Diabetes is typically diagnosed by a blood test showing unusually high blood sugar. The World Health Organization defines diabetes as blood sugar levels at or above 7.0 mmol/L <unk> 26 mg/dL) after fasting for at least eight hours, or a glucose level at or above<unk> 1.1 mmol/L (200 mg/dL) two hours after an oral glucose tolerance test. The American Diabetes Association additionally recommends a diagnosis of diabetes for anyone with symptoms of hyperglycemia and blood sugar at any time at or above<unk> 1.1 mmol/L, or glycated hemoglobin (hemoglobin A1C) levels at or above 48 mmol/mol. Once a diagnosis of diabetes is established,<unk>  is distinguished from other types by a blood test for the presence of autoantibodies that target various components of the beta cell. The most commonly available tests detect antibodies against glutamic acid decarboxylase, the beta cell cytoplasm, or insulin, each of which are targeted by antibodies in around 80% of type<unk>  diabetics. Some healthcare providers also have access to tests for antibodies targeting the beta cell proteins IA-2 and ZnT8; these antibodies are present in around 58% and 80% of type<unk>  diabetics respectively. Some also test for C-peptide, a byproduct of insulin synthesis. Very low C-peptide levels are suggestive of<unk> .
Type 1 diabetes
Diabulimia
Type 3 diabetes
Type 3c diabetes
Maturity onset diabetes of the young
Cystic fibrosis–related diabetes
Lipoatrophic diabetes
Type 2 diabetes