special subjects
Amphetamines
Diagnosis ofAmphetamineUse
Usually a clinical diagnosis Testing as needed to exclude serious nondrug-related disorders (eg, causing altered mental status) Diagnosis ofamphetamineuse is usually made clinically, although when history of drug use and the diagnosis are unclear, tests are done as indicated for the undifferentiated patient with altered mental status, hyperpyrexia, or seizures. Evaluation may include CT, lumbar puncture, and laboratory tests to identify infections and metabolic abnormalities. Amphetamines are usually part of routine urine Drug Testing , which are done unless history of ingestion is clear; specific drug levels are not measured. Immunoassay urine screening tests for amphetamines may produce false-positive results and may not detect 