There is no single best fasting start time
Your appointment time, prep product, health conditions, and sedation plan determine the schedule. Get clock times from your clinic for stopping solid food, taking each dose, stopping clear liquids, and arriving. Do not copy another person’s timetable or start an extra-long fast on your own.
Put these times on one page
- When do I switch to a low-fibre diet, if instructed?
- When is my last permitted solid food?
- When do I start and finish each prep dose?
- When must I stop all clear liquids?
- When do I arrive, and when should my escort be available?
The solid-food cutoff and the clear-liquid cutoff are different instructions. Clarify both before prep day.
The last meals before the solid-food cutoff
Many clinics advise a low-fibre diet for a few days. Common foods to avoid during that period include nuts, seeds, corn, whole grains, and raw fruits and vegetables. Use your clinic’s own permitted-food list. If you are still allowed solids, choose a simple meal from that list rather than a large, high-fibre “last meal.”
Some protocols allow a low-residue meal during part of the preceding day; others require clear liquids for the whole day. Once your instructions say clear liquids only, solid foods are no longer allowed.
What “clear liquids” means
Common examples include water, clear broth, apple juice without pulp, and tea or coffee without milk or cream, if allowed by your clinic. Smoothies, milk, and drinks containing pulp are not clear liquids. Follow the unit’s colour restrictions, commonly including red and purple. Diabetes or fluid restrictions may require a different plan.
Keep drinking the permitted fluids according to your instructions until the clinic’s cutoff. Do not assume stopping solid food means stopping all fluids immediately.
Taking the prescribed preparation
Many regimens divide the preparation into doses, often with a later dose closer to the procedure. The exact amount, accompanying fluid, and timing are product-specific. Follow the full prescribed course; do not substitute a different laxative or add extra doses without advice.
Is finishing 75% enough?
There is no universal “75% is enough” rule, including for the last dose. Incomplete prep can leave parts of the bowel difficult to examine and may lead to a repeat procedure. Clear-looking output alone is not permission to stop early.
If nausea, vomiting, or another problem makes finishing difficult, call the endoscopy team or its after-hours service. Tell them the product, how much you took, when you took it, your symptoms, and the scheduled procedure time. They can give instructions appropriate to your situation. Do not improvise around the fasting cutoff.
A little practical comfort
- Stay near a bathroom once the preparation starts working.
- Keep instructions, the clinic number, and a charged phone close by.
- Wear loose, comfortable clothing and allow yourself a quiet evening.
- Ask whether chilling the solution, a permitted flavouring, or a straw is appropriate for your specific product; do not mix in unapproved ingredients.
- Ask about suitable skin-care products if repeated wiping becomes uncomfortable.
If something feels wrong
Contact your team promptly if you cannot keep liquids down, have severe abdominal pain, or feel faint or markedly unwell. Tell them if the preparation is not producing the expected bowel movements. Do not wait until arrival to disclose an incomplete prep.
Comfort products are optional; MyRear does not sell a universal prep kit or rank bowel-cleansing medicines.
This is general education for U.S. readers, not a diagnosis or a personal screening plan. Talk with your clinician about your own history and symptoms. Follow your clinic’s instructions.