What does it mean to be “fasting” for a blood draw? It may not mean what you think…

By on October 28, 2011 under Uncategorized

Most people think fasting means nothing to eat or drink after going to bed the night before a blood draw. Most patients make the mistake of avoiding anything by mouth, including water and medications. Fasting technically means nothing to eat or drink EXCEPT water and medications for 8-12 hours prior to a blood draw.

The reason for fasting is because of 2 tests – blood glucose (sugar) and the cholesterol panel. The only foods that will affect this are sugar or fat. Black coffee, plain tea, or other non-caloric beverages will not affect the results. Hydration with water actually helps make the veins more pronounced , maybe for an easier blood draw. Medications should NEVER be skipped for a fasting blood draw.