Bowel preparation is undoubtedly the most important part of the entire colonoscopy. Inadequate cleansing can make the procedure ineffective, requiring it to be repeated in the future. It's essential to strictly follow medical instructions regarding the pre-colonoscopy diet and prescribed laxatives.

The day before, your diet should be clear liquids only: strained broths, herbal teas, gelatin without red or purple coloring, and plenty of water.

Modern colonoscopy laxatives are much more tolerable than older ones. We currently use preparations with macrogol and ascorbic acid that achieve optimal preparation with low liquid volume. The days of drinking 4 liters of preparation solution are now a thing of the past. It's crucial to take them exactly according to medical instructions, generally divided into two doses to improve tolerance and efficacy.

Contrary to what many patients think, the pre-colonoscopy diet doesn't need to be followed for several days beforehand. New guidelines recommend only liquid diet for 24 hours before, without the need for the classic 3-day low-residue diet prior to the test.

During my stay in Tokyo more than 10 years ago, I was able to see how patients only followed the liquid diet without needing the low-residue diet, and I was surprised to see that patients were perfectly prepared. This evidence has taken a long time to "make the jump" to Europe, but it's gradually being established as the new standard.

The vast majority of colonoscopies are performed under propofol sedation, administered by an anesthesiologist. This means you'll be asleep throughout the entire procedure, without discomfort or memories of it.

Colonoscopy sedation is very safe when performed by experienced professionals. Serious side effects are extremely rare. After the procedure, you'll wake up gradually and can go home after about 30 minutes, generally accompanied by a family member or friend, as you won't be able to drive for the following 24 hours.

The duration of a colonoscopy varies according to case complexity. A routine diagnostic colonoscopy usually takes between 20 and 30 minutes. However, if intestinal polyps requiring removal are found, the procedure may extend to 45 minutes or more.

During the colonoscopy procedure, a flexible colonoscope is introduced through the anus, allowing visualization of the entire colon up to the cecum. Current technology includes high-definition systems and digital chromoendoscopy that significantly improve polyp detection.

One of the great advantages of colonoscopy is that it's both diagnostic and therapeutic. Polyps found during the procedure can be removed immediately using different techniques, depending on their size and characteristics.

For small polyps (less than 3mm), we use biopsy forceps. For larger polyps, we employ polypectomy snares with or without electrical current. In complex cases, such as large flat polyps, we use advanced techniques like endoscopic submucosal dissection (ESD), a technique I perfected during my fellowship at the National Cancer Center in Tokyo.

Colonoscopy is a very safe procedure when performed by experienced gastroenterologists. Serious colonoscopy complications are extremely rare, occurring in less than 0.1% of cases.

The most important colonoscopy risks, though infrequent, include intestinal perforation and post-polypectomy bleeding. Perforation is exceptional in diagnostic colonoscopies, and significant bleeding after polyp removal occurs in less than 1% of cases. Both complications have effective treatment when detected early.

After colonoscopy, recovery is usually very quick. Most patients can resume their normal activities the following day. It's normal to feel some abdominal distension from air introduced during the procedure, but this disappears within a few hours.

If polyps have been removed, it's recommended to avoid intense physical exertion for 48-72 hours and follow a soft post-colonoscopy diet for the first day. It's important to maintain adequate hydration and contact your doctor if severe abdominal pain, fever, or rectal bleeding appears.

One of the advantages of colonoscopy is that the doctor can inform you immediately about the main findings. You'll know if polyps have been found, their number, size, and general characteristics.

However, to know the exact nature of lesions found, it's necessary to wait for the histopathological study results of the biopsies, which are usually available within about 2 weeks. This microscopic analysis determines whether polyps are benign, precancerous, or malignant - crucial information for planning follow-up.

The frequency of future colonoscopies depends completely on the findings of the current procedure. If no polyps are found and you have normal family history, the next colonoscopy will be scheduled in 10 years.

If low-risk polyps are found (1-2 small adenomas), follow-up will be every 5-10 years. For high-risk polyps (multiple, large adenomas or those with high-grade dysplasia), follow-up will be closer, generally every 3 years. Cases with family history of colorectal cancer require specific follow-up protocols.

The most important message I want to convey is that colonoscopy saves lives. It not only detects colorectal cancer in early stages when it's curable, but prevents it by removing precancerous polyps.

Scientific studies have demonstrated that screening programs with colonoscopy reduce colorectal cancer mortality by up to 60%. In the Community of Madrid, I participate in the Prevecolon program, which has shown extraordinary results in early detection of lesions.