how long to fast before blood draw

The typical recommendation is to fast for at least 8 to 12 hours before a blood draw. This means not eating or drinking anything except plain water during that time. The exact fasting duration depends on the specific blood test being done, and a doctor will provide precise instructions. Drinking water is allowed and even encouraged, but avoid all other foods, drinks, smoking, chewing gum, and exercise before the test. Many people schedule their blood draws in the morning so that most of the fasting time occurs overnight while sleeping. Some common tests requiring fasting include blood glucose, lipid panel, liver function, and iron levels. If unsure, always check with your healthcare provider for the specific fasting requirement. After the blood is drawn, the fast is over, and you can eat normally again.