What Is a Fasting Blood Sugar Test?
A fasting blood sugar test checks the amount of sugar, called glucose, in your blood after you have not eaten for at least eight hours. Doctors often use this test to help find out if you have diabetes or prediabetes. Because it is simple and quick, many clinics in your area offer this test. The fasting blood sugar test is important for understanding your risk of health problems linked to blood sugar.
Why Is the Fasting Blood Sugar Test Done?
Doctors use this test for several reasons. First, it helps spot early signs of diabetes. Also, it can show if your blood sugar is too high or too low. For example, the test may be done if you have symptoms like:
According to the CDC, catching changes early can help prevent serious health issues later. Sometimes, your doctor may order this test as part of a routine checkup, especially if you have risk factors for diabetes.
How to Prepare for the Test
Before your fasting blood sugar test, you need to avoid eating or drinking anything except water for at least eight hours. Because food and drinks can raise your blood sugar, fasting gives the most accurate results. However, you can take your usual medicines unless your doctor says otherwise. If you are unsure, always check with your healthcare provider. For children, the fasting time may be shorter, so ask your doctor for advice.
How the Test Is Performed
During the test, a healthcare worker will clean your arm and use a small needle to take a blood sample. Usually, the process takes only a few minutes. Afterward, you can eat and drink as normal. Most people feel little or no pain. Because the test is quick, you can return to your daily activities right away.
Understanding Your Test Results
After the test, your doctor will share your results. Normal fasting blood sugar levels are usually between 70 and 99 milligrams per deciliter (mg/dL). If your number is higher or lower, your doctor will explain what it means. Interpreting blood sugar results can help you understand your health better. According to the American Diabetes Association, here are common ranges:
Because results can vary, your doctor may repeat the test to confirm your numbers.
What Do Abnormal Results Mean?
Sometimes, your fasting blood sugar may be too high or too low. High fasting blood sugar causes can include diabetes, stress, certain medicines, or illness. On the other hand, low blood sugar may result from not eating enough, taking too much insulin, or other health problems. If your results are not normal, your doctor may suggest more tests or changes to your care plan. According to the WHO, early treatment can help prevent complications.
Next Steps After Your Results
If your fasting blood sugar is high, your doctor may recommend lifestyle changes or medicine. Sometimes, you may need more tests, such as an A1C test, to check your average blood sugar over time. If your blood sugar is low, your doctor will look for causes and suggest ways to keep it in a safe range. Because everyone is different, your care plan will fit your needs.
Tips for Maintaining Healthy Blood Sugar Levels
There are many ways to support healthy blood sugar. For example, you can:
Because small changes can make a big difference, try to build healthy habits over time. If you want to know how to lower fasting blood sugar, talk with your healthcare provider for tips that work for you. Consult Dr. Akaash Kalasua for managing blood sugar and preventing diabetes.