When reviewing a lab report, what does “Canceled: due to interference” mean?
Interference is an unknown signal that prevents accurate identification of drugs during the confirmation analysis. Its origin cannot be determined, but it may be an endogenous compound (a naturally occurring compound within the body), a prescription medication, or something added to the specimen after collection. In instances where a definite positive or negative result cannot be determined for a drug, the test is conducted three times. After the third attempt, if the drug in question still cannot be accurately determined, the test for that drug is cancelled.
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