Will I need to do anything to prepare for the test?
You will need to fast (not eat or drink) for eight hours before the test. Children younger than 9 years old should fast for four hours before the test.
For 24 hours before the test, you will need to not eat foods high in a type of sugar known as pentose, which is similar to xylose. These foods include jams, pastries, and fruits. Your provider will let you know if you need to take any other preparations.
