The results obtained from 85 antidiabetic centers enrolled in the DAI study are presented with regard to the external quality assessment scheme for glycohemoglobin. The materials have been prepared by a laboratory of the network of reference laboratories of the International Federation of Clinical Chemistry (IFCC). To each control a Diabetes Control and Complications Trial (DCCT) traceable target value was assigned. The High-Performance Liquid Chromatography (HPLC) methods for glycohemoglobin are used in 75% of the centers, the immunochemical techniques in 21% and less than 5% is using affinity chromatography based methods. The data collected from the laboratories who completed the set of measurements show that 64% of the centers are well aligned to the DCCT system. The reproducibility of the methods varied between 3.7 and 5.8% (as CV, %) and has to be improved.