Prediabetes

Screen asymptomatic adults aged 35 to 70 years with overweight or obesity for prediabetes and type 2 diabetes. Acceptable screening tests are HbA1c, fasting plasma glucose (FPG), and the 75-g oral glucose tolerance test (OGTT). The result should trigger a documented prevention plan rather than diagnosis alone. JAMA+2JAMANew USPSTF Recommendations for Screening for Prediabetes and Type 2 Diabetes: An Opportunity to CreateCDC[PDF] preventing chronic disease - CDCCDCPrevalence of Testing for Diabetes Among US Adults With Overweight or Obesity, 2016–2019

Order FPG when a fasting specimen is feasible and HbA1c when fasting access is a barrier. Use a 75-g OGTT when post-load dysglycemia is clinically important to resolve, including postpartum testing after gestational diabetes; the test requires overnight fasting followed by a standardized 75-g glucose load and plasma glucose measurement at fasting and 2 hours. jacc+1jacc2026 AHA/ACC/ADA/ASN Guideline for the Prevention ... - JACCNatureGlucose Tolerance Testing and Diabetes Risk Assessment | Endocrinology | Clinical Sciences | Health sciences | Topics | Nature Index

A single abnormal screening result establishes a prevention opportunity but does not identify a uniform-risk population. Most patients meet only one glycemic definition; documenting whether abnormalities are present on one, two, or all three tests improves risk discussion and prioritization of intensive intervention. WileyWileyReframing prediabetes: A call for better risk stratification and intervention - Kim - 2024 - Journal of Internal Medicine - Wiley Online Library

Classify glycemic burden by the number of abnormal prediabetes criteria. Patients with one abnormal criterion represent an elevated-risk group, whereas two abnormal criteria identify higher risk and all three identify very high risk for progression; this framework is useful when deciding how urgently to deploy intensive lifestyle treatment, pharmacotherapy, and follow-up. WileyWileyReframing prediabetes: A call for better risk stratification and intervention - Kim - 2024 - Journal of Internal Medicine - Wiley Online Library

Impaired fasting glucose and impaired glucose tolerance are not interchangeable phenotypes. FPG detects fasting dysglycemia, while OGTT identifies post-load dysglycemia; a patient with normal FPG may still have impaired glucose tolerance, and a patient with either phenotype warrants a prevention intervention. Nature+2NatureGlucose Tolerance Testing and Diabetes Risk Assessment | Endocrinology | Clinical Sciences | Health sciences | Topics | Nature IndexScienceDirectAssociations of HbA1c and fasting plasma glucose with incident diabetes: Implications for pre-diabetes thresholds in a Japanese population - ScienceDirectWileyMetformin: Therapeutic profile in the treatment of type 2 diabetes

A history of gestational diabetes materially changes preventive priority. In women with both prior gestational diabetes and prediabetes, a post hoc Diabetes Prevention Program analysis found that 12 months of lifestyle intervention or metformin improved glycemic control and reduced type 2 diabetes risk by 50% to 60% versus controls. jaccjacc2026 AHA/ACC/ADA/ASN Guideline for the Prevention ... - JACC

Refer patients with prediabetes to a structured combined diet, physical-activity, and behavioral program rather than offering unstructured counseling alone. The Diabetes Prevention Program intensive lifestyle intervention targeted approximately 7% loss of initial body weight through a low-calorie, low-fat dietary pattern plus at least 150 minutes weekly of moderate-intensity physical activity and reduced incident diabetes by 58%. jacc+1jaccPrimary Prevention of Cardiovascular Disease in Diabetes MellitusDiabetes JournalsThe National Clinical Care Commission Report to Congress: Leveraging Federal Policies and Programs to Prevent Diabetes in People With Prediabetes | Diabetes Care | American Diabetes Association

Make the prescription measurable: set an initial weight-loss target of approximately 7% of baseline weight, schedule at least 150 minutes per week of moderate-intensity activity, and use goal planning and self-monitoring of dietary intake, activity, and weight. Long-term follow-up data support sustained benefit from intensive lifestyle intervention. jacc+2jacc2026 AHA/ACC/ADA/ASN Guideline for the Prevention ... - JACCjaccPrimary Prevention of Cardiovascular Disease in Diabetes MellitusDiabetes JournalsThe National Clinical Care Commission Report to Congress: Leveraging Federal Policies and Programs to Prevent Diabetes in People With Prediabetes | Diabetes Care | American Diabetes Association

When access is limited, prioritize referral to an established diabetes prevention lifestyle-change program. National policy recommendations specifically emphasize improving clinician referral, payment coverage, and availability of National Diabetes Prevention Program and Medicare Diabetes Prevention Program services because screening without connection to intervention leaves preventable risk unaddressed. Diabetes JournalsDiabetes JournalsThe National Clinical Care Commission Report to Congress: Leveraging Federal Policies and Programs to Prevent Diabetes in People With Prediabetes | Diabetes Care | American Diabetes Association

Consider metformin for patients with prediabetes who remain at high risk after 3 to 6 months of intensive lifestyle management, particularly patients who are younger, have overweight or obesity, have worsening glycemia, or have high cardiovascular risk. This is a selective prevention strategy rather than routine drug treatment for every patient with one mildly abnormal glycemic result. WileyWileyMetformin: Therapeutic profile in the treatment of type 2 diabetes

Clinical trial and synthesis data describe preventive efficacy with metformin doses usually totaling at least 1,500 mg/day. In the Diabetes Prevention Program, metformin reduced diabetes incidence by 31% versus placebo over a mean 2.8 years, compared with a larger effect from intensive lifestyle intervention; the reduction persisted at 10 years, with an 18% lower diabetes incidence reported in follow-up. jacc+1jaccPrimary Prevention of Cardiovascular Disease in Diabetes MellitusPubMedThe Effectiveness of Metformin in Diabetes Prevention: A Systematic Review and Meta-Analysis - PMC

Use metformin as off-label prevention therapy in the United States; federal recommendations have called for FDA review and approval for diabetes prevention, underscoring that this is not an FDA-approved prevention indication. Check estimated glomerular filtration rate before prescribing and monitor renal function; published review data support use down to eGFR 30 mL/min/1.73 m² with appropriate caution and dose/renal monitoring. Wiley+1WileyMetformin: Therapeutic profile in the treatment of type 2 diabetesDiabetes JournalsThe National Clinical Care Commission Report to Congress: Leveraging Federal Policies and Programs to Prevent Diabetes in People With Prediabetes | Diabetes Care | American Diabetes Association

At follow-up, repeat the glycemic modality that identified the abnormality when possible, reassess weight and weekly activity against the approximately 7% and 150-minute targets, and determine whether the patient enrolled in and is attending a structured program. Failure to enroll is a treatment failure of access or implementation, not simply a patient preference issue. jacc+2jacc2026 AHA/ACC/ADA/ASN Guideline for the Prevention ... - JACCjaccPrimary Prevention of Cardiovascular Disease in Diabetes MellitusDiabetes JournalsThe National Clinical Care Commission Report to Congress: Leveraging Federal Policies and Programs to Prevent Diabetes in People With Prediabetes | Diabetes Care | American Diabetes Association

Escalate prevention intensity when glycemia worsens, when a second or third prediabetes criterion becomes abnormal, or when lifestyle targets are not being met despite structured support. Multiple abnormal glycemic criteria identify progressively higher diabetes risk and provide a practical trigger to revisit metformin, social barriers, and program delivery. Wiley+1WileyReframing prediabetes: A call for better risk stratification and intervention - Kim - 2024 - Journal of Internal Medicine - Wiley Online LibraryWileyMetformin: Therapeutic profile in the treatment of type 2 diabetes

Postpartum follow-up requires particular rigor: complete the 4- to 12-week OGTT after gestational diabetes, identify prediabetes or diabetes promptly, and continue metabolic risk-factor optimization because prior gestational diabetes confers a high-risk prevention phenotype. jaccjacc2026 AHA/ACC/ADA/ASN Guideline for the Prevention ... - JACC