| Autor: |
Mullen, Lawrance D, Hart, E. Dale, Vikingsson, Svante, Winecker, Ruth E, Hayes, Eugene, Flegel, Ron |
| Předmět: |
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| Zdroj: |
Journal of Analytical Toxicology; Sep2023, Vol. 47 Issue 7, p557-562, 6p |
| Abstrakt: |
Because of structural similarities, the presence of 11-Nor-9-carboxy-∆8-tetrahydrocannabinol (∆8-THC-COOH) in a urine specimen might interfere with testing for 11-Nor-9-carboxy-∆9-tetrahydrocannabinol (∆9-THC-COOH). A set of samples containing ∆8-THC-COOH with concentrations ranging from 10 to 120 ng/mL were tested at cut-offs of 20, 50 and 100 ng/mL using cannabinoid immunoassay reagents from three different manufacturers. Cross-reactivities ranged from 87% to 112% for ∆8-THC-COOH at the cut-off of 50 ng/mL for the three different platforms. Additionally, samples containing both ∆8-THC-COOH and ∆9-THC-COOH were fortified by the National Laboratory Certification Program (NLCP). U.S. Department of Health and Human Services (HHS)–Certified Laboratories tested the samples to determine the interference of ∆8-THC-COOH on confirmatory tests commonly used in workplace drug testing laboratories for the confirmation and quantification of ∆9-THC-COOH. When evaluating confirmation and quantification of ∆9-THC-COOH in the presence of ∆8-THC-COOH, unreportable results for ∆9-THC-COOH were observed because of chromatographic interference or mass ratio failures. However, there were no false-positive ∆9-THC-COOH reports from any HHS - certified laboratory. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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