High blood glucose, also known as hyperglycemia, is a condition where the level of glucose in the blood is too high. The normal range of blood glucose levels varies depending on the individual and the time of day, but in general, high blood glucose is considered to be above 160 mg/dL. However, for people with diabetes, hyperglycemia is usually considered to be a blood glucose level greater than 180 mg/dL one to two hours after eating.

Symptoms of hyperglycemia develop slowly over several days or weeks, and the longer blood sugar levels stay high, the more serious symptoms may become. Some of the symptoms of hyperglycemia include being very thirsty, being very tired, having blurry vision, and having to urinate often. If blood glucose levels remain high for long periods of time, it can lead to complications such as eye disease, kidney disease, heart attacks, and strokes.

For people who have diabetes, the American Diabetes Association recommends the following target blood sugar levels:

• Between 80 and 130 mg/dL (4.4 and 7.2 mmol/L) before meals
• Less than 180 mg/dL (10 mmol/L) two hours after meals

It is important to note that blood glucose targets may vary depending on the individual and their overall medical health. Therefore, it is essential to consult with a healthcare provider to determine an appropriate target for blood glucose levels. If blood glucose levels are often high, above 10mmol, it is recommended to contact a diabetes healthcare team for review of treatment.