Summary When Using Urine Drug Testing UDT

1. Immunoassay screening

• Laboratory-based or at point of care

• Classify substances as present or absent

• Presumptive positives

2. Confirmatory and quantitative laboratory-based specific drug identification by GC/MS standard


• Immunoassays report each sample as positive or negative for particular drug/class based on predetermined cut-offs

• Positive UDT results reflect recent drug use but cannot determine exposure time, dose, or frequency of use.

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Drug Addiction

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