What Is Considered Fasting for Blood Work? Fasting for blood work means you don't eat or drink anything but water for 8-12 hours before you have a blood test. You also need to avoid chewing gum ...
If you're worried that morning fasting will interfere with your cup of coffee, we have good and bad news. "You can have coffee," says Sue Ryskamp, senior dietitian at Michigan Medicine's Frankel ...