The triglyceride level test is a blood test that helps measure the amount of triglycerides in your blood. 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. For other tests or operations, you need to fast for safety reasons.
Your doctor can tell you what to do to prepare for your test. Fasting means not eating and only drinking sips of water. If you are fasting, you can't drink fruit juice, soft drink, coffee, tea or milk, and you can't eat or suck on lollies and chewing gum.
A fasting blood test is usually done in the morning after you have fasted for 8 to 16 hours. You must have nothing to eat or drink including water for 6 hours before a gastroscopy. This is to lower the risk of vomiting up and inhaling what's in your stomach. It also gives the doctor a clear view inside the stomach and intestine. Before a colonoscopy , you eat a low-fibre diet for 1 to 2 days, and have only clear fluids the day before, such as water, black coffee, apple juice, or clear jellies.
If you have diabetes , make sure you get the right amount of glucose in these fluids. The day before, you also take a bowel preparation medication to empty your bowel. Finally, you need to fast for several hours before the procedure.
If you are being sedated or having a general anaesthetic , your doctor will ask you to stop eating several hours beforehand. You can have small amounts of clear fluids up to 2 hours before. Keep taking your medication as usual before a test, unless your doctor instructs you otherwise. Some medications need to be stopped, so be sure to tell your doctor everything you are taking.
Contact your doctor if you have concerns about your blood sugar levels, staying well while fasting, or if you have to break your fast. Learn more here about the development and quality assurance of healthdirect content.
A colonoscopy is a diagnostic test to look inside your large bowel. Be sure to stay hydrated before your test by drinking the recommended amount of water for your weight and activity level. Any beverage other than water should not be consumed before a blood test, unless approved by your healthcare provider.
Alcohol, soda, and juice contain high quantities of sugar, which can interfere with many common test results. Black coffee, tea, and other caffeinated beverages are diuretics, which can have a dehydrating effect and cause test results to be inaccurate.
For best results, avoid drinking all non-water beverages for the recommended amount of time before your test. If you have been instructed to fast before your blood test and you accidentally eat or drink something during the fasting window, it is important to notify your healthcare provider or the person drawing your blood.
It may be possible for your healthcare provider to interpret the non-fasted test results. Why do I need to fast before my blood test? What types of blood tests require fasting? The most common types of tests that require fasting include: Glucose tests , which measure blood sugar. One type of glucose test is called a glucose tolerance test. For this test you will need to fast for 8 hours before test.
When you arrive at the lab or health care facility, you will: Have your blood tested Drink a special liquid containing glucose Have your blood re-tested one hour later, two hours later and possibly three hours later Glucose tests are used to diagnose diabetes. Lipid tests , which measure triglycerides , a type of fat found in the bloodstream, and cholesterol , waxy, fat-like substance found in your blood and every cell of your body.
How long do I have to fast before the test? Can I drink anything besides water during a fast? In addition, you should not : Chew gum Smoke Exercise These activities can also affect your results. Can I continue taking medicine during a fast?
What if I make a mistake and have something to eat or drink besides water during my fast?
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