A hemoglobin A1C test is a blood test that measures a person's average blood glucose level over the previous three months.
Hyperglycemia (also known as high blood sugar) is a condition in which a person's blood glucose level is higher than normal.
Diabetes is a condition in which the body either does not produce insulin or does not use it properly. Learn about symptoms and treatment.
Type 2 diabetes is a chronic disease in which the body is unable to properly make use of insulin, leading to high blood glucose levels.
Type 1 diabetes is a chronic disease in which the body makes little to no insulin, resulting in high blood glucose levels.
Yale Medicine has one of the country’s first renal (kidney) pathology labs and deep expertise in diagnosing the disease. Learn how this condition is diagnosed.