Introduction

The testing for drugs of abuse in the urine is an objective means to document a person's drug exposure. This procedure has been used effectively in a variety of settings including emergency departments for the diagnosis of drug overdose and in other clinical services such as pediatrics, obstetrics, psychiatry, addiction medicine, as well as in organ transplant for documentation and management of drug use or exposure.

From: Handbook of Drug Monitoring Methods Edited by: A. Dasgupta © Humana Press Inc., Totowa, NJ

The positive finding of a drug test is evidence of exposure to the drug but it does not, however, provide direct information on the person's history of use in terms of the nature of the exposure, when the exposure took place, the level of exposure ("dose"), and if the patient was under the influence of the drug at the time of urine collection.

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