<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello doctors, I was wondering what the normal blood glucose levels are for a 17 year old female who weighs 187 lbs. I understand that her wieight is an issue as well, but please answer the question. I was wondering this because she seems to be less focused and feel tired.  <response>: Welcome to Chat Doctor. I am Chat Doctor. Normal value of random blood sugar should be less than 140 mgDL. If the level of sugar is between 140 mgDL and 200 mgDL, the patient is diagnosed with prediabetes. If the level exceeds 200 mgDL, then the patient is diagnosed with diabetes. Fasting Blood Sugar 8 hrs fasting is required- It is the first test performed to diagnose diabetes. The normal range for people with no diabetes is lower than 100 milligrams of glucose per deciliter of blood mgDL. If the level of glucose in the blood is between 100 mgDL and 125 mgDL, this indicates that the patient has a condition known as prediabetes. My dear friend, I advise you for FBS, PPBS and Urine test if you are suspecting diabetes. She should start daily brisk walking for 30 minutes and decrease fatty foods. Thanx for query. 