Fasting means abstaining from all food and drink except water for at least 8 hours (preferably 10 to 12 hours) before the test. That is, no coffee or tea beforehand, but taking vitamins or medicines is acceptable. Brushing your teeth or using mouthwash will not affect the test.
Can you brush your teeth before a fasting blood test?
Fasting means abstaining from all food and drink except water for at least 8 hours (preferably 10 to 12 hours) before the test. That is, no coffee or tea beforehand, but taking vitamins or medicines is acceptable. Brushing your teeth or using mouthwash will not affect the test.
What not to do before a fasting blood test?
For some blood tests, you may be asked to fast up to eight hours before your appointment. Fasting before a blood test means not eating or drinking anything but water. Don’t wait until the day of your blood test to ask if you should fast. This may result in your appointment being postponed.
Can you chew gum before a fasting blood test?
Chewing gum, even sugar-free gum, should be avoided on an empty stomach for a blood test. This is because it can speed up digestion, which can affect results.
What are the requirements for a fasting blood test?
Fasting means not eating or drinking anything other than water, typically 8-12 hours in advance. So if your appointment is at 8am and you are told to fast for 8 hours, only water is acceptable after midnight. If this is a 12-hour fast, avoid eating and drinking after 8 p.m. the night before.