or selegiline. |
Methamphetamine detection windows
| Specimen | Detection window after last use |
|---|---|
| Blood / serum | 1 – 3 days |
| Urine | 2 – 5 days (longer with chronic heavy use) |
| Saliva (oral fluid) | 1 – 4 days |
| Hair | Up to 90 days |
Frequently asked questions
What can give a false-positive amphetamine screen?
Pseudoephedrine and ephedrine (cold-and-flu tablets), some asthma inhalers (vicks inhaler, levmetamfetamine), the antidepressant bupropion, selegiline (Parkinson's drug), and certain MAO-A inhibitors can trigger an immunoassay positive. A confirmatory LC-MS distinguishes true methamphetamine from these.
Is methamphetamine legal in India?
No. Methamphetamine is a controlled substance under the NDPS Act. Possession, manufacture, and trafficking carry severe penalties.
How long does methamphetamine stay detectable?
In blood, 1–3 days. In urine, 2–5 days (longer in chronic users). In hair, up to 90 days. Saliva 1–4 days.
What are the signs of acute methamphetamine intoxication?
Agitation, dilated pupils, sweating, high blood pressure, tachycardia, hyperthermia, paranoia, hallucinations, chest pain, seizures. Severe cases develop rhabdomyolysis, kidney injury, stroke, and cardiac arrhythmias.
How is methamphetamine intoxication treated?
Supportive care: benzodiazepines for agitation and to control blood pressure, active cooling for hyperthermia, IV fluids for rhabdomyolysis prevention, and treatment of any acute cardiac or neurological complication. There is no specific antidote.
Why does the test report amphetamine as well?
Methamphetamine is metabolised partly to amphetamine. Reporting both is standard — it distinguishes methamphetamine use (both detected) from pure amphetamine use (only amphetamine detected). It also catches prescription drugs that metabolise to amphetamine.
Is this test used in pre-employment screening?
Yes — especially in transport, aviation, mining, and safety-critical roles. A negative result is required for hire in many large employers. Chain-of-custody collection is essential for any legally defensible result.
Related Drugs / Therapeutic Monitoring tests
Tests commonly ordered alongside METHAMPHETAMINE, or that help interpret an unexpected result.
Sources & references
- NCBI StatPearls — Methamphetamine Toxicity · accessed 2026-05-30T00:00:00.000Z
- NIH NIDA — Methamphetamine · accessed 2026-05-30T00:00:00.000Z
- CDC — Methamphetamine Overdose · accessed 2026-05-30T00:00:00.000Z
- Mayo Clinic Labs — Amphetamine/Methamphetamine, Serum · accessed 2026-05-30T00:00:00.000Z
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