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Clinical Chemistry 46: 1894-1902, 2000;
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(Clinical Chemistry. 2000;46:1894-1902.)
© 2000 American Association for Clinical Chemistry, Inc.

Articles

Should We Use Carbohydrate-deficient Transferrin instead of {gamma}-Glutamyltransferase for Detecting Problem Drinkers? A Systematic Review and Metaanalysis

Kay Scouller1, Katherine M. Conigrave1,a, Petra Macaskill, Les Irwig and John B. Whitfield2

1 Drug and Alcohol and
2 Biochemistry Departments, Royal Prince Alfred Hospital, Missenden Rd., Camperdown, NSW 2050, Australia.
a Address correspondence to this author at: Drug and Alcohol Department, Royal Prince Alfred Hospital, Missenden Rd., Camperdown, NSW 2050, Australia. Fax 61-2-9515-8970; e-mail katec{at}med.usyd.edu.au

Background: Carbohydrate-deficient transferrin (CDT) has been used as a test for excessive alcohol consumption in research, clinical, and medico-legal settings, but there remain conflicting data on its accuracy, with sensitivities ranging from <20% to 100%. We examined evidence of its benefit over a conventional and less expensive test, {gamma}-glutamyltransferase (GGT), and compared the accuracy of different CDT assay methods.

Methods: We performed a systematic review using summary ROC analysis of 110 studies prior to June 1998 on the use of CDT in the detection of alcohol dependence or hazardous/harmful alcohol use.

Results: We identified several potential sources of bias in studies. In studies examining CDT and GGT in the same subjects, subject characteristics were less likely to influence the comparison. In such paired studies, the original Pharmacia CDT assay was significantly more accurate than GGT, but the modified CDTect assay did not perform as well as the original and was not significantly better than GGT. The accuracy of the AXIS %CDT assay was statistically indistinguishable from modified CDTect. Several CDT assay methods appeared promising, in particular, liquid chromatography (chromatofocusing, HPLC, fast protein liquid chromatography) and isoelectric focusing, but there were insufficient paired studies from which to draw firm conclusions.

Conclusions: In studies published before June 1998, the results obtained with commercially available CDT assays were not significantly better than GGT as markers of excessive alcohol use in paired studies. Further high-quality studies comparing CDTect (modified) and other CDT assays with GGT in the same subjects are needed.




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