For most blood tests that require fasting, the typical fasting period is 8 to 12 hours before the blood draw. During this time, you should not eat or drink anything except plain water. The exact duration depends on the specific blood test your healthcare provider has ordered, so it is important to follow their instructions closely. Common tests requiring fasting include glucose (blood sugar), triglycerides (part of cholesterol testing), and some iron level tests. You should also avoid smoking, chewing gum, and exercising during this fasting period, as these can affect test results. Water is allowed and encouraged to stay hydrated. Scheduling blood tests early in the morning can help make the fasting period easier by aligning most of it with sleep time.
Not all blood tests require fasting, so confirm with the healthcare provider whether fasting is needed for your specific blood work.
