When in my trip should the screening day go?

Early, and not on your first morning. Early because anything the day turns up is easier to act on while you are still in the country, with a physician who can arrange a follow-up. Not the first morning because the fast and the sedation both go better without a long-haul flight immediately behind them, and because a delayed bag containing your medication is a worse problem on day one than on day three.

How long is the fast?

Several hours, and the exact window depends on which tests your program includes and what time your slot is. Your coordinator sends the specific timing once the appointment is confirmed rather than a general rule, because a general rule is either too strict for some programs or too loose for others.

Can I do anything else that day?

Plan on nothing. If your program includes an endoscopy under sedation, you should not drive, sign anything binding, or rely on your own judgement for the rest of the day. Most people underestimate this and book dinner. The screening day is the day.

What about my regular medication?

Bring it, in its original packaging, and tell your coordinator what it is before you fly rather than on the morning. Blood thinners and diabetes medication are the two classes that most often change what can happen on the day, and both are handled easily with notice and badly without it.

Guides · Preparing

Give the day
to the day.

What this page is

A process, not a measured outcome.

Nothing on this page is a figure, so nothing here is sourced or unsourced. It describes how a screening day is prepared for and what the constraints do to a travel itinerary. The exact timings are the one thing it deliberately does not state, because they depend on which tests your program includes and what time your slot is, and your coordinator sends them once the appointment is confirmed.

The night before

Two constraints that actually bind.

The fast. Every program on this site includes bloods and an ultrasound, and both want an empty stomach. The window is several hours and it is measured back from your slot rather than from midnight, so a late slot and an early slot are prepared for differently. Water is usually fine and coffee usually is not, which surprises people more than the food does.

The bowel preparation, if your program includes a colonoscopy. This is the real one. It is a clear-liquid diet and a prescribed solution taken the day before, it takes the evening, and an incomplete preparation can hide small lesions, which means a badly-prepared colonoscopy is not a slightly worse test but a partly wasted one. Programs from the Comprehensive tier up include it.

The day itself

Sedation takes the afternoon with it.

If your program includes an endoscopy, it is performed under sedation, and at partner centres a gastroscopy and a colonoscopy are commonly done back to back in one sedation session rather than as two separate procedures with two recoveries. That is the good news and it is also the reason the day is gone: you will not be in a state to drive, to sign anything, or to trust your own judgement afterwards.

Book nothing else. The most common planning mistake we see is a dinner reservation on screening evening, made by someone who read "20 to 40 minutes" for the procedure and did the arithmetic on that.

WHAT THE COLONOSCOPY ACTUALLY INVOLVES

Where it goes in the trip

Early, but not first.

Put the screening day in the first half of the trip and not on the first morning.

Early, because you get a same-day consultation on preliminary findings, and anything that consultation raises is far easier to act on while you are still in Korea with a physician who can arrange the next test. The full written report is a different matter and follows weeks later, after you have flown home.

Not the first morning, because a fast and a sedation both go better without a long-haul flight directly behind them, and because a delayed bag with your medication in it is a solvable problem on day three and a trip-shaping one on day one.

WHAT IS ACTUALLY SAME-DAY

Tell us before you fly

Three things that change the day.

Any of these is straightforward with notice and disruptive without it. Blood thinners, because a biopsy or a polyp removal may be affected. Diabetes medication, because the fast interacts with it. And any previous reaction to sedation, however minor it seemed at the time. Bring everything you take in its original packaging, and say what it is when the appointment is being arranged rather than at the desk on the morning.

Questions

Asked and answered.

When in my trip should the screening day go?: Early, and not on your first morning. Early because anything the day turns up is easier to act on while you are still in the country, with a physician who can arrange a follow-up. Not the first morning because the fast and the sedation both go better without a long-haul flight immediately behind them, and because a delayed bag containing your medication is a worse problem on day one than on day three.
How long is the fast?: Several hours, and the exact window depends on which tests your program includes and what time your slot is. Your coordinator sends the specific timing once the appointment is confirmed rather than a general rule, because a general rule is either too strict for some programs or too loose for others.
Can I do anything else that day?: Plan on nothing. If your program includes an endoscopy under sedation, you should not drive, sign anything binding, or rely on your own judgement for the rest of the day. Most people underestimate this and book dinner. The screening day is the day.
What about my regular medication?: Bring it, in its original packaging, and tell your coordinator what it is before you fly rather than on the morning. Blood thinners and diabetes medication are the two classes that most often change what can happen on the day, and both are handled easily with notice and badly without it.