The child must be fasting for at least 12 hours for the blood draw.

We recommend scheduling a blood draw first thing in the morning before breakfast. This is the most important preparation you can make for the test. Our scientists are searching for differences in the underlying metabolism of your child, so it’s critical that the child’s blood is drawn after a minimum 12 hours without anything other than water to drink. The child can and should stay properly hydrated for the test, though, so make sure he or she has been drinking plenty of water.

For the simplest experience and fastest results, make sure the child hasn’t had anything to eat or drink except water for at least 12 hours before the blood draw. We won’t be able to analyze blood of a child who hasn’t fasted.

• Bring the child’s favorite snack or treat to eat as soon as the blood draw is completed.
• Make plans to go out for breakfast after the appointment.
• Allow the child to participate in a chosen activity after the blood draw.