Fbs how many hours

Triglycerides are a type of fat. Nonfasting triglyceride levels provide an important snapshot of your health. Learn how they're used and how they differ from fasting triglyceride…. You can get an HDL test to find out the level of good cholesterol in your blood. Low-density lipoprotein LPD is a type of cholesterol.

Health Conditions Discover Plan Connect. Medically reviewed by Deborah Weatherspoon, Ph. How long should you fast before a blood test? Is it OK to drink water before a blood test? What if your child needs to fast before a blood test? What about fasting for a blood test during pregnancy? Read this next. Blood Glucose Test. Medically reviewed by Maria S. Prelipcean, MD. Basic Metabolic Panel. Medically reviewed by University of Illinois.

Diabetes Tests. Medically reviewed by Maria Prelipcean, M. Glucose comes from carbohydrate foods. It is the main source of energy used by the body. Insulin is a hormone that helps your body's cells use the glucose. Insulin is produced in the pancreas and released into the blood when the amount of glucose in the blood rises. Normally, your blood glucose levels increase slightly after you eat. This increase causes your pancreas to release insulin so that your blood glucose levels do not get too high.

Blood glucose levels that remain high over time can damage your eyes, kidneys, nerves, and blood vessels. 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. If you have diabetes, you may be asked to wait until you have had your blood tested before you take your morning dose of insulin or diabetes medicine.

There is very little chance of having a problem from this test. A small bruise may form at the site. Results are often ready in 1 to 2 hours. Glucose levels in a blood sample taken from your vein called a blood plasma value may differ a little from glucose levels checked with a finger stick. Each lab has a different range for what's normal.

Your lab report should show the range that your lab uses for each test. The normal range is just a guide. Your doctor will also look at your results based on your age, health, and other factors. A value that isn't in the normal range may still be normal for you. You may have diabetes. To make a diagnosis of type 2 diabetes, your doctor will use the American Diabetes Association's criteria. Author: Healthwise Staff.

Medical Review: E. This information does not replace the advice of a doctor. Healthwise, Incorporated, disclaims any warranty or liability for your use of this information. To learn more about how to prepare for this test, see the topic Oral Glucose Tolerance Test. Talk to your doctor about any concerns you have regarding the need for the test, its risks, how it will be done, or what the results may mean.

To help you understand the importance of this test, fill out the medical test information form. The health professional taking a sample of your blood will:. The blood sample is taken from a vein in your arm. An elastic band is wrapped around your upper arm.

It may feel tight. You may feel nothing at all from the needle, or you may feel a quick sting or pinch. There is very little risk of a problem from having blood drawn from a vein. Results are often ready in 1 to 2 hours.

Glucose levels in a blood sample taken from your vein called a blood plasma value may differ a little from glucose levels checked with a finger stick. Each lab has a different range for what's normal. Your lab report should show the range that your lab uses for each test. The normal range is just a guide. Your doctor will also look at your results based on your age, health, and other factors.

A value that isn't in the normal range may still be normal for you. Many conditions can change your blood glucose levels. Your doctor will discuss any significant abnormal results with you in relation to your symptoms and past health. You may have diabetes. Your doctor will make a diagnosis of type 2 diabetes based on a physical examination and the results of blood tests and any symptoms you may have.

Other conditions that can cause high blood glucose levels include:. A fasting glucose level below 2. Reasons you may not be able to have the test or why the results may not be helpful include:. Author: Healthwise Staff. Medical Review: E. This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use and Privacy Policy.

Learn how we develop our content. To learn more about Healthwise, visit Healthwise. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.

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.

This is not a test used to diagnose diabetes. Random blood sugar RBS measures blood glucose regardless of when you last ate. Several random measurements may be taken throughout the day.