Detection times

Detection times for benzodiazepines – saliva, urine, blood

Benzodiazepines have the widest range of detection times in the entire drug panel — short-acting ones (alprazolam, oxazepam) show up for a few days, long-acting ones (diazepam, clonazepam) can show up for weeks.

Detection window

  • Saliva test

    Detection window
    1–10 days depending on the substance

  • Urine – short-acting (alprazolam, oxazepam)

    Detection window
    1–7 days

  • Urine – long-acting (diazepam, clonazepam)

    Detection window
    Up to 30 days

  • Blood

    Detection window
    Best for quantification in medication monitoring

  • 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

  • Which specific benzodiazepine – very large variation
  • Half-life (hours for alprazolam, days for diazepam)
  • Prescription – benzodiazepines are commonly prescribed; MRO review standard
  • Liver metabolism

Related

Frequently asked questions about benzodiazepines

Diazepam and clonazepam have a long half-life and form active metabolites (nordiazepam, 7-aminoclonazepam) that are stored longer in the body. This extends the detection window considerably.

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 benzodiazepines – saliva, urine, blood