Introduction: Prediabetes or intermediate hyperglycemia (IH) represents a critical phase in the trajectory toward type 2 diabetes mellitus (T2DM). Recent evidence from the International Diabetes Federation (IDF) suggests that 1-hour OGTT (1HOGTT) ≥8.6 mmol/L is a more sensitive biomarker for early beta-cell dysfunction, with enhanced detection of IH and future T2DM risk. Conventional screening using hemoglobin A1c (HbA1c) or 2-Hour OGTT (2HOGTT) may delay identification of prediabetes, narrowing the window for early intervention. This study evaluates 1HOGTT as a screening tool for prediabetes among Malaysians. Methodology: This cross-sectional study enrolled adults without prior T2DM or prediabetes. Participants underwent 1HOGTT, 2HOGTT, and HbA1c, classified as per the Malaysian Clinical Practice Guideline for T2DM (6th Edition) and IDF 2024 criteria. Agreement between tests was assessed using McNemar’s test and Cohen’s kappa. Diagnostic accuracy was evaluated via receiver operating characteristic (ROC) curve analysis. Cost-effectiveness was determined using reagent cost only. Results: The majority of the 310 participants were female (71.6%), Malay (87.1%), with average age of 40. The 1HOGTT identified prediabetes in 21.6% (n = 67) compared to 17.1% (n = 53) by HbA1c and 2.6% (n = 8) by 2HOGTT. McNemar’s test confirmed statistically significant discordance between 1HOGTT and 2HOGTT (chi-square = 53.397, p <0.001): 61 participants were prediabetic by 1HOGTT but normal by 2HOGTT, versus only 2 in the reverse direction. No significant discordance was found between 1HOGTT and HbA1c (chi-square = 2.817, p = 0.093). 1HOGTT demonstrated excellent discriminatory ability against 2HOGTT (AUC = 0.908; 95% CI: 0.837–0.978), significantly outperforming HbA1c (AUC = 0.664; CI: 0.462– 0.867; DeLong p = 0.012). In a population-level cost analysis, 1HOGTT achieved lowest cost per prediabetes case detected (RM 5.79) – approximately 8.3 times and 8.1 times more cost-effective than 2HOGTT (RM 48.08) and HbA1c (RM 46.78) respectively. Conclusion 1HOGTT identifies a significant proportion of individuals with prediabetes missed by 2HOGTT and HbA1c. Incorporating 1HOGTT enhances the detection of prediabetes, is cost-effective, and enables timely preventive measures in our population with high diabetes burden.
Glucose Tolerance Test ; Glycated Hemoglobin ; Prediabetic State

Introduction: Type 2 diabetes mellitus is a major healthcare problem worldwide, yet high percentage of patients are undiagnosed. There is a dire need for effective screening strategies. We examine the use of modified Asian FINDRISC (M-FINDRISC) and POCT random capillary blood glucose (rCBG) for the detection of dysglycemia Methodology: This cross-sectional, observational study included 151 adults aged ≥30 years without a prior history of diabetes in healthcare and community settings. Hemoglobin A1c of ≥6.3% was used for the diagnosis of diabetes, and 5.7– 6.2% for prediabetes. Areas under the receiver operating curve (ROC-AUC) for M-FINDRISC were analyzed. The sensitivity and specificity of the combined use of M-FINDRISC and rCBG for the detection of dysglycemia were evaluated. Results: The mean age of the participants was 44.6 ± 11.0 years. They had high body mass index (27.8 ± 4.9 kg/m²). Most were sedentary (only 25.2% reported physical activities of ≥30 min/day). A total of 52.3% had first-degree relatives with diabetes, but less than 12% were taking antihypertensive medication. Out of 151 participants, 3.3% (n = 5) were diagnosed with diabetes mellitus and 37.7% (n = 57) with prediabetes, giving an overall prevalence of 41.1% for dysglycemia. The mean age of participants with dysglycemia was significantly older (47.9 vs. 42.3 years, p-value 0.002). Other parameters were not statistically different for the two groups. Mean M-FINDRISC score was 9.7 ± 3.9 in the normal and 10.8 ± 4.0 in the dysglycemic group, while rCBG was 6.4 ± 1.1 mmol/L and 7.1 ± 3.1 mmol/L, respectively. ROC-AUC of M-FINDRISC for dysglycemia was 0.561. A combined screening strategy (M-FINDRISC score ≥7.5 and CBG ≥7.8 mmol/L) yielded high specificity (89.9%) but low sensitivity (17.7%) for dysglycemia. Conclusion While the combined screening strategy utilizing M-FINDRISC and POCT random CBG improves specificity, M-FINDRISC showed limited predictive value for dysglycemia in this specific cohort, making it a less ideal tool for screening.