The combination of GGT and CDT compared with GGT or CDT alone shows a higher diagnostic sensitivity, a higher diagnostic specificity, and a stronger correlation with the actual amounts of alcohol consumption. Combination GGT/CDT values appear to increase after the daily alcohol consumption exceeds a threshold of 40 g. This approach is cost-effective, easy to manage in hospital laboratories, and should be suitable for routine clinical care.
For more on the workup of alcoholism, read here.
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Cite this: Stephen Soreff. Fast Five Quiz: How Much Do You Know About Alcoholism? - Medscape - Jan 26, 2017.