Evaluation of a radioimmunoassay (125I) kit for cannabinoid metabolites in urine and whole blood.

The Abuscreen kit (Roche Diagnostics) for the analysis of 11-nor-delta 9-tetrahydrocannabinol-9-carboxylic acid and other cannabinoids in urine was evaluated in terms of its accuracy, reproducibility, and sensitivity. A procedure is also presented for the analysis of total cannabinoids in whole blood using the RIA kit.