Glucose - Fasting
A fasting blood glucose test is usually performed in the morning before you've eaten breakfast. If should be performed at least 8 hours after you have had anything to eat or drink (except water).It measures the level of sugar in your blood and is an indicator of how well your body is metabolising sugars to store in your cells as glycogen.
What might a low result mean?
Sugar is normally well regulated so it is unusual to have low sugar levels. However there are several conditions which may cause your glucose levels to drop, often resulting in symptoms such as headache, sweating, palpitations and anxiety.
What might a high result mean?
Very high levels of glucose can indicate possible prediabetes or diabetes. These often, but not always, go hand in hand with symptoms such as lethargy, frequent urination and being thirsty all the time.