Oral Glucose Tolerance Test Uses, Procedure and Results
Jan 21, †Ј If you have diabetes, self-testing your blood sugar (blood glucose) can be an important tool in managing your diabetes and preventing complications. You can test your blood sugar at home with a portable electronic device called a blood sugar meter using a small drop of your blood. You can also use a device called a continuous glucose monitor (CGM). A blood glucose test is a blood test that screens for diabetes by measuring the level of glucose (sugar) in a personТs blood. Normal blood glucose level (while fasting) range within 70 to 99 mg/dL ( to mmol/L). Higher ranges could indicate pre-diabetes or diabetes.
A blood glucose test measures the glucose levels in your blood. Glucose is a type of sugar. It is your body's main source of energy.
A hormone called insulin helps move glucose from your bloodstream into your cells. Too much or too little glucose in the blood can be a sign of a serious medical condition. High blood glucose levels hyperglycemia may be a sign of diabetesa disorder that can cause heart diseaseblindnesskidney failure and other complications.
Low blood glucose levels hypoglycemia can also lead to major health problems, including brain damage, if not treated. A blood glucose test is used to find out if your blood sugar levels are in the healthy range. It is often purple sofa what colour walls to help diagnose and monitor diabetes.
Your health care provider may order a blood glucose test if you have symptoms of high glucose levels hyperglycemia or low glucose levels hypoglycemia. You may also need a blood glucose test if you have certain risk factors for diabetes. These include:.
If you are pregnant, you will likely get a blood glucose test between the 24th and 28th week of your pregnancy to check for gestational diabetes. Gestational diabetes is a form of diabetes that happens only during pregnancy. A health care professional will take how to search on instagram pc blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial.
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 what happens when large files are zipped. 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 medical information provided is for informational purposes only, and is not to be used as a substitute for professional medical advice, diagnosis or treatment.
Please contact your health care provider with questions you may have regarding medical conditions or the interpretation of test results. Blood Glucose Test. What is a blood glucose test? What is it used for? Why do I need a blood glucose test? Symptoms of high blood glucose levels include: Increased thirst More frequent urination Blurred vision Fatigue Wounds that are slow to heal Symptoms of low blood glucose levels include: Anxiety Sweating Trembling Hunger Confusion You may also need a blood glucose test if you have certain risk factors for diabetes.
These include: Being overweight Lack of exercise Family member with diabetes High blood pressure Heart disease If you are pregnant, you will likely get a blood glucose test between the 24th and 28th week of your pregnancy to check for gestational diabetes. What happens during a blood glucose test? Will I need to do anything to prepare for the test? If you are pregnant and are being checked for gestational diabetes: You will drink a sugary liquid one hour before your blood is drawn.
You won't need to fast for this test. If your results show higher than normal blood glucose levels, you may need another test, which requires fasting. Talk to your health provider about specific preparations needed for your glucose test. Are there any risks to the test? What do the results mean? High glucose levels may also be a sign of: Kidney disease Hyperthyroidism Pancreatitis Pancreatic cancer If your results show lower than normal glucose levels, it may be a sign of: Hypothyroidism Too much insulin or other diabetes medicine Liver disease If your glucose results are not normal, it doesn't necessarily mean you have a medical condition needing treatment.
Is there anything else I should know about a blood glucose test? References American Diabetes Association [Internet]. Checking Your Blood Glucose [cited Jul 21]; [about 4 screens]. Gestational Diabetes [cited Jul 21]; [about 3 screens]. Glucose Tolerance Test [updated Sep 2; cited Jul 21]; [about 4 screens]. Atlanta: U. Glucose Monitoring; p. Lab Tests Online [Internet]. American Association for Clinical Chemistry; cЧ Diabetes Mellitus DM [cited Jul 21]; [about 2 screens].
Hypoglycemia Low Blood Sugar [cited Jul 21]; [about 2 screens]. Bethesda MD : U. Medical Tests: Glucose Test [cited Jul 21]; [about 5 screens]. Health Encyclopedia: Glucose Blood [cited Jul 21]; [about 2 screens]. In the event of a medical emergency, call immediately.
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A blood glucose test is used to find out if your blood sugar levels are in the healthy range. It is often used to help diagnose and monitor diabetes. Why do I need a blood glucose test? Your health care provider may order a blood glucose test if you have symptoms of high glucose levels (hyperglycemia) or low glucose levels (hypoglycemia). Jul 02, †Ј A blood glucose test measures the amount of glucose in your blood. Glucose, a type of simple sugar, is your bodyТs main source of energy. . Jun 29, †Ј Blood sugar test People can measure their blood sugar levels with either a blood sugar meter or a continuous glucose monitor. A continuous glucose monitor uses a .
Blood sugar testing is an important part of diabetes care. Find out when to test your blood sugar, how to use a blood sugar meter and more. If you have diabetes, self-testing your blood sugar blood glucose can be an important tool in managing your diabetes and preventing complications.
You can test your blood sugar at home with a portable electronic device called a blood sugar meter using a small drop of your blood.
You can also use a device called a continuous glucose monitor CGM. Your doctor will let you know how often to check your blood sugar levels. The frequency of testing usually depends on the type of diabetes you have and your treatment plan. Your doctor may recommend blood sugar testing four to 10 times a day if you have type 1 diabetes. You may need to test:. If you take insulin to manage type 2 diabetes, your doctor may recommend blood sugar testing several times a day, depending on the type and amount of insulin you use.
Testing is usually recommended before meals and at bedtime if you're taking multiple daily injections. You may need to test only before breakfast and dinner if you use just an intermediate- or a long-acting insulin. If you manage type 2 diabetes with noninsulin medications or with diet and exercise alone, you may not need to test your blood sugar daily.
A continuous glucose monitor CGM is a device that measures your blood sugar every few minutes using a sensor inserted under the skin. People with diabetes, particularly those with type 1 diabetes, may also choose to use CGMs.
These devices measure your blood sugar every few minutes using a sensor inserted under the skin. These sensors are typically worn for a week or two before they need to be changed.
The newest type of continuous glucose monitor has an implanted sensor that can detect blood sugar levels for up to three months. A transmitter worn on the body sends blood sugar information wirelessly from the sensor to a smartphone app. Some devices show your blood sugar reading at all times on a receiver, smartphone or smartwatch, and an alarm goes off if your blood sugar is going up or down too quickly.
Others require that you check your blood sugar by running the receiver over the sensor periodically. Most of these devices still require finger-stick checks to calibrate the machine. Check your device's users guide to learn if you need to check, and if so, how often you need to do it. Readings on newer CGMs don't seem to be affected by standard doses of acetaminophen up to 1, milligrams for an adult.
If you need to take medications that may affect the accuracy of the readings, your doctor may recommend double-checking your CGM results with a standard blood sugar meter. Check with your doctor about using a CGM if you're pregnant, on dialysis or critically ill, as these conditions may affect the blood sugar readings from a CGM. Ask your doctor what a reasonable blood sugar range is for you. Your doctor will set target blood sugar test results based on several factors, including:.
But the ADA notes that these goals often vary depending on your age and personal health and should be individualized. For example, Mayo Clinic generally recommends that healthy adults under 60 can aim for slightly lower blood sugar targets. Blood sugar testing requires the use of a blood sugar meter.
The meter measures the amount of sugar in a small sample of blood, usually from your fingertip, that you place on a disposable test strip.
Your doctor or diabetes educator can recommend an appropriate device for you. He or she can also help you learn how to use your meter. Follow the instructions that come with your blood sugar meter. In general, here's how the process works:. Some meters can test blood taken from an alternate site, such as the forearm or palm. But these readings may not be as accurate as readings from the fingertips, especially after a meal or during exercise, when blood sugar levels change more frequently. Alternate sites aren't recommended for use in calibrating CGMs.
Talk with your doctor about how often you need to record your blood sugar results. The readings given by many devices can now be downloaded to a computer. If you manually log your results, record the date, time, test results, medication and dose, and diet and exercise information.
Bring your record of results with you to your doctor's appointments. Talk to your doctor about what steps to take if you get results that don't fall within the range of your target goals. Blood sugar meters need to be used and maintained properly. Follow these tips to ensure proper usage:.
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Products and services. Free E-newsletter Subscribe to Housecall Our general interest e-newsletter keeps you up to date on a wide variety of health topics. Sign up now. Blood sugar testing: Why, when and how Blood sugar testing is an important part of diabetes care. By Mayo Clinic Staff. Open pop-up dialog box Close. Continuous glucose monitor A continuous glucose monitor CGM is a device that measures your blood sugar every few minutes using a sensor inserted under the skin.
Show references American Diabetes Association. Glycemic targets: Standards of Medical Care in Diabetes Ч Diabetes Care. Know your blood sugar numbers: Use them to manage diabetes. Accessed Nov. Weinstock RS. Self-monitoring of glucose in management of nonpregnant adults with diabetes mellitus.
The big picture: Checking your blood glucose. American Diabetes Association. Diagnosis and management of type 2 diabetes mellitus in adults. Institute for Clinical Systems Improvement.
Eversense continuous glucose monitoring system. Senseonics, Inc. Accessed Dec. Basu A, et al. Continuous glucose monitor interference with commonly prescribed medications: A pilot study. Journal of Diabetes Science and Technology. How to safely use glucose meters and test strips for diabetes. Food and Drug Administration. Blood glucose monitoring devices. Dexcom continuous glucose monitoring system. Dexcom, Inc. Castro MR expert opinion. Mayo Clinic. See also Medication-free hypertension control A1C test After a flood, are food and medicines safe to use?
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