A normal fasting blood glucose level is lower than 95 mg/dL (5.3 mmol/L).....One hour after drinking the glucose solution, a normal blood glucose level is lower than 180 mg/dL (10 mmol/L)......Two hours after drinking the glucose solution, a normal blood glucose level is lower than 155 mg/dL (8.6 mmol/L)...... If one of the tests is higher than normal, you'll likely need to test again in four weeks. If two or more of the tests are higher than normal, you'll be diagnosed with gestational diabetes...