Screen of drug use: Diagnostic accuracy for cannabis use disorder

Objective: As cannabis has been legalized for medicinal and recreational use, rates of cannabis misuse and cannabis use disorder (CUD) have increased. However, only a small percentage of individuals with CUD seek treatment. A practical screening instrument is needed to detect CUD in primary care (PC) to address the needs of individuals with CUD. This study seeks to validate the 2-item Screen of Drug Use (SoDU) to help detect CUD in the PC setting.

Method: We used archival data from 1283 patients recruited in the Department of Veterans Affairs (VA) PC clinics. A total of 51 individuals (4%) met DSM-IV criteria for CUD (abuse or dependence; with or without other drug use disorders). A diagnosis of CUD based on the Mini International Diagnostic Interview (MINI) was used as the criterion. Concurrent diagnostic properties of the SoDU were examined against the MINI.

Results: The SoDU was 100% sensitive (95% confidence interval [CI], 93.00% - 100%), and 87.50% specific (95% CI, 85.53% - 89.23%). When tested in subgroups of patients varying in age, gender, race/ethnicity, marital status, educational level, and PTSD status, the SoDU maintained 100% sensitivity in all subgroups; specificity ranged from 76.26% to 94.34%.

Conclusions: The SoDU is an appropriate instrument to help identify CUD in primary care. It is brief, easy to use, and has good concurrent diagnostic validity for diverse groups of patients.