CDT, GGT, and AST As Markers of Alcohol Use: The WHO/ISBRA Collaborative Project

CDT was little better than GGT in detecting high- or intermediate-risk alcohol consumption in this large, multicenter, predominantly community-based sample. As the two tests are relatively independent of each other, their combination is likely to provide better performance than either test alone. Test interpretation should take account sex, age, and body mass index.