A perforated colon during a colonoscopy is not automatically malpractice. Perforation is a known, documented risk of the procedure that can happen even when the doctor performs everything correctly. Winning a malpractice claim based solely on the fact that a perforation occurred is extremely difficult, because courts and medical experts widely acknowledge that perforation can result from a competently performed colonoscopy. Where malpractice typically enters the picture is not the perforation itself, but what happens afterward.
Perforation Is a Known Risk of Colonoscopy
Colonic perforation occurs in roughly 0.016% to 0.2% of diagnostic colonoscopies. When the procedure involves removing polyps or other therapeutic work, that rate climbs to as high as 5%. These numbers are well-established in gastroenterology literature and are part of what every patient should be informed about before the procedure begins.
Several factors raise the risk beyond those baseline numbers. Patients aged 70 or older, those with a low body mass index, and those who are sedated during the procedure face a statistically higher chance of perforation. Inpatient procedures and less experienced endoscopists also carry elevated risk. None of these factors, on their own, make a perforation negligent. But they do raise the bar for how carefully the doctor should proceed and how thoroughly the risks should be discussed beforehand.
What Separates a Complication From Malpractice
The legal distinction comes down to the standard of care. A known complication becomes malpractice when the doctor deviated from what a reasonably competent physician would have done in the same situation. Proving that requires showing the provider did something wrong, not just that something went wrong.
In practice, this is a high bar for perforation cases. There is almost never enough documentation in the medical record to prove that inserting the scope or removing a polyp was done negligently. The procedure happens inside the body, often without witnesses beyond the medical team, and the records typically don’t contain the kind of detail that would support a negligence claim about technique alone. As one review in Gastroenterology & Hepatology put it, it is very difficult for a plaintiff to win a case of perforation based only on the fact that a perforation occurred.
That said, a malpractice claim can absolutely succeed when the issue is how the perforation was managed, not whether it should have happened in the first place.
Where Malpractice Claims Actually Succeed
The most winnable perforation lawsuits involve what happened after the hole was made. Specifically, they center on delayed diagnosis, failure to recognize warning signs, or inadequate follow-up. If a doctor sends you home after a colonoscopy and you return with severe abdominal pain, distention, or difficulty breathing, and those symptoms are dismissed or attributed to normal post-procedure discomfort, that delay can turn a treatable complication into a life-threatening emergency.
The numbers from closed malpractice claims between 2010 and 2020, reviewed by the American Society for Gastrointestinal Endoscopy, paint a stark picture. Puncture or perforation was the most common major injury in ambulatory endoscopy units, with the colon being the most frequently affected site. Nearly half of all claims involved the patient needing an additional surgery. Twenty-two percent of claimants required hospitalization, 10% developed sepsis, and 19% died from their injury.
Those deaths and severe outcomes are often where the legal case lies. When a perforation is caught immediately during the procedure, it can frequently be closed right then using clips or other endoscopic tools. When it’s missed and the patient deteriorates over hours or days, the consequences escalate dramatically. Stool leaks into the abdominal cavity, infection spreads, and sepsis can set in. A case where the surgeon failed to follow up on imaging results, delayed exploratory surgery despite clear warning signs, or ignored a patient’s worsening symptoms is a fundamentally different legal situation than a perforation that was promptly identified and repaired.
The Role of Informed Consent
Before your colonoscopy, you should have signed a consent form that specifically mentioned perforation as a possible risk. Both American and British gastroenterology guidelines require written informed consent that covers the nature of the procedure, why it’s being recommended, the benefits and risks, and what alternatives exist.
If your individual risk was higher than average due to age, frailty, or other health conditions, guidelines recommend that the elevated risk be specifically discussed and documented. A consent form that uses only generic language for a high-risk patient could become a factor in a legal claim, though informed consent issues alone rarely carry a case. The stronger argument is almost always about what happened after the perforation occurred.
There’s also a practical reality about consent forms: research shows many patients sign them without fully reading or understanding the content. Courts generally still consider the consent valid if the information was provided, but a complete absence of any consent discussion, or a missing consent form entirely, weakens the defense significantly.
Signs a Perforation Was Mismanaged
If you’re trying to assess whether what happened to you or a family member crosses from complication into potential malpractice, the key questions center on timing and response. Clinical guidelines lay out a clear protocol: when a perforation is suspected, the doctor should monitor vital signs, administer IV fluids and antibiotics effective against gut bacteria, attempt to close the defect endoscopically if possible, and switch from room air to carbon dioxide gas (which the body absorbs much faster and causes less harm if it escapes into the abdomen). If the perforation wasn’t caught during the procedure, guidelines call for a very low threshold of suspicion for any patient who develops abdominal pain, severe bloating, difficulty breathing, or signs of air under the skin afterward.
The situations that most often lead to successful claims look like this:
- Dismissed symptoms: You called or returned with worsening abdominal pain and were told it was normal post-procedure discomfort, delaying diagnosis by hours or days.
- Failure to follow up on imaging: A CT scan or X-ray showed free air in the abdomen, but the results weren’t acted on promptly.
- Delayed surgery: Despite signs pointing to perforation and leakage, the decision to operate was postponed, allowing infection to spread.
- No post-procedure instructions: You weren’t told what symptoms to watch for or when to seek emergency care.
What a Malpractice Case Requires
To pursue a colonoscopy perforation malpractice claim, you generally need to establish four things. First, the doctor owed you a duty of care, which is straightforward in any doctor-patient relationship. Second, the doctor breached the standard of care, meaning they did something (or failed to do something) that a competent physician in the same specialty would not have done. Third, that breach directly caused your injury. And fourth, you suffered actual damages, whether that’s additional surgery, extended hospitalization, lasting physical harm, or the death of a family member.
The second and third elements are where most cases are won or lost. Because perforation itself is a recognized risk, proving the breach usually requires showing the doctor’s response was inadequate rather than that the perforation shouldn’t have happened. Medical expert testimony is almost always needed to establish what the standard of care required and how the treating physician fell short. Cases involving delayed diagnosis and subsequent sepsis or death tend to produce the strongest claims, because the gap between what should have happened and what actually happened is clearest.