AIMS/INTRODUCTION: Studies on the relative contributions of fasting and postprandial hyperglycemia (FH and PPH) to glycated hemoglobin (HbA ) in patients with type 2 diabetes have yielded inconsistent results. We aimed to assess the relationship by using continuous glucose monitoring in a multi-ethnic cohort. MATERIALS AND METHODS: A total of 100 adults with type 2 diabetes were assessed with 6-day continuous glucose monitoring and HbA . Area under the curve (AUC) ≥5.6 mmol/L was defined as AUC . AUC equal to or greater than each preprandial glucose for 4-h duration was defined as AUC . The total PPH (AUC ) was the sum of the various AUC The postprandial contribution to overall hyperglycemia was calculated as (AUC / AUC ) × 100%. RESULTS: The present study comprised of Malay, Indian, and Chinese type 2 diabetes patients at 34, 34 and 28% respectively. Overall, the mean PPH significantly decreased as HbA advanced (mixed model repeated measures adjusted, beta-estimate = -3.0, P = 0.009). Age (P = 0.010) and hypoglycemia (P = 0.006) predicted the contribution difference. In oral antidiabetic drug-treated patients (n = 58), FH contribution increased from 54% (HbA 6-6.9%) to 67% (HbA ≥10%). FH predominance was significant in poorly-controlled groups (P = 0.028 at HbA 9-9.9%; P = 0.015 at HbA ≥10%). Among insulin users (n = 42), FH predominated when HbA was ≥10% before adjustment for hypoglycemia (P = 0.047), whereas PPH was numerically greater when HbA was <8%. CONCLUSIONS: FH and PPH contributions were equal in well-controlled Malaysian type 2 diabetes patients in real-world practice. FH predominated when HbA was ≥9 and ≥10% in oral antidiabetic drug- and insulin-treated patients, respectively. A unique observation was the greater PPH contribution when HbA was <8% despite the use of basal and mealtime insulin in this multi-ethnic cohort, which required further validation.