Detection times

Detection times for amphetamine – saliva, urine, blood, hair

Amphetamine and methamphetamine have a short half-life and a relatively narrow detection window compared with cannabis. Here are the detection times and the most common cross-reactions with medicines.

Detection window

  • Saliva test

    Detection window
    5–48 hours

  • Urine – rapid test

    Detection window
    1–3 days

  • Urine – lab-verified

    Detection window
    2–4 days

  • Blood

    Detection window
    12 hours – 2 days

  • Hair

    Detection window
    Up to 90 days (3 cm hair segment)

Times are approximate and vary with dose, frequency, individual metabolism and cut-off value.

Factors that affect detection time

  • Urine pH – acidic urine gives faster excretion, alkaline urine can prolong detection
  • Dose and frequency
  • Metabolism and liver function
  • Prescription medicines (Concerta, Strattera) often give a positive result — MRO review required

Related

Frequently asked questions about amphetamine and methamphetamine

Yes, lisdexamfetamine (Vyvanse), dexamfetamine (Attentin) and methylphenidate (Concerta) can give positive results. MRO physicians review and approve them with a prescription as a medical explanation.

Dig deeper by substance

Substance-specific detection times

Detailed detection windows, contributing factors, and frequently asked questions per substance.

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Detection times for amphetamine – saliva, urine, blood, hair