Carbohydrate-deficient transferrin as a marker of alcohol consumption in male patients with liver disease

Carbohydrate-deficient transferrin (CDT) has been proposed as a marker of alcohol abuse, However, its value in patients with associated liver disease is still controversial, The aim of the study was to investigate the usefulness of CDT as a marker of alcohol consumption in patients with liver disease. We measured serum levels of CDT and those of commonly used hematological and biochemical markers, mean corpuscular volume (MCV), transaminases (AST and ALT), and gamma-glutamyltransferase in 179 male subjects divided into four groups: 45 active drinkers (13 with normal liver, 21 with fibrosteatosis, and 11 with liver cirrhosis), 45 abstinent chronic alcoholics (18 with and 27 without liver disease), 58 patients with nonalcoholic liver disease, and 31 healthy controls. Serum CDT in active alcoholics was 37.5 +/- 3.6 units/liter, being significantly higher than that of abstinent alcoholics (20.3 +/- 1.5 units/liter), patients with nonalcoholic liver disease (18.1 +/- 1.1 units/liter), and controls (13.1 +/- 0.8 units/liter). Contrary to the other markers, no significant differences were observed in CDT values in relation with the presence and severity of liver disease in either the active drinkers or in the abstinent alcoholics. The sensitivity and specificity of CDT as a marker of alcoholism in the series as a whole was 64% and 82%, respectively, similar to the best conventional marker, MCV (64 and 82%). In patients with liver disease, CDT maintained good sensitivity (72%) and specificity (83%). Receiver operating characteristic analysis confirmed that CDT had a similar diagnostic value to that of MCV, but better than gamma-glutamyltransferase and transaminases for the detection of alcohol abusers, The good diagnostic efficacy of CDT remained unchanged when analyzing only patients with liver disease, We conclude that serum CDT is a good marker of alcoholism and is less influenced than the currently used biochemical markers for associated liver disease, Thus, CDT is an effective laboratory test to detect alcohol abuse regardless of the presence of alcoholic liver disease.