Screening for cannabinoids in blood using EMIT: Concentrations of Δ-9-Tetrahydrocannabinol in relation to EMIT results
✍ Scribed by Hallvard Gjerde
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 283 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0379-0738
No coin nor oath required. For personal study only.
✦ Synopsis
The EMIT d.a.u. cannabinoid assay of methanolic extracts of blood was found to be usable as a screening method in cases of suspected impairment by cannabis, when delta-9-tetrahydrocannabinol (THC) was analysed in the subsequent assay. A prerequisite is that the blood sample is taken some time after cannabis smoking. When a cut-off limit corresponding to 50 nM delta-9-tetrahydrocannabinol carboxylic acid (17 ng/ml) was used, 86% of the EMIT positive blood samples contained THC concentrations above the cut-off limit of 1 nM (0.3 ng/ml). A high EMIT result gave a high probability of finding a high THC concentration in the subsequent confirmation analysis.