As long you're not feeling faint or weak, you should be free to leave as soon as the test is complete. If you're feeling a dizzy, you may be asked to sit in the waiting room for a few minutes.
This would be the time to have a snack to replenish low blood sugar levels as a result of fasting. After your blood draw, you can head home or get back to your day.
Keep an eye on the puncture site to make sure the bleeding has stopped; note if there's any bruising, swelling, or infection. Bruising should go away on its own in a few days, but swelling and infection may require medical attention.
Depending if your test took place in your healthcare provider's office or in a lab, results may take anywhere from the same day to up to a week to arrive. Healthcare providers interpret FPG test results by looking at glucose levels in the blood. If your FPG test results are borderline or elevated and indicate diabetes, the test will need to be repeated a second time in the near future or other tests might be performed, such as the hemoglobin A1C test, oral glucose tolerance test , or the postprandial plasma glucose test.
Results may vary from lab to lab—or even in the same lab—from day to day. As a result, two abnormal results from tests taken on two different days are required to confirm a diagnosis. Results may be lower if blood is drawn in the afternoon rather than in the morning. A glucose level sometimes can be falsely low if too much time passes between when the blood is drawn and the lab processes the sample. The results can also be affected by previous or current medical conditions or by personal habits, such as smoking and exercise.
Abnormal test results may also indicate diabetes. Keep in mind that this blood test is used not only to diagnose diabetes but also to prevent it. Higher values are likely to reflect diet and lifestyle issues as well as poor insulin functioning.
Depending on your confirmed results, there are several courses of action. In that case, you and your healthcare provider will discuss setting up a treatment plan. Depending on the type of diabetes you have, it may include regular glucose monitoring, medication, and supplements, along with lifestyle changes, such as a whole foods, low-carb diet, exercise, and stress reduction practices.
There are several reasons for having a high FPG that may not be due to diabetes:. Your healthcare provider will be able to track your symptoms and perform more tests to rule these other conditions out if necessary.
Having prediabetes doesn't mean you'll automatically develop type 2 diabetes, however. Prediabetes and type 2 diabetes, for that matter are reversible conditions. These conditions will also require further testing and symptom tracking by your healthcare provider.
Depending on your results, if you're using the FPG test to monitor your fasting glucose levels, your healthcare provider may want to adjust your medication or treatment plan according to how your levels present.
If you're diagnosed with diabetes based on confirmed readings from an FPG test, your healthcare provider will then attempt to define which type. Whether a person has type 1, type 2, or gestational diabetes, a healthy lifestyle helps insulin to work better. In this sense, the fasting plasma glucose test is a signal for action, not a cause for despair. Keep an open dialogue with your healthcare provider about your results from the FPG test and which steps you should take next.
Get our printable guide for your next healthcare provider's appointment to help you ask the right questions. The fasting blood glucose test is a noninvasive blood test that can be used to determine diabetes risk, diagnose diabetes, and evaluate blood sugar and insulin function in those people who have diabetes. Abnormal results can help guide you to make lifestyle changes and determine medication adjustments if needed. We know healthy eating is key to help manage diabetes, but that doesn't make it easy.
Our free nutrition guide is here to help. Sign up and receive your free copy! American Diabetes Association. Diabetes Care. Hypoglycemia low blood sugar. Diabetes overview: Diagnosis. Diabetes and prediabetes tests. Updated April Cushing's syndrome. Updated May Am J Obstet Gynecol. Impaired glucose tolerance in acute pancreatitis. World J Gastroenterol. Hyperglycemia in septic patients: an essential stress survival response in all, a robust marker for risk stratification in some, to be messed with in none.
J Thorac Dis. Ishihara M. To learn more about Healthwise, visit Healthwise. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated. Skip Navigation. Top of the page. Test Overview A blood glucose test measures the amount of a type of sugar, called glucose, in your blood. Fasting blood sugar FBS measures blood glucose after you have not eaten for at least 8 hours.
It is often the first test done to check for prediabetes and diabetes. Random blood sugar RBS measures blood glucose regardless of when you last ate. Several random measurements may be taken throughout the day. Random testing is useful because glucose levels in healthy people do not vary widely throughout the day. Blood glucose levels that vary widely may mean a problem. This test is also called a casual blood glucose test.
A 2-hour postprandial blood sugar test measures blood sugar exactly 2 hours after you start eating a meal. This test is most often done at home when you have diabetes. It can see if you are taking the right amount of insulin with meals.
The hemoglobin A1c test and the oral glucose tolerance test OGTT are other tests used to look at blood sugar levels. The A1c test can be used to estimate your average blood sugar level over the past 2 to 3 months. The OGTT is commonly used to diagnose diabetes that occurs during pregnancy gestational diabetes.
Monitor treatment of diabetes. Check for diabetes that occurs during pregnancy gestational diabetes. Determine if an abnormally low blood sugar level hypoglycemia is present. A test to measure blood levels of insulin and a protein called C-peptide may be done along with a blood glucose test to determine the cause of hypoglycemia. How To Prepare Fasting blood sugar FBS For a fasting blood sugar test, do not eat or drink anything other than water for at least 8 hours before the blood sample is taken.
Random blood sugar RBS No special preparation is needed before having a random blood sugar test. How It Is Done A health professional uses a needle to take a blood sample, usually from an arm. If your test results show you have type 1, type 2, or gestational diabetes, talk with your doctor or nurse about a detailed treatment plan—including diabetes self-management education and support services —and specific steps you can take to be your healthiest.
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