you are monotiring the blood glucose you need to remember these values. early morning in empty stomach if you take a blood sugar test it should be with in 100mg/dl. and 2 hours after consuming food the test should read less than 135mg/dl. regarding low blood sugar it is the symptoms not the values which is important. if you get symptoms like sweating, increased heart beat, bluring of vision, feeling of tierdness, dizziness and in severe cases momentery loss of consiciousness, all these indicate low sugars in blood