Blood glucose over 14mmol/L, no matter fasting, postprandial or random blood glucose value, has been significantly higher than normal, consider the possibility of diabetes mellitus, if not timely diagnosis and treatment, hyperglycemia may lead to a number of serious acute or chronic complications. 1. Blood glucose more than 14mmol/L may have no obvious symptoms, if left untreated, the continuous elevation of blood glucose may lead to ketoacidosis, hyperosmolar coma and other acute complications. 2. Long-term hyperglycemia may lead to atherosclerosis, microangiopathy and neuropathy, and clinically, chronic complications such as stroke, coronary heart disease, diabetic nephropathy, diabetic retinopathy, peripheral neuropathy and diabetic foot may occur. Elevated blood glucose is recommended to consult a doctor in a timely manner, under the guidance of a specialist for examination and treatment.