- Can I eat and drink before having a blood test?
- Is it a bad idea to drink coffee/tea before an exam?
- You Docs: Why you shouldn't drink green tea 24 hours before a blood test
- Everything You Need to Know About Fasting Before a Blood Test
Can I eat and drink before having a blood test?
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Why do my doctors tell me not to drink green tea 24 hours before a blood test or three days before surgery? How is it harmful? Some of the very properties that make green tea so great for you have the potential to mess with your blood tests and operations. Green tea can prevent blood clotting, much like aspirin does which is why you need to tell your doctor if you drink it. The real reason not to drink it before blood tests is the same reason docs don't want you to eat anything before blood tests: Like food, the green brew can alter your blood sugar levels in ways that could throw off the results of a diabetes test. If you drink green tea with sugar in it, that also could elevate your triglyceride levels.
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. Fasting before certain blood tests is important to help make sure that your test results are accurate. The vitamins, minerals, fats, carbohydrates, and proteins that make up all food and beverages can impact blood-level readings, clouding the results of your test. Not all blood tests will require you to fast beforehand. Blood tests that you will likely need to fast for include:.
Is it a bad idea to drink coffee/tea before an exam?
You Docs: Why you shouldn't drink green tea 24 hours before a blood test
Sometimes my doctor tells me it's okay to eat before a blood test, and sometimes it isn't. Why is that? Actually, fasting affects the results of very few blood tests. For example, measurements of kidney, liver, and thyroid function, as well as blood counts, are not influenced by fasting. However, fasting is required before commonly ordered tests for glucose blood sugar and triglycerides part of the cholesterol, or lipid, panel for accurate results.
Chat or rant, adult content, spam, insulting other members, show more. Harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing, show more. Yahoo Answers. I usually don't drink coffee, but I do drink tea when I need to stay up late for school work. Tea give me the caffeine boost I need to stay awake, but I dont know if I'd need it in the morning. Thank you.
Janet Renee is a clinical dietitian with a special interest in weight management, sports dietetics, medical nutrition therapy and diet trends. She earned her Master of Science in nutrition from the University of Chicago and has contributed to health and wellness magazines, including Prevention, Self, Shape and Cooking Light. When your physician orders certain tests, you may need to fast for several hours prior to the test assure accuracy. Nutrients in the foods you eat and beverages you drink can influence test results. For some tests, even the stimulation of digestion enzymes interferes with test results. The amount of time you need to fast can vary between eight and 12 hours.
Everything You Need to Know About Fasting Before a Blood Test