Aim: To establish reference interval of HbA1c IFCC in Thai.
Materials and methods: 699 whole blood samples were used. Samples had fasting plasma glucose >or=126 mg/dl (7.00 mmol/L), renal problem or hemoglobinopathy was excluded.
Results: Reference interval of HbA1c IFCC was 2.90-4.90%.
Conclusion: Effect of age should be determined.