Fasting Plasma Glucose Test
A fasting plasma glucose test is performed after the patient has gone at least 12 hours without food or drink (except for water). Like the random plasma glucose test
, it is performed by having a blood test and having the Blood glucose
levels analyzed by a laboratory.
What makes the fasting plasma glucose test different from the random plasma glucose test is that through fasting the body of a person without diabetes will produce and process insulin in response to increased glucose in the blood. For a person with diabetes, the body will not have that same response and their blood glucose levels will remain high. Receiving two readings of blood glucose levels of 140 mg/dl or over usually means the person has diabetes. A normal level for a person without diabetes should be in the 70-110 mg/dl range after fasting.