Jason: Why do you have to be fasted when you get blood work done?
Megan: Usually 8-12 hours before getting blood tests you are asked to fast because drinks and food can give incorrect results. This is because they contain nutrients, vitamins, and substances that could get into your bloodstream. Fasting gives more accurate results. Typically blood work being done to check your thyroid, liver function, lipid profile, renal, iron, and glucose are all asked to be done when fasted. I always try to schedule blood work first thing in the morning so that the fast can be during sleep. It’s an important step to getting the best results so that you can better address your health.