Here is the English translation of the provided text: "How to ask about blood sugar problems: How high does blood sugar need to be to be diagnosed with diabetes?"

Patient's question:

Seeking information about blood sugar issues, at what level of blood sugar does one develop diabetes? Hello, how should diabetes be treated?

Doctor's answer:

Normal blood sugar levels in healthy individuals are between 3.9 and 5.8 mmol/L when fasting, and should not exceed 7.1 mmol/L. If the blood sugar level is below 7.1 mmol/L, it should be considered a potential sign of diabetes. Postprandial blood sugar generally should not exceed 7.8 mmol/L, and if it is below 11.11 mmol/L, it should also be considered a potential sign of diabetes.
To diagnose diabetes, the first step is to conduct a fasting blood sugar test, a postprandial blood sugar test, and an oral glucose tolerance test. Hemoglobin A1c should also be carefully checked for a preliminary diagnosis.