A client presents to the office requesting a refill of Adderall. The psychiatric mental health nurse practitioner suspects diversion and orders a urine drug screen. The urine drug screen is negative for amphetamine and positive for cocaine. What do the results indicate?

Choice A reason: While a negative amphetamine screen suggests no use in the last 2 to 3 days, stating cocaine was used in the last 8 hours is too specific. Benzoylecgonine, the cocaine metabolite, is detectable for significantly longer than 8 hours, making this choice an inaccurate representation of the metabolic window. Choice B reason: Stating the client has not taken Adderall in the last 5 days is a plausible but less precise estimate than the standard 48 to 72 hour detection window for amphetamines. While the cocaine result is possible for a one-week window, the amphetamine window is typically shorter than 5 days. Choice C reason: A negative result for amphetamines strongly indicates no ingestion within the last 48 hours. However, the 5-day window for cocaine is slightly narrower than the maximum detectable limit for chronic users. While this is scientifically plausible, choice D represents the standard clinical interpretation of drug detection windows more broadly. Choice D reason: Amphetamines like Adderall typically remain detectable in urine for approximately 2 to 3 days. A negative result suggests non-compliance for at least 48 hours. Cocaine metabolites, specifically benzoylecgonine, can be detected for up to 2 to 4 days in occasional users and up to 1 week in chronic users.