Is postprandial blood sugar 15 serious?

Postprandial blood glucose 15 is very serious, blood glucose evaluation criteria is random blood glucose less than 11.1mmol/L, this time postprandial blood glucose is 15mmol/L, has seriously exceeded the standard, need timely treatment, otherwise it will cause diabetes. It is recommended that daily blood glucose test, postprandial blood glucose and fasting blood glucose should be monitored together.