The qualitative immunoassay drug panel reports each sample as either positive or negative for a particular drug or drug class, based on predetermined cutoff concentrations [21, 69, 70].
Positive UDT results reflect recent use of the drug, because most substances in urine have detection times of only 1-3 days. Positive results do not provide enough information to determine the exposure time, dose, or frequency of use .
Ideally, a UDT would be positive if the patient took the drug (true positive) and negative if the drug was not taken (true negative). However, false-positive or false-negative results can occur for a number of reasons, so it is important to interpret the UDT results carefully .
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