Drug Screen, Prescription/OTC, Gastric
Clinical Information Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test
This test looks for a broad spectrum of prescription and over-the-counter (OTC) drugs. It is designed to detect drugs that have toxic effects, as well as known antidotes or active therapies that a clinician can initiate to treat the toxic effect. The test is intended to help physicians manage an apparent overdose or intoxicated patient, to determine if a specific set of symptoms might be due to the presence of drugs, or to evaluate a patient who might be abusing these drugs intermittently. The test is not designed to screen for intermittent use of illicit drugs.
Drugs of toxic significance that are not detected by this test are: digoxin, lithium, and many drugs of abuse/illicit drugs, some benzodiazepines, and some opiates.
Detection and identification of prescription or over-the-counter drugs frequently found in drug overdose or used with a suicidal intent.
This test is designed to provide, when possible, the identification of all drugs present.
The drugs that can be detected by this test are listed in Prescription and Over-the-Counter (OTC) Drug Screens Table 2 in Special Instructions.
Positive results are definitive.
Drugs of toxic significance that are not detected by this test include digoxin, lithium, many drugs of abuse/illicit drugs, some benzodiazepines, and some opiates. For these drugs, see Mayo Medical Laboratories' drug abuse surveys or drug screens or individual tests.
A detailed discussion of each drug detected is beyond the scope of this text. Each report will indicate the drugs identified. If a clinical interpretation is required, please request a Drug/Toxicology Lab consult (Mayo Clinic patients) or contact Mayo Laboratory Inquiry (Mayo Medical Laboratories clients).
Cautions Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances
Not intended for use in employment-related testing.
Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.
Clinical References Provides recommendations for further in-depth reading of a clinical nature
1. Tietz Textbook of Clinical Chemistry. 3rd edition. Edited by CA Burtis, ER Ashwood. Philadelphia, WB Saunders Company 1999, pp 913-917
2. Disposition of Toxic Drugs and Chemicals in Man. 5th edition. Edited by RC Baselt, RH Cravey. Foster City, CA, Chemical Toxicology Institute, 2000