The typical recommendation for fasting before blood work is to fast for 8 to 12 hours. During this fasting period, you should avoid all food and beverages except plain water. Your healthcare provider will give specific instructions depending on the type of blood test being done. For example, fasting is important for glucose and triglyceride tests to ensure accurate results. Additional guidelines include:
- Avoid chewing gum, smoking, and exercise during the fast.
- Do not consume tea, coffee, or any other drinks except water.
- Some tests require no more than 16 hours of fasting.
- Take any prescribed medications unless otherwise instructed.
Scheduling the blood test early in the morning is recommended so most fasting time occurs during sleep, making it easier to maintain the fast. In summary, fasting for 8 to 12 hours before blood work is standard, but follow specific instructions from your healthcare provider for the best results.
