Prediabetes is borderline diabetes. If you have this condition you are likely to develop type 2 diabetes and all its complications in the near future. According to researchers at the Johns Hopkins Bloomberg School of Public Health defining prediabetes based on haemoglobin A1C is the most accurate predictor of who will go on to develop long-term complications from diabetes. This is a common test that determines a long-term average blood sugar level. This prediabetes test can help people who are at high risk of developing diabetes. It can reduce the risk substantially through lifestyle modifications such as moderate weight loss