Screening can identify patients with prediabetes. Diabetes UK has a risk score assessment tool. 

Risk groups include non-pregnant people aged 40 years and over, people of South Asian and Chinese descent aged 25-39 years, and other adults with co-morbidities that increase the risk of type 2 diabetes. Co-morbidities include hypertension, obesity, stroke, non-alcoholic fatty liver disease, polycystic ovary syndrome, cardiovascular disease, history of gestational diabetes mellitus and mental health disorders. Risk can also be assessed using the NHS Health Check if pharmacies are commissioned to provide this.

If the initial assessment suggests a high risk, the patient should be referred to their GP surgery for blood tests to determine the risk of progression to type 2 diabetes or identify possible type 2 diabetes.