Toxicology screen

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If the test is used as a drug screen, it must be done during a certain time period after the drug has been taken or while forms of the drug can still be detected in the body. Examples are below:

• Alcohol: 3 to 10 hours
• Amphetamines: 24 to 48 hours
• Barbiturates: up to 6 weeks
• Benzodiazepines: up to 6 weeks with high level use
• Cocaine: 2 to 4 days; up to 10 to 22 days with heavy use
• Codeine: 1 to 2 days
• Heroin: 1 to 2 days
• Hydromorphone: 1 to 2 days
• Methadone: 2 to 3 days
• Morphine: 1 to 2 days
• Phencyclidine (PCP): 1 to 8 days
• Propoxyphene: 6 to 48 hours
• Tetrahydrocannabinol (THC): 6 to 11 weeks with heavy use

Review Date: 01/12/2011
Reviewed By: Jacob L. Heller, MD, MHA, Emergency Medicine, Virginia Mason Medical Center, Seattle, Washington. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org).

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