Although high blood sugar is an important marker of diabetes, it cannot be used alone as a basis for diagnosing diabetes. To make an exact diagnosis, we need to consider a number of factors holistically.
The fasting blood glucose level is a key reference indicator if the fasting blood glucose level is higher than or equal to 7 on more than two consecutive occasions0 mmol L (equivalent to 126 mg DL), then the probability of diabetes is high.
In addition, random blood glucose levels are also an important reference standard. If the random blood glucose test result is higher than or equal to 11 at any time pointDiabetes mellitus is preliminarily diagnosed when 1 mmol L (equivalent to 200 mg DL) is accompanied by diabetes-related symptoms such as polyuria, thirst, and weight loss. 
In addition to the above two indicators, the oral glucose tolerance test is also an extremely important diagnostic tool. After receiving a certain amount of glucose solution, it is possible to more accurately determine whether diabetes is present by observing the changes in blood sugar levels. 
Finally, glycosylated hemoglobin (HbA1C) is also a diagnostic criterion that cannot be ignored. If the HbA1c level is higher than or equal to 65% (equivalent to 48 mmol mol), then diabetes can also be diagnosed. To sum up, diagnosing diabetes is a process that requires comprehensive consideration of multiple factors, and cannot be judged by a single indicator. An accurate diagnosis can only be made if all indicators and symptoms are taken into account.
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