Blood draws for several kinds of diagnostic tests require you to fast for several hours. Eating or drinking anything besides water can skew the results, leading to you needing to be retested. You may ...

You can consume nothing but water for at least 8 hours before a fasting glucose test. You may also need to follow a low carb diet and avoid exercise for some time before. A fasting glucose test ...

When you need a blood test that requires fasting, youll want to be aware of things that could cause faulty test results. Drinking diet soda with artificial sweetener before a fasting blood test might ...