Glucose in Plasma (Fasting) is a test conducted to measure the level of glucose in the blood after fasting for 8 to 12 hours. A blood sample is drawn from a vein, and this sample is used to determine the glucose level in the plasma. This test is essential for diagnosing and monitoring diabetes, as it helps evaluate how the body responds to glucose. It is recommended for individuals showing symptoms of diabetes or those at risk, such as those with obesity or a family history of diabetes. Normal fasting plasma glucose levels typically range from 70 to 100 mg/dL, and a level above 126 mg/dL is considered a sign of diabetes.