Diabetes screening guidelines recommend different approaches depending on the patient population, risk factors, and available resources. Here are some of the key guidelines for diabetes screening:

1. American Diabetes Association (ADA): The ADA recommends that adults with a body mass index (BMI) of 25 or greater, and who have one or more additional risk factors for diabetes, be screened for diabetes every three years. Risk factors include a family history of diabetes, physical inactivity, high blood pressure, low HDL cholesterol, high triglycerides, a history of gestational diabetes, and a history of cardiovascular disease.
2. United States Preventive Services Task Force (USPSTF): The USPSTF recommends that adults aged 40 to 70 years who are overweight or obese be screened for abnormal blood glucose levels every three years. The recommendation is based on moderate evidence that screening and intensive lifestyle interventions can reduce the progression of type 2 diabetes in this population.
3. National Institute for Health and Care Excellence (NICE): NICE recommends that adults aged 40 to 74 years who are overweight or obese be offered a blood test to check for diabetes every five years. The recommendation is based on evidence that early detection and treatment of type 2 diabetes can prevent or delay complications.
4. World Health Organization (WHO): The WHO recommends that countries develop national guidelines for diabetes screening, based on local epidemiology and resources. The WHO also recommends that screening programs include a combination of risk assessment, point-of-care testing, and confirmatory laboratory testing.

It’s important to note that the guidelines may vary depending on the patient population, available resources, and clinical context. Therefore, healthcare providers should consult the most recent guidelines and consider individual patient factors when deciding on diabetes screening.