
Discontinue nutritional supplements for at least 72 hours prior to blood draw, especially those containing biotin (B7). (Including beef liver).
**Probiotics, enzymes and herbs are okay to continue.
Be fasted for 12 hours overnight. Avoid all substances except for plain water. No food, electrolytes, coffee, or substances with caloric value.
Do NOT avoid prescription medications unless advised directly by your healthcare team.
Aim to drink 60-80 ounces or water per day, and a glass of water the morning of your lab draw.
As best as possible, blood draws should be done in the morning between 7 - 10 am.