Carbohydrate-deficient transferrin (CDT) as a biomarker in persons suspected of alcohol abuse.

The coherence of carbohydrate-deficient transferrin (CDT) as a biomarker of alcohol abuse was investigated with 15 conventional laboratory parameters, with the self-reported medical history and with clinical findings, all previously reported to be associated with chronic alcohol intake. In total, 100 male persons who were at least suspected of abusing alcohol were assessed. Medical history, clinical picture and physical examination were taken, and laboratory parameters regarding blood count, liver enzymes, serum lipids, iron balance, Ig A and uric acid were determined. These data were correlated with the CDT values, the daily ethanol intakes reported, and several findings from medical history and clinical examination. The mean CDT level (mean+/-S.D.) of the entire group was 29.4+/-19.7 U/l. Eighty-one patients admitted a daily ethanol intake of 60 g or more. The ratio AST/ALT (de Ritis ratio) appeared as the best conventional parameter correlated with both CDT and ethanol intake. Mean corpuscular volume (MCV), serum iron, AST and red blood cell count also correlated significantly with CDT. CDT, AST and ferritin correlated significantly with the reported daily ethanol intake. It is concluded that CDT provides a reliable estimate of long-term alcohol intake.