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Why was the instant result positive for THC, but the AIT Labs result was negative?

April 26, 2017ait Instant Labs negative positive THC

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Why was the instant result positive for THC, but the AIT Labs result was negative?

1 Answer

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Reason 1: Patient is taking a prescription medication known to cross react with the cup and result in a THC positive (e.g. protonics). Reason 2: THC metabolizes into several metabolites of which the cup cannot differentiate meaning that the cup response is an accumulative result. Laboratory analysis only detects the presence of carboxy-THC which may be at a concentration below the reporting limit.