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Carbohydrate-deficient transferrin (CDT) has been proposed as the most efficient marker of alcohol abuse. Absolute and relative concentrations of CDT were measured with a commercial assay (%CDTTIA from AXIS-Shield, Oslo, Norway) using rate nephelometry for transferrin determination. One hundred eightyeight alcoholic patients (154 males, 34 females) and 132 control patients (113 males, 19 females) were included in the study. Within-run and day-to-day imprecision were 3.15% and 9.77%, respectively. The calibration curve was stable for more than 4 months with a shift below 5%. The commercial assay lacked sensitivity (Se = 0.48), but was highly specific (Sp = 0.98). Lowering the cut-off from 6% to 4.6% raised the sensitivity of the %CDTTIA test to 0.76 with a specificity of 0.90. We conclude that this adaptation to the Array Protein System (Beckman-Coulter) is suitable for routine use and offers precise results. It, however, requires an adaptation of the cut-off value for patients and of the target value for kit controls.

Carbohydrate-Deficient Transferrin (CDT) Determination by Nephelometry Using a Commercial Kit. Analytical and Diagnostic Aspects