Why some time drug screening results higher than conformation results and vice virsa?

Abdul Aziz Khalfan Al Bahri @Abdul-Aziz-Al-Bahri

13 December 2021 1 6K Report

In our daily drug analysis. We note sometimes the screening results are higher than the confirmation. For example, THC is in most time the screening concentration is higher than the confirmation.

Any answer or comment is really appreciated.

Daniel Michael Strickland

Depends on what test you are using. In my opinion quantifying urinary THC (or carboxy THC) concentrations provides no clinically useful information. Virtually all POC tests just say positive or negative. Because THC is sequestered in fatty tissue and can be present for a long time, it certainly does not tell you how much, nor when the cannabis was smoked/ingested.

Is this important for research purposes?

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