Follow your doctor’s instructions exactly before the test
Fast for the required time, usually 8 to 12 hours
Drink only water during the fasting period unless told otherwise
Avoid smoking, vaping, chewing gum, and exercise before and during the test
Eat your usual diet for several days before the test unless instructed differently
Do not start a low-carb or high-sugar diet right before the test
Take only medications approved by your doctor before the test
Tell your doctor about all medications, supplements, and vitamins you use
Arrive on time and stay seated or resting during the test
Drink the glucose solution exactly as instructed and finish it quickly
Do not eat or drink anything except water during the test unless allowed
Do not leave the testing area unless the staff says it is okay
Stay calm and avoid stress as much as possible before the test
Get a good night’s sleep before the test
Schedule the test for a time when you are feeling well
Ask your doctor if any recent illness, vomiting, or infection could affect the result
Ask your doctor whether you should reschedule if you cannot follow the prep instructions
If you feel unwell during the test, tell the staff immediately