The only definitive way to know is to do a blood test, and a fasting level would be ideal. If the level is 7 or more and you have associated symptoms, then you would have diabetes. Without a blood test, then suggestive symptoms are weight loss, increased thirst, passing large amounts of urine, blurred vision, and tiredness. Certainly you are very underweight, and if the weight loss is recent and the glucose levels are normal, then you will need to have other causes looked for.
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