Exams
A colonoscopy travels the inside of the large intestine, and its preparation starts days before the appointment
Which segment of the bowel does my order cover?
The large intestine runs about a metre and a half and can be examined whole or in parts. Fonasa's 2026 MLE fee schedule splits those options into separate billable services, and the centre's calendar inherits that split.
| Catalogue name | Code | What it covers |
|---|---|---|
| Colonoscopía larga (includes sigmoidoscopy and left colonoscopy) | 18-01-006 | The entire large intestine |
| Sigmoidoscopy and left colonoscopy with a flexible tube | 18-01-007 | The left segment, shorter |
| Ano-recto-sigmoidoscopy in adults | 18-01-004 | The final centimetres, with a rigid tube |
The segment changes everything else: how long the appointment runs, how much preparation is asked for, and whether sedation is needed. That is why schedulers insist on reading the whole order rather than stopping at the word colono.
Is a virtual colonoscopy a colonoscopy?
It shares the name and little else. The fee schedule lists it as tomografía computarizada de colonoscopía virtual, code 04-03-023, inside the imaging group. It happens in the CT scanner suite, with different equipment, a different professional and a different calendar.
The practical consequence is a scheduling one. An order that says virtual plus a call to the endoscopy desk ends in an appointment nobody there can give, and the patient hangs up believing there are no slots.
What does the centre need before releasing a slot?
Bowel preparation comes first. MedlinePlus puts it plainly: your bowel needs to be completely empty and clean for the exam. That means several days of instructions starting long before you get on the gurney.
Then come sedation, a companion and the signed order. Some centres add a prior assessment. Exam preparation differs by centre and sometimes between endoscopists inside the same centre, and that difference is deliberate.
What does the rest of the day look like?
Under sedation, the day is not yours. MedlinePlus is explicit: you must plan to have someone take you home after the test because you will be woozy and unable to drive. Many centres will not discharge you if nobody comes to collect you.
Why is this the order that falls through most?
Because it has more failure points than any other outpatient exam. Preparation lasts days, and each day is a chance to start late, misread an instruction or give up. When that happens the slot is lost on the day itself and the room sits empty with no warning: a no-show nobody can backfill in time.
That empty slot is among the most expensive of the day, since it ties up room, endoscopist and sedation at once. Exams with multi-day preparation are the highest-drop exams in any Chilean clinic, and saying so plainly is the first step to treating them differently.
What should I do if I am holding one?
Read the whole order before you call.
Note whether it says larga, izquierda, virtual or with polypectomy. That word decides which unit to call.
Ask for the preparation in writing the day you book.
By email or WhatsApp, with concrete dates counted backwards from your appointment.
Put the first day of preparation in your calendar.
The date that governs is the first day of instructions, counted backwards from your appointment.
Confirm a companion and a ride home.
Without someone to take you home the appointment collapses even if everything else went right.
Give early notice if something changes.
An early warning frees the slot for someone on the waiting list.
Getting the preparation in writing, with reminders on the day they matter and someone on the other end to answer questions, already exists. Ask your health centre whether they work with Surface.