For four (4) weeks before your test:
You should not take any antibiotics.
For one (1) week before your test:
Do not take any laxatives or stool softeners (for example Colace, Milk of Magnesia, Ex-Lax) or stool bulking agents (for example Metamucil or Citrucel). You should also not undergo any test that requires cleansing of the bowel, such as colonoscopy or barium enema.
The day before your test:
You may consume only the following foods and drinks: plain white bread, plain white rice, plain white potatoes, baked or broiled chicken or fish, water, non-flavoured black coffee or tea. Only salt may be used to flavour your food. Butter or margarine is not permitted. Fizzy drinks such as lemonade or cola are not permitted.
DO NOT EAT OR DRINK ANYTHING ELSE
Eating prohibited foods could give false results for the test. Specifically, avoid beans, pasta, fibre cereals and high fibre foods.
The night before the test: have an early dinner of rice and meat.
For 12 hours before your test:
Apart from small amounts of water, you must stop eating and drinking 12 hours before the test. For example, if your test is at 9:00 a.m., you would stop eating and drinking at 9:00 pm the night before (see your appointment letter for precise timings). You may continue to take your usual prescription medicines (only those not on the prohibited list) with water until 12 hours before the test. Take only essential medications the morning of your test. Please bring all prescription medications to your appointment. If in doubt, please call us.
The day of your test:
Apart from small amounts of water, you should not eat or drink anything in the morning. You may take your medications with a small amount of water. If you are diabetic requiring insulin or diabetic pills, ask your GP if you should change your morning dose. Generally, half of your normal long acting insulin is given. Oral hypoglycaemic medications are usually not taken that morning until completion of the test and resumption of eating meals. If in doubt please check with your referring Consultant. The morning of your test, please brush your teeth but be careful not to swallow the toothpaste.
DO NOT EAT, DRINK, CHEW GUM, SMOKE CIGARETTES, EAT BREATH MINTS OR OTHER SWEETS BEFORE OR DURING THE TEST.
Do not sleep or exercise while the test is being done. Your test may last for two to four hours. Please allow yourself sufficient time to complete your test.