What blood work do you need to fast for?

Fasting is typically required for blood work that measures glucose levels, such as a fasting blood glucose test or an oral glucose tolerance test, as well as lipid panel tests that assess cholesterol and triglycerides. Fasting usually means no food or drink (except water) for 8-12 hours prior to the test. It's important to follow your healthcare provider's specific instructions regarding fasting for any blood work. Always consult with your doctor if you have questions about preparation for lab tests.