Scoped and Exposed: The Endoscope Reprocessing Crisis That U.S. Hospitals Have Yet to Fully Solve

Every year, tens of millions of Americans undergo endoscopic procedures — colonoscopies, upper gastrointestinal endoscopies, bronchoscopies, and a range of other minimally invasive examinations that rely on flexible, camera-equipped tubes navigating the body's interior. These procedures are widely considered safe, often lifesaving, and routinely performed in hospitals and outpatient centers across the country. What most patients are never told, however, is that the instrument entering their body may carry a contamination risk that no amount of visual inspection can detect — and that the disinfection process intended to eliminate that risk is among the most failure-prone in all of modern medicine.

At SteriPuram, our commitment to precision care and sterile standards demands that we examine not only the protocols that work, but the ones that frequently do not. Endoscope reprocessing represents one of the most consequential and persistently underaddressed vulnerabilities in U.S. hospital infection control.

Why Endoscopes Are Different — and Dangerous

Most surgical instruments can be subjected to steam sterilization, a high-heat process that reliably destroys bacteria, viruses, fungi, and spores. Flexible endoscopes cannot. Their complex internal architecture — narrow lumens, articulating joints, delicate optical components, and electronic channels — would be destroyed by the temperatures required for autoclave sterilization. As a result, hospitals rely on a process called high-level disinfection, or HLD, which uses chemical agents such as glutaraldehyde, peracetic acid, or ortho-phthalaldehyde to reduce microbial contamination to a theoretically safe level.

The critical distinction is this: high-level disinfection is not sterilization. It is designed to eliminate most, but not necessarily all, pathogenic organisms. Under ideal conditions, HLD is considered sufficient for semi-critical devices — those that contact mucous membranes but do not penetrate sterile tissue. In practice, however, the conditions required for HLD to work as intended are rarely as straightforward as the protocols suggest.

A Trail of Outbreaks, A Pattern of Failure

The consequences of inadequate endoscope reprocessing are not theoretical. They are documented, traceable, and devastating.

Between 2012 and 2015, more than 250 patients across U.S. hospitals were infected with carbapenem-resistant Enterobacteriaceae, or CRE, linked to contaminated duodenoscopes — a specialized endoscope used in a procedure called ERCP (endoscopic retrograde cholangiopancreatography). CRE carries mortality rates as high as 50 percent in some patient populations. Investigations revealed that the elevator mechanism at the tip of the duodenoscope — a small, hinged component essential to the instrument's function — harbored residual tissue and bacteria that standard reprocessing protocols could not reliably reach.

The FDA issued multiple safety communications. Manufacturers revised their instructions. Hospitals updated their protocols. And yet subsequent surveillance studies continued to find contamination rates in reprocessed duodenoscopes that ranged from 3 to 20 percent depending on the facility and sampling methodology. The problem, investigators concluded, was not merely a design flaw in one type of device. It was systemic.

Subsequent investigations identified similar patterns with bronchoscopes and standard gastrointestinal endoscopes. A 2018 study published in the American Journal of Infection Control found that a significant proportion of endoscopes sampled immediately after reprocessing still carried detectable microbial contamination. The causes were varied: improper manual cleaning prior to chemical disinfection, insufficient contact time with the disinfectant solution, inadequate drying before storage, and failure to follow manufacturer-specific reprocessing instructions that differ — sometimes significantly — from one device to the next.

The Regulatory Gap

The FDA regulates endoscopes as medical devices, but the agency's authority over how hospitals actually reprocess them is limited. Reprocessing protocols are largely governed by manufacturer instructions, accreditation standards set by organizations such as The Joint Commission, and guidelines from professional bodies including the Society of Gastroenterology Nurses and Associates and the Association for the Advancement of Medical Instrumentation. These guidelines are evidence-based and regularly updated, but compliance is voluntary in many respects, and enforcement is inconsistent.

In 2019, the FDA took the notable step of recommending that hospitals transition away from standard HLD for duodenoscopes toward either ethylene oxide sterilization, liquid chemical sterilization systems, or the use of single-use disposable models — an acknowledgment that high-level disinfection alone was insufficient for the most complex endoscope designs. The transition has been slow. Disposable duodenoscopes have entered the market and shown promise in early studies, but adoption remains uneven, driven in part by cost considerations and supply chain constraints.

Beyond duodenoscopes, broader regulatory reform of endoscope reprocessing standards has stalled. The FDA continues to receive adverse event reports linked to endoscope contamination, and independent researchers have repeatedly called for mandatory post-reprocessing surveillance cultures — a practice that would allow hospitals to detect contamination before a patient is harmed. Currently, such surveillance is recommended but not universally required.

What Happens in the Reprocessing Suite

Understanding why endoscope reprocessing fails so frequently requires understanding what the process actually demands. A properly reprocessed flexible endoscope must pass through multiple sequential steps: pre-cleaning at the point of use, leak testing, manual cleaning with enzymatic detergent, thorough rinsing, high-level disinfection in an automated or manual system, additional rinsing, drying — particularly of internal channels, which are prone to moisture-related biofilm formation — and appropriate storage in a ventilated cabinet that prevents recontamination.

Each of these steps is an opportunity for error. Manual cleaning, which must occur before automated disinfection can be effective, is highly technique-dependent. Studies have shown that even trained technicians demonstrate significant variability in cleaning thoroughness, particularly within the narrow internal channels that are invisible to the naked eye. Automated endoscope reprocessors, while more consistent than manual methods, are only as effective as the cleaning that precedes them — and they cannot compensate for residual organic material that was not removed during the manual phase.

Staffing pressures, high procedure volumes, and inadequate training compound these risks. Endoscope reprocessing technicians are among the most critically important personnel in any facility performing endoscopic procedures, yet their role is frequently underresourced and undervalued relative to its infection control significance.

What Patients Can and Should Demand

For patients scheduled for any endoscopic procedure, the standard of informed consent should extend beyond the procedure itself to the reprocessing practices of the facility. The following questions are reasonable, appropriate, and — at any institution that takes sterile standards seriously — should be answerable without hesitation.

Ask whether the facility uses single-use or reusable endoscopes. For certain procedures, particularly those involving duodenoscopes or bronchoscopes, single-use devices eliminate the reprocessing variable entirely. Their availability is expanding, and patients have the right to inquire whether they are an option.

Ask about post-reprocessing surveillance. Does the facility culture endoscopes after reprocessing on any routine basis? Facilities that conduct surveillance — and act on the results — demonstrate a measurably higher commitment to patient safety.

Ask about staff training and certification. Reprocessing technicians should be certified through recognized programs such as those offered by the Certification Board for Sterile Processing and Distribution. Ask whether the staff performing reprocessing hold current credentials.

Ask about turnaround time. Endoscopes that are rushed through reprocessing to meet high-volume scheduling demands are endoscopes at elevated contamination risk. Facilities that allow adequate time between procedures — and maintain sufficient instrument inventory to support that — are operating with patient safety as a genuine priority.

Precision Standards Applied to the Most Difficult Devices

The promise of precision care is not fulfilled by excellence in the operating room alone. It extends to every instrument, every surface, and every reprocessing cycle that stands between a patient and a preventable infection. Flexible endoscopes represent the most technically demanding test of that commitment, and the evidence suggests that too many U.S. facilities are still falling short.

Patients deserve transparency. Facilities that provide it — and that invest in the training, technology, and time required to reprocess endoscopes correctly — are the ones truly operating at sterile standards. Before your next colonoscopy, bronchoscopy, or upper GI procedure, ask the questions. The answers will tell you more about your actual risk than any brochure in the waiting room ever will.