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Congenital disorders of glycosylation (CDG) are a family of rare inherited metabolic disorders. This study aimed to examine the carbohydrate-deficient transferrin (CDT) screening results of 1,328 patients with suspected CDG by using transferrin- high pressure liquid chromatography (Tf- HPLC) method and to evaluate the performance of the method as a reference diagnostic tool.Relative CDT levels (CDT concentrations expressed as percent of total transferrin) were determined in serum samples by HPLC. The method sensitivity, specificity and positive predictive value (PPV) were further calculated.Abnormal transferrin isoform profile consistent with CDG Type-I and CDG Type-II were determined in 50 cases; in 44 cases asiolo-Tf (7.63 ± 5.44 %) and disialo-Tf (36.29 ± 9.04 %), in six cases monosialo-Tf (3.95 ± 0.95 %) and trisialo-Tf (25.05 ± 4.46 %) were determined and decreased tetrasialo-Tf (49.75 ± 11.59 %) was identified in all cases. Two cases having abnormal CDT pattern were molecularly diagnosed with hereditary fructose intolerance and galactosemia and 11 cases diagnosed with CDG based on clinical and molecular analysis showed a normal pattern. The sensitivity, specificity and positive predictive values of Tf-HPLC method were 81.96 %, 99% and 96 %, respectively.Tf-HPLC is a useful, highly sensitive, cost-advantageous and reliable method for the detection and preliminary diagnosis of CDG for laboratories working with large sample series. [ABSTRACT FROM AUTHOR]