DO NOT eat or drink anything except WATER for at least 8 hours before the test. You may drink plain water ONLY. Do NOT drink coffee, tea, soda (regular or diet) or any other beverages. Do NOT smoke, chew gum (regular or sugar-free) or exercise.
Can you drink water while fasting for a blood glucose test?
If your health care provider has told you to fast before a blood test, it means you should not eat or drink anything, except water, for several hours before your test. When you eat and drink normally, those foods and beverages are absorbed into your bloodstream.
Should you drink water before a fasting blood test?
Fasting before a blood draw means you don’t eat or drink anything except water. Don’t wait until the day of your blood draw to ask if you should fast. That could cause your appointment to be rescheduled. If at any point you’re unsure if fasting is required, contact your doctor.
How much water should you drink before a blood test?
If your phlebotomy specialist says it is OK to drink water before getting blood drawn, try to drink the recommended daily amount of water, which is 64 ounces. Before you donate, drink a glass of water that’s about 16 ounces. Although getting your blood drawn can be stressful, it doesn’t have to be.
Can you brush your teeth before a fasting blood test?
Fasting means that, with the exception of water, you refrain from eating or drinking for a minimum of 8 hours (10 to 12 hours is preferable) prior to the test. This means no coffee or tea beforehand, but taking your vitamins or medications is okay. Brushing your teeth or using mouthwash won’t influence the test.
Can you brush your teeth before a glucose test?
Yes, brushing your teeth is permitted unless otherwise indicated by your physician, assuming you do not use large amounts of toothpaste and swallow the lather.
What happens if I fast longer than 12 hours before blood test?
Many other fasting patients attend early, so you may experience some delays. Unfortunately it’s not possible to make appointments. IF YOU FAST LONGER THAN 16 HOURS – YOUR RESULTS MAY NOT BE ACCURATE, OR WE MAY NOT BE ABLE TO PERFORM SOME OF THE TESTS.
What happens if you don’t fast before blood work?
What happens if I don’t fast before a blood test? If you don’t fast before a test that requires it, the results may not be accurate. If you forget and eat or drink something, call your doctor or lab and ask if the test can still be done. They can then tell you if you need to reschedule your test.
What should I not eat the night before my glucose test?
Avoid fried foods, no bread, soft drinks with sugar or sweet tea. 1 1/2 – 2 hours after eating, drink the entire 59 gram glucola drink. Be at the office 30 minutes after finishing the cola. This is to insure that you are at the clinic on time for your blood work which will be drawn 1 hour after drinking the cola.
How long should you wait between blood tests?
If the maximum amount of blood is drawn on one occasion, we recommend waiting about 3 weeks between blood draws to reduce the risk of anemia or other abnormalities. For experiments that do not require the suggested maximum blood draw, blood can safely be drawn more frequently.
Can you drink lemon water while fasting?
Lemon juice can be acidic and drinking large quantities can potentially impact the enamel of the teeth, but as long as you’re diluting it in water, there’s usually no harm in flavoring some of your water with a splash of lemon juice while fasting or otherwise.
How does dehydration affect blood tests?
Effect of dehydration on CBG measurements
Hypotension as a result of dehydration results in decrease in perfusion and increase in glucose utilisation in the local tissue leading to false low results of capillary blood glucose (CBG) tests.
How do you pass a fasting glucose test?
For a fasting blood glucose test, you can’t eat or drink anything but water for eight hours before your test. You may want to schedule a fasting glucose test first thing in the morning so you don’t have to fast during the day. You may eat and drink before a random glucose test.
Does drinking water before blood test affect results?
Water: It is important to keep drinking plenty of water when fasting to stay hydrated. Water does not affect the results of a blood test and is acceptable to drink when asked to fast.
Can you drink coffee before blood sugar test?
You can only drink plain water so do not drink coffee, tea, or anything else before a fasting blood test, even if it is diet/unsweetened.