You may feel a little sting when the needle goes in or out. For some types of glucose blood tests, you will need to drink a sugary drink before your blood is drawn. If you have diabetes, your health care provider may recommend a kit to monitor your blood sugar at home. Most kits include a device to prick your finger lancet.
You will use this to collect a drop of blood for testing. For more information on at-home test kits, talk to your health care provider. You will probably need to fast not eat or drink for eight hours before the test.
If you are pregnant and are being checked for gestational diabetes:. There is very little risk to having a blood test. You may have slight pain or bruising at the spot where the needle was put in, but most symptoms go away quickly. If your results show higher than normal glucose levels, it may mean you have or are at risk for getting diabetes. High glucose levels may also be a sign of:. If your glucose results are not normal, it doesn't necessarily mean you have a medical condition needing treatment.
High stress and certain medicines can affect glucose levels. To learn what your results mean, talk to your health care provider. Learn more about laboratory tests, reference ranges, and understanding results. Many people with diabetes need to check blood glucose levels every day. If you have diabetes, be sure to talk to your health care provider about the best ways to manage your disease.
The information on this site should not be used as a substitute for professional medical care or advice. Contact a health care provider if you have questions about your health. Blood Glucose Test. As mentioned by the NIH , a doctor may recommend an A1C test if a person shows signs of poor glucose control, diabetes, or prediabetes. Warning signs can include :.
Doctors may also recommend an A1C test for people who have the following risk factors for prediabetes :. Most people can take an A1C test at any time without preparing beforehand. However, a doctor may sometimes request that a person avoids eating or drinking for 8 hours before the test. Women who are pregnant may need to drink a sugary beverage 1 hour before the test. A doctor or nurse will collect a blood sample, usually from a vein in the arm or hand.
They will send the sample to a laboratory for analysis. These tests carry a low risk of complications. However, people may experience temporary pain or bruising at the injection site. Using an unclean needle or lancet can lead to an infection. Doctors can also prescribe insulin and other medication that help stabilize blood sugar levels. Learn more about low-glycemic foods here.
People can lower high blood sugar by:. Type 1 and type 2 diabetes can affect how the body produces and responds to insulin. When insulin is only available in smaller quantities, or cells no longer respond to it, sugar does not enter these cells and remains in the blood.
Type 1 diabetes: The beta cells that make insulin in the pancreas are damaged or destroyed, so sugar stays in the blood for longer.
Type 2 diabetes: The cells in the liver, muscles, and fat tissue no longer respond to insulin, and they release more sugar into the blood. The beta cells not producing enough insulin compounds in this situation. People who have diabetes can experience high blood sugar levels, or hyperglycemia, because the cells in their body cannot absorb sugar from the blood.
If people take too much insulin, exercise more than usual, or skip a meal, they may experience low blood sugar levels, or hypoglycemia. Regularly monitoring blood sugar levels is a vital aspect of diabetes treatment. Uncontrolled blood sugar levels can lead to long-term health conditions, including vision loss, heart disease, and kidney disease. Read the article in Spanish. Advertising revenue supports our not-for-profit mission. This content does not have an English version. This content does not have an Arabic version.
Sections for Glucose tolerance test About. Overview The glucose tolerance test, also known as the oral glucose tolerance test, measures your body's response to sugar glucose. Request an Appointment at Mayo Clinic. Share on: Facebook Twitter. Show references Glucose tests. Lab Tests Online.
Accessed Jan. Gestational diabetes. Mayo Clinic. American Diabetes Association. Standards of medical care in diabetes — Diabetes Care. Masharani U. Diabetes mellitus and hypoglycemia.
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