Follow your doctor’s instructions exactly
Ask whether you need to fast before the test
Eat normally in the days before the test unless told otherwise
Avoid unusually high-sugar meals right before the test
Drink water unless you are told not to
Bring a snack or meal for after the test if fasting is required
Wear comfortable clothing
Arrive on time for your appointment
Tell your doctor about any medications or supplements you take
Ask if you should avoid caffeine before the test
Rest as much as possible before the appointment
Let the staff know if you feel unwell on the day of the test