How Blood Test Screen Benzodiazepines?

Benzodiazepines is a drug for anti-anxiety and sleep-inducing treatment. In United State, Benzodiazepines abuse exists. Blood test is a common way to screen Benzodiazepines overdose or abuse.

A blood test has very short detection window for Benzodiazepines. This means that after hours or days smokers don’t really have to worry about being tested positive. The window for Benzodiazepines is 6-48 hours. Even for heavy smokers, after 48 hours it’s unlikely for you to test positive.

Blood test screening also works for:

  • Amphetamines
  • Methamphetamine
  • Barbiturates
  • Cannabis
  • Cocaine
  • Codeine
  • Cotinine
  • LSD
  • PCP

Detection windows for the above drugs are all within hours to days.

  • Amphetamines: 10-14 hours
  • Methamphetamine: 24 hours
  • Barbiturates: 1-2 days
  • Cannabis: 6-24 hours
  • Cocaine: 12-24 hours
  • Codeine: 6-12 hours
  • Cotinine (metabolite of nicotine): 12-48 hours
  • LSD: 0 — 3 hours
  • PCP: 12-24 hours

The benzodiazepines are well absorbed after oral administration and are rapidly distributed throughout the body. They are extensively metabolized by the liver, and in general, slowly excreted in the urine as pharmacologically inactive conjugated metabolites. Some metabolites may possess some pharmacological activity of their own, thus displaying the “next day” effects of some benzodiazepines. Oxazepam is a common urinary metabolite of several benzodiazepines such as diazepam and temazepam.

Duration of detectability in urine is varied. Ingestion of therapeutic dosages may be detectable for 1-3 days while extended usage over a period of months or years can extend excretion times up to 4-6 weeks after cessation of use (depends on dosage & benzodiazepine)


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