Reprocessing Requirements for Ultrasound Probes and Endoscopes: Which Rules Apply in Canada vs the US FDA and CDC?

Stainless steel ultrasonic cleaning tank with a removable mesh basket used to clean medical instruments before disinfection

Ultrasound probes and flexible endoscopes share a problem that a dental clinic's steam sterilizer does not solve: most of them cannot take the heat. That single constraint pushes both device families into a reprocessing conversation that runs on cleaning validation, high-level disinfection chemistry and documentation — and it runs differently depending on which side of the border the clinic sits.

This page sets out what each document actually says. It reports published requirements and published recommendations; it does not substitute for a device's own instructions for use, which remain the governing document in every jurisdiction reviewed here.

Why do probes and endoscopes usually stay out of the autoclave?

The Public Health Agency of Canada's guidance for flexible gastrointestinal endoscopy and flexible bronchoscopy states the position directly: there are some bronchoscopes that can be steam sterilized, but most flexible endoscopes require low temperatures for disinfection or sterilization. The same document adds that low-temperature sterilization below 60 °C is required for temperature- and moisture-sensitive critical devices.

The CDC's disinfection and sterilization guideline reaches the same conclusion from the materials side: ethylene oxide is used for critical and sometimes semi-critical items that are moisture- or heat-sensitive and cannot be sterilized by steam, and hydrogen peroxide gas plasma is a further low-temperature route. Flexible endoscopes are also difficult to clean — the same guideline records bioburden on used flexible gastrointestinal endoscopes in the range of 10⁵ to 10¹⁰ colony-forming units per millilitre, with the highest levels in suction channels.

So the practical boundary is drawn by device design and material, not by preference. Rigid scopes that reach sterile tissue — arthroscopes and laparoscopes — sit in the critical class, where sterilization is the objective. Flexible scopes that contact mucous membranes sit in the semi-critical class, where high-level disinfection is the floor.

What does the Spaulding classification require for each class?

Every Canadian and US document reviewed here builds its requirements on the same three-way split, with the device's intended use deciding the class. Ontario's provincial guidance adds a tie-breaker rule worth quoting because it removes discretion: if the level of reprocessing recommended by the manufacturer conflicts with the intended use under the classification, the higher of the two must be used.

Class Contact Minimum process Ultrasound probes as classified in the sources Endoscopes as classified in the sources
Non-critical intact skin cleaning followed by low-level disinfection external surface probes for abdominal imaging; probes used for external needle guidance not applicable
Semi-critical mucous membranes or non-intact skin cleaning followed by high-level disinfection at minimum endocavity probes — vaginal, rectal and transesophageal flexible gastrointestinal endoscopes; bronchoscopes
Critical sterile tissue or the vascular system sterilization probes used inside sterile body cavities laparoscopes, arthroscopes, intraoperative enteroscopy; all endoscope biopsy accessories

Two clarifications appear in more than one jurisdiction and are routinely missed in clinic procedures. First, a probe cover is not a substitute for reprocessing. Alberta's college guidance states that sterile or clean barriers applied to probes do not replace proper reprocessing, because microscopic tears or improper application compromise barrier performance; the BC provincial probe recommendations make the same point — use of a probe cover does not remove the requirement to clean and disinfect the ultrasound probe after each patient use. The CDC guideline documents why: published perforation rates for covers include 0 per cent, 25 per cent and 65 per cent for unused sterile transvaginal covers from three suppliers.

Second, the class follows intended use rather than habit. A probe that only touches intact skin is non-critical and needs cleaning plus low-level disinfection; the moment the same probe is used endocavitarily it is semi-critical and the floor becomes high-level disinfection. The classification is a property of the use, not of the model number.

Stainless steel ultrasonic cleaning tank with a removable mesh basket used to clean medical instruments before disinfection

How does Canadian provincial guidance line up against US FDA and CDC material?

The two countries regulate different parts of the same process. In Canada, provincial infection prevention and control programmes publish the reprocessing guidance that health authorities and, in some provinces, professional colleges expect clinics to follow. In the United States, CDC and its advisory committee publish infection-control guidance for care settings, while the FDA regulates the device side — what reprocessing instructions a manufacturer must validate and print. Neither US document is a Canadian requirement, and the table below keeps the jurisdictions separate on purpose.

Jurisdiction and instrument Device scope Process expectation as published Barrier position Validation and records
Ontario — Public Health Ontario provincial guidance for cleaning, disinfection and sterilization in all health care settings (May 2013) all critical and semi-critical medical equipment, including endoscopes classification by intended use; higher of manufacturer or classification level prevails; automated endoscope reprocessor steps must follow both manufacturers' instructions not treated as a reprocessing substitute written policies, reprocessing records, environmental criteria for reprocessing rooms
Alberta — College of Physicians and Surgeons of Alberta, infection prevention and control FAQ on reprocessing ultrasound transducers (November 2025) ultrasound transducers reprocessed after each use and before reuse; non-critical low-level, semi-critical high-level, critical sterilization barriers do not replace reprocessing solution name with DIN or device licence and lot, test strip details, minimum effective concentration results, contact time and temperature, cycle parameters, device identifier, personnel
British Columbia — provincial ultrasound probe recommendations (2018 revision) and provincial cleaning, disinfection and sterilization guidelines ultrasound probes across health care settings external probes: cleaning plus low-level disinfection; endocavity probes: cleaning plus high-level disinfection; an oxidizing high-level disinfectant with a non-enveloped virus claim is recommended for endocavity probes probe cover required in addition, not instead follow the probe instructions for use; provincial minimum standard adopted for flexible endoscope reprocessing
Canada — Public Health Agency of Canada guidance for flexible gastrointestinal endoscopy and flexible bronchoscopy flexible endoscopes and accessories three stages: cleaning; high-level disinfection or sterilization with a product approved for use in Canada; post-processing handling and storage accessories and valves reprocessed as separate items audit of reprocessing steps; conflict resolution between scope and reprocessor instructions; report to Health Canada where a manufacturer's instructions are inadequate
United States — CDC/HICPAC guideline for disinfection and sterilization in healthcare facilities (2008, updated) patient-care devices including probes and endoscopes semi-critical items receive high-level disinfection at minimum; critical items are sterilized; heat-sensitive critical items use low-temperature processes new cover per patient plus high-level disinfection of the probe process monitoring as part of the facility's infection-control programme
United States — HICPAC essential elements of a reprocessing program for flexible endoscopes flexible endoscopes manual cleaning is the most critical step; residual organic material reduces the effectiveness of high-level disinfection and sterilization covers do not remove the cleaning requirement document endoscope and patient identifiers; record procedure end time and the start time of manual cleaning
United States — FDA guidance on reprocessing medical devices in health care settings (2015, Appendix E updated 2017) reusable devices including endoscopes and ultrasound transducers manufacturer's labelling must state reprocessing instructions matching the intended use; devices listed in Appendix E should carry cleaning and disinfection or sterilization validation data in a premarket notification cover or sheath instructions must assume worst-case use validation of cleaning as well as disinfection or sterilization instructions

The pattern that emerges is narrow and useful. All four Canadian sources and both US guidance families require the same first step — thorough cleaning — and all of them defer the details to the manufacturer's instructions for use. What differs is where the obligation lands. In Canada it lands on the facility through provincial guidance and, in some provinces, a college's requirements; in the United States the CDC and HICPAC material advises the facility, while the FDA obligation lands on the manufacturer that must validate and label the reprocessing instructions.

What has to be documented after each high-level disinfection cycle?

Documentation is where the Canadian sources are unusually specific, and where a clinic that has been treating reprocessing as a bench task usually discovers a gap. Alberta's college FAQ lists the minimum record set for manual high-level disinfection and links each item to its requirements document.

Record What the Alberta guidance asks for Comparable US expectation
High-level disinfectant product name, DIN or medical device licence number, and batch or lot number disinfectant selection and monitoring within the facility's programme
Test strips product name, lot number and expiry date not itemised at this level
Minimum effective concentration testing date, time and result of each test not itemised at this level
Contact time and temperature the exact figures recorded for each disinfection cycle reprocessing within the cycle parameters set by the device and reprocessor instructions
Automated reprocessor cycle cycle type, duration, and any alerts or warnings cycle monitoring as part of programme oversight
Device identifier transducer model, or serial number where applicable endoscope identifier
Personnel who performed the reprocessing of each individual device not itemised at this level
Patient linkage the clinic must track high-level disinfected transducers and link them to patients endoscope and patient identifiers are documented so that a failure or recall can be traced
Timing not itemised at this level procedure end time and the start time of manual cleaning

That last row is the one most often missing from Canadian clinic logs and most often present in US endoscope programmes, which have had a specific reason to stay tight: the HICPAC document reports that supplemental measures after high-level disinfection for duodenoscopes have not been included as essential elements because the evidence on benefits and unintended consequences is not yet sufficient, and it directs facilities to report suspected transmission through MedWatch.

Which room and ventilation requirements apply to manual high-level disinfection?

Manual high-level disinfection carries the environment with it. Alberta's FAQ states that ortho-phthalaldehyde requires a reprocessing room with ten air changes per hour for adequate ventilation, and that if the reprocessing area does not meet the safety-data-sheet ventilation requirements, that chemistry cannot be used there at all. Ontario's provincial guidance sets the sterile processing department criteria as a minimum of eight air changes per hour in soiled areas and ten in clean areas, with at least two and three outdoor-air changes respectively, negative pressure in soiled areas, positive pressure in clean areas, exhaust vented outdoors and not recirculated, and no portable fans in any part of the department. The same document gives 18 °C to 20 °C for decontamination areas and 20 °C to 23 °C for clean areas, with relative humidity between 30 per cent and 60 per cent, preferably 40 to 50 per cent.

CliniEco Medical enzymatic ultrasonic cleaning solution, non-foaming four litre concentrate for instrument cleaning

Where does cleaning fit, and what equipment does it take?

Every source reviewed here treats cleaning as the step that decides whether the rest of the process can work. The CDC advisory committee guidance states that manual cleaning is the most critical step in the disinfection process, because residual organic material reduces the effectiveness of disinfection and sterilization, and that cleaning must happen within the timeframe the manufacturer's instructions specify. The Alberta FAQ adds that manual cleaning must occur before an automated transducer reprocessor is used, and that disinfecting wipes should not be used as the pre-cleaning step when high-level disinfection is to follow, because residues can interfere with the high-level disinfectant.

For the cleaning hardware itself, Ontario's provincial guidance strongly recommends ultrasonic cleaning for any semi-critical or critical device with joints, crevices, lumens or other hard-to-clean areas, requires that the device be completely immersed, and requires the ultrasonic unit to be used and maintained according to its manufacturer's instructions. The BC provincial probe recommendations add the timing discipline that makes cleaning possible at all: probes should be cleaned immediately after use so that gel residue and organic material do not dry on the surface.

Two standards anchor the paperwork around this step. ISO 17664 defines the reprocessing information a device manufacturer must supply, which is the document a clinic produces during an inspection; ISO 15883 covers washer-disinfectors, and the CSA Z314 series covers sterilization and reprocessing practice in Canadian health care facilities.

Should a clinic treat the US documents as its own requirements?

No — and mixing the two sources is the most common error in cross-border content on this topic. The FDA guidance is addressed to device manufacturers and states what must be validated and printed in labelling; it does not tell a Canadian clinic which disinfection chemistry to use. The CDC guideline is a US infection-control guidance document. The requirements that bind a Canadian clinic come from its province's guidance, from a college's requirements where one applies, and from the device's own instructions for use. Read the US material as a comparison and as a source of technical detail, not as the standard to cite in a Canadian policy.

Related reading

Frequently Asked Questions

Can a probe cover replace high-level disinfection of an ultrasound probe?

No. Alberta's college guidance states that sterile or clean barriers are not a substitute for proper reprocessing, and the BC provincial probe recommendations state that using a probe cover does not remove the requirement to clean and disinfect the probe after each patient use. The CDC guideline documents cover failure rates that support the same conclusion.

Why can a flexible endoscope not simply be steam sterilized?

Because most flexible endoscopes are not built to take it. The Public Health Agency of Canada's endoscopy guidance states that some bronchoscopes can be steam sterilized but most flexible endoscopes require low-temperature disinfection or sterilization, and that low-temperature sterilization below 60 °C is required for temperature- and moisture-sensitive critical devices.

What is the difference between high-level disinfection and sterilization for these devices?

Sterilization destroys all microbial life including bacterial spores; high-level disinfection destroys all microorganisms except high numbers of bacterial spores. Devices that enter sterile tissue or the vascular system are in the critical class and are sterilized, while devices contacting mucous membranes or non-intact skin are semi-critical and receive high-level disinfection at minimum.

Do the US CDC and FDA documents apply to a Canadian clinic?

They are not Canadian requirements. The CDC guideline is US infection-control guidance, and the FDA guidance is addressed to device manufacturers about validation and labelling. Canadian requirements come from provincial guidance, from a college's requirements where applicable, and from the device's own instructions for use.

What records does a manual high-level disinfection cycle need?

Alberta's college guidance lists the disinfectant name with its identification number and lot, test strip details, the date, time and result of minimum effective concentration testing, the exact contact time and temperature, automated reprocessor cycle parameters, the device identifier, and the name of the person who performed the work, with disinfected transducers tracked and linked to patients.

Does the manufacturer or the guidance document decide the reprocessing level?

The intended use decides the class, and the manufacturer's instructions supply the method. Ontario's provincial guidance resolves a conflict between the two by requiring the higher level to be used, which means a clinic cannot adopt the lighter of two published positions.

Sources

All documents read on 30 September 2026. Where a document was reachable only through a Canadian network route, that is noted in the receipt for this batch rather than in the citation.

Standards are cited by number only. ISO 17664 defines the reprocessing information a device manufacturer supplies; ISO 15883 covers washer-disinfectors; the CSA Z314 series covers sterilization and reprocessing practice in Canadian health care facilities. Where a device is supplied with instructions for use, those instructions govern the method.

CliniEco Medical distributes medical supplies in Canada under MDEL #35334.

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