Diagnosis of Diabetes in Children and Adolescents Fasting plasma glucose level ≥ 126 mg / dL (≥ 7.0 mmol / L) Random glucose level ≥ 200 mg / dL (≥ 11.1 mmol / L) Glycosylated hemoglobin (HbA1c) ≥ 6.5% (≥ 48 mmol / mol) Sometimes oral glucose tolerance testing (For recommendations about diagnosis, see also the American Diabetes Association's 2022 standards of medical care in diabetes for children and adolescents and the International Society for Pediatric and Adolescent Diabetes' (ISPAD) 2018 guidelines for diabetes in children and adolescents.)