Slightly lower blood glucose. Fasting Plasma Glucose is the amount of sugar in your blood when you wake up. It's required to power your body, but too much is very bad for you. Fasting plasma glucose between 5.6 mmol/L and 6.9 mmol/L (101 – 125 mg/dl) is considered pre-diabetes. Fasting plasma glucose higher than 7 mmol/L (126 mg/dl) is considered diabetes.