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Fasting blood sugar testing is one of the most common laboratory tests used to evaluate blood glucose levels and help diagnose diabetes or prediabetes. This test measures the amount of glucose in your blood after you have not eaten for at least eight hours, typically overnight. Healthcare providers use fasting blood sugar tests to screen for diabetes, monitor existing diabetes, and assess how well treatment is working. The test is simple, requiring only a small blood sample drawn from a vein in your arm.

Normal fasting blood sugar levels generally fall between 70 and 99 milligrams per deciliter. If your fasting blood sugar level is between 100 and 125 milligrams per deciliter, you may have prediabetes, which means your blood sugar is higher than normal but not high enough to be classified as diabetes. A fasting blood sugar level of 126 milligrams per deciliter or higher on two separate occasions indicates diabetes. These cutoff values help healthcare providers identify people who are at risk for developing diabetes or who already have the condition.

Proper preparation is essential for accurate fasting blood sugar test results. You should not eat or drink anything except water for at least eight hours before the test, which is why these tests are usually scheduled in the morning. Certain medications, stress, illness, and physical activity can affect your blood sugar levels, so it is important to inform your healthcare provider about any medications you are taking or health conditions you have. Some people may need to adjust their medication schedule before the test, but this should only be done under medical supervision.

If your fasting blood sugar test results are abnormal, your healthcare provider may recommend additional testing to confirm the diagnosis. This might include a hemoglobin A1C test, which provides an average of your blood sugar levels over the past two to three months, or an oral glucose tolerance test, which measures how your body processes sugar over time. Regular monitoring of blood sugar levels is important for people with diabetes or prediabetes to prevent complications and maintain good health. Early detection through fasting blood sugar testing allows for timely intervention and better management of blood glucose levels.