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Toxicology Screen


Results and Values

What do the test results mean?

Normal values for toxicology screens depend on the institution performing the tests. In general, the following values apply:

  • There should be no illegal drugs in the blood or urine.
  • There are acceptable levels for over-the-counter medications. These are called therapeutic levels.
  • There should be no alcohol.
  • Cigarette smoking may affect some test results.
  • The presence of nonprescription drugs may show unapproved drug use.
  • Specific tests can show the drug used.
  • High alcohol levels may show intoxication.
  • Commonly abused drugs that may be detected in the urine include:

  • marijuana, or pot
  • cocaine
  • phencyclidine, or PCP
  • amphetamines
  • morphine, heroin, and codeine
  • barbiturates

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