All are biomarkers of long standing alcohol intake, EXCEPT:
GGT will be elevated in long standing alcoholism, but it lack sensitivity and specificity. Elevated MCV seen in chronic alcoholism. CDT is most widely studied but it lack sensitivity and specificity. 5' nucleotidase is an cholestatic marker. Ref : AASLD Practice Guidelines 2010
Carbohydrate deficient transferrin
GGT
5' nucleotidase
Macrocytosis