The hours you spend sleeping are considered part of the fasting period, as long as you don’t break your fast with coffee or food once you’re awake. Our website services, content, and products are for informational purposes only. They should make a note so that the results are reviewed with the food intake as a variable. Your cholesterol can be tested without fasting. For this reason it as actually a good idea to drink water before your fasting blood test. You should not eat food, drink coffee or take some medications for eight to 12 hours before a fasting blood test, but most physicians agree that you can drink water. You don't need to fast before all blood tests. Your doctor may ask you to take a fasting blood test to determine your cholesterol or blood sugar levels. © 2005 - 2019 WebMD LLC. Devra Gartenstein is an omnivore who has published several vegan cookbooks. A complete cholesterol test finds the amount of “good” and “bad” cholesterol and the level of triglycerides in your blood. ", Nemours Foundation: "Blood Test: Comprehensive Metabolic Panel (CMP). Take your prescription medications unless your doctor tells you to skip them. For instance, if you eat or drink before a fasting blood glucose test, your blood sugar probably will be higher than if you hadn't had anything. What happens if you don’t fast before a blood test? Tap or bottled water are both OK, but leave the squeeze of lemon for another time. There are a variety of tests that can diagnose…. This can make the blood test harder or more stressful for you. That’s because it contains caffeine and soluble plant matter, which might skew your test results. Iron Blood Test: You will have to come to the lab in the morning to take this blood test. For the best results, they may ask you to reschedule. Get Tips to Avoid Health Problems. If you forget and eat or drink something, call your provider and ask if the test can still be done. Some blood tests will require you to fast beforehand. In these cases, your doctor will instruct you not to eat or drink anything, except water, in the hours leading up to the test. You might want to bring a snack and a drink with you so you can eat as soon as possible after the test. Fasting is usually safe if you’re pregnant, provided you’re in good health and aren’t having a high-risk pregnancy. Here’s what you need to know about the test. Coffee is also a diuretic, which means that it will increase how much you pee. Can you drink alcohol if you’re fasting before a blood test? Triglycerides are a type of fat. Fasting Blood Glucose Test: You should not eat or drink anything for at least 8-10 hours before having this test. Low-density lipoprotein (LPD) is a type of cholesterol. For your overall comfort, your doctor may advise you to drink extra water or to remain indoors, especially if the weather is very hot or humid. There are several blood tests you may need if you’re pregnant. If you make a mistake and eat or drink anything besides water, tell the person taking your blood. But ask your doctor before you take any over-the-counter drugs. Are Nonfasting Triglyceride Levels More Accurate Than Fasting Triglyceride Levels? Seltzer and club soda are off-limits. Drinking water makes your veins plump and easy to access. That’s because it contains caffeine and soluble plant matter, which might skew your test results. You also shouldn't smoke, chew gum (even sugarless), or exercise. Also ask your doctor if you can smoke cigarettes before the test, or if you should refrain from smoking during your fast. high-density lipoprotein (HDL) level test. Fasting before certain blood tests is important to help make sure that your test results are accurate. Also try drinking several glasses of water right before the blood draw to make it easier for the nurse or other medical professional to find a vein. Trace amounts of alcohol can remain in your bloodstream for several days. The test helps diagnose diabetes. Q&A: What happens if you don’t fast before a blood test? Schedule your test as early in the day as possible. You can get an HDL test to find out the level of good cholesterol in your blood. Dehydration can also affect your triglyceride count, which is one part of the lipid panel that doctors test along with your cholesterol by means of a fasting lab. Your doctor will tell you if you need to. American Academy for Clinical Chemistry: "Basic Metabolic Panel," "Comprehensive Metabolic Panel," "GGT," "Glucose Tests," "Iron Tests," "Lipid Profile," "Renal Function Panel," "Vitamin B12 & Folate. Fasting means you don't eat or drink anything but water usually for 8 to 12 hours beforehand. Red meats, broccoli, and even some medications may cause a false positive test. Fasting may increase heartburn in some pregnant women. She has owned and run small food businesses for 30 years. Even if you drink it black, coffee can interfere with blood test results. The triglyceride level test is a blood test that helps measure the amount of triglycerides in your blood. How Long Does Coronavirus Live On Surfaces? So, if your appointment is at 8 a.m. and you're told to fast for 8 hours, only water is okay after midnight. But your stomach is growling and you have serious caffeine withdrawal hours before you roll up your sleeve. The process of fasting ensures that the results of your blood test will not be confused by foods that you have eaten during the last few hours that your body has not fully absorbed.
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