When Reprocessing IFUs Conflict: A Practical Resolution Framework

Reusable medical devices are not reprocessed by a sterilizer alone. Safe processing depends on the interaction of the device design, cleaning method, disassembly instructions, packaging system, sterilizer, cycle, sterilant, loading arrangement, drying conditions, and monitoring process. The CDC describes sterilization as part of a broader system that includes decontamination, disassembly, packaging, loading, monitoring, and maintenance [1].

In practice, sterile processing teams may encounter instructions that appear to conflict. A device manufacturer may specify one sterilization method while the sterilizer manufacturer describes another. A container system may impose loading or drying restrictions. A detergent may require a rinse step that is not obvious in the device instructions. The correct response is not to choose the most convenient instruction, average the differences, or select the lowest stated value. The conflict should be treated as a controlled quality issue requiring configuration-specific review.

Why IFU conflicts matter

Each instruction set addresses a different part of the process. Device manufacturers provide instructions for processing a particular device. Sterilizer manufacturers define the operating conditions of their equipment. Packaging and container manufacturers define how their products are prepared and used. Detergent and monitoring-product manufacturers define the conditions under which their products are intended to perform.

Disassembly, flushing, connector use, packaging, cycle selection, loading, drying, and material limits are configuration-specific. Instructions from different manufacturers cannot simply be combined to create a new process. A proposed configuration must be supported by compatible manufacturer instructions or by written technical clarification. FDA guidance addresses the need for reusable-device reprocessing instructions to be scientifically validated, complete, and understandable [2]. FDA also identifies device features such as narrow channels, hinges, sleeves, and other soil-retaining structures as factors that can make cleaning and subsequent sterilization more difficult [3]. Therefore, a cycle that is appropriate for one device or configuration is not automatically appropriate for another item merely because both fit inside the chamber.

A five-step framework for resolving conflicting instructions

1. Define the exact conflict

Record the conflict in specific terms rather than describing it as “the IFUs do not match.” Identify:

• the device, model, and accessories involved;
• the exact revision or date of each instruction;
• the processing technology and sterilizer model;
• the disputed step, such as disassembly, flushing, connector use, drying, packaging, cycle selection, loading, or material limits; and
• the possible effect on cleaning, sterilant contact, material compatibility, packaging integrity, drying, or operator safety.

Document the complete proposed configuration, including the device state, accessories, tray or container, packaging, cycle, load arrangement, and monitoring products. This prevents a general instruction from being incorrectly applied to a particular configuration.

2. Compare the instructions without creating a hybrid process

Review the relevant instructions together, but do not combine isolated requirements from different manufacturers as though they establish a validated process. A device-specific flushing step, a sterilizer cycle, a container loading limit, and a packaging requirement may each be valid within their intended context without being validated together.

Pay particular attention to whether the proposed configuration can meet all applicable instructions at the same time. A passing indicator or a device that appears visibly clean does not establish that the complete configuration is suitable for processing. Do not remove or alter a device-specific step merely because it is inconvenient or because another instruction appears less demanding.

3. Do not resolve the conflict by selecting the lowest or most conservative parameter

A lower temperature, shorter exposure, smaller load, more restrictive material limit, or other “conservative” choice is not automatically safe or validated. Selecting the lowest value from conflicting instructions may create a process that no manufacturer supports. The same principle applies to choosing the most restrictive disassembly, flushing, packaging, loading, or drying instruction as an interim solution: conservatism does not establish compatibility or process validation.

Unless the complete configuration is supported by compatible manufacturer instructions or written technical clarification, place the device or load on hold. Do not substitute a different sterilization technology, alter a cycle, change the packaging configuration, or invent a device-specific processing step based only on similarity, convenience, or prior experience.

4. Communicate with the relevant manufacturers

CDC recommendation 19.b instructs facilities to compare the instrument and sterilizer manufacturers’ instructions and resolve conflicts by communicating with both manufacturers [4]. Follow this approach for the specific configuration under review. When relevant, also contact the packaging, container, detergent, or monitoring-product manufacturer.

Provide the complete configuration and ask focused questions, such as:

• Is the proposed process supported for this device model and accessory set?
• Are the specified disassembly, flushing, connector, packaging, loading, drying, and cycle conditions compatible as a complete configuration?
• Does the device manufacturer support the selected sterilization technology and cycle?
• Does the sterilizer manufacturer support the proposed device, packaging system, load arrangement, and material limits?
• Are any particular tray, container, pouch, connector, orientation, or loading conditions required?
• What should the facility do when the current device and sterilizer instructions conflict?

Request written technical clarification and retain the response with the facility’s controlled document record. A verbal recommendation that cannot be traced later is weak support for a high-consequence processing decision. If the manufacturers cannot provide compatible instructions or clarification for the complete configuration, maintain the hold and follow the facility’s escalation process.

5. Convert the resolution into controlled practice

When a supported resolution is obtained, update the local work instruction, competency materials, device profile, and, where applicable, the sterilization load record. Define who may approve changes, how obsolete IFUs are removed, and how staff are notified.

For difficult or frequently used devices, a device-specific processing card may help staff apply the current instructions consistently. It can link the current IFU revision to the required disassembly, cleaning, packaging, cycle, loading, monitoring, drying, and inspection steps. The card must not replace the manufacturer’s IFU or create requirements that are not supported by the applicable instructions or written technical clarification.

What monitoring can and cannot prove

Mechanical, chemical, and biological monitoring provide important information about the sterilization process, but they do not replace correct device preparation. A passing indicator does not demonstrate that an internal channel was adequately cleaned, that a connector was attached correctly, or that a device-specific cycle was appropriate for the complete configuration.

CDC guidance identifies sterilizer monitoring as part of a broader quality-control program and recommends recording cycle information, load contents, operator identification, and monitoring results [1]. These records are more useful when they also identify the device configuration and any approved clarification associated with the load.

When to hold the device or load

Place the item or load on hold when:

• the required device-specific process cannot be achieved;
• the device manufacturer does not support the available sterilization technology;
• the packaging or container system is incompatible or its instructions cannot be followed;
• the conflict affects cleaning access, sterilant contact, loading, drying, material compatibility, or package integrity;
• the facility cannot verify which IFU revision is current;
• the proposed configuration combines instructions without manufacturer support or written technical clarification; or
• staff would need to invent or materially alter a processing step.

Holding an item is a controlled response. It prevents an unverified assumption from becoming routine practice while the facility seeks clarification or identifies a supported alternative.

Practical implications for sterile processing leadership

Facilities can reduce IFU conflicts by including reprocessing feasibility in equipment procurement, maintaining access to current manufacturer instructions, assigning ownership for document control, and involving sterile processing personnel in device evaluation. FDA guidance describes reprocessing instructions and their implementation as involving manufacturers and healthcare facilities, among other stakeholders [2]. This does not establish identical legal responsibilities for every stakeholder; facilities should apply the responsibilities assigned by applicable instructions, policies, and requirements.

A mature program also tracks recurring conflicts. Repeated questions about the same device may indicate unclear labeling, inadequate training, an unsuitable accessory, or a procurement decision that introduced a device the department cannot reliably process.

Limitations

This framework does not establish a sterilization cycle, validate a device, or replace manufacturer instructions, applicable requirements, or facility policy. The correct resolution may vary by device model, sterilizer, packaging system, sterilant, loading arrangement, and local requirements. Where compatible written instructions or technical clarification are unavailable, the facility should follow its escalation and hold procedures rather than infer equivalence from a similar product or prior experience.

Educational disclaimer: This article is for professional education and quality-improvement discussion. It is not patient-specific medical advice and does not replace current manufacturer instructions, validated reprocessing procedures, applicable requirements, or qualified technical evaluation.

References

1. Centers for Disease Control and Prevention. Sterilizing Practices.
2. U.S. Food and Drug Administration. Reprocessing Medical Devices in Health Care Settings: Validation Methods and Labeling.
3. U.S. Food and Drug Administration. Factors Affecting Quality of Reprocessing.
4. Centers for Disease Control and Prevention. Recommendations for Disinfection and Sterilization in Healthcare Facilities.

References

1. Sterilizing Practices. Centers for Disease Control and Prevention. 2023-11-28.
2. Reprocessing Medical Devices in Health Care Settings: Validation Methods and Labeling. U.S. Food and Drug Administration. 2015-03-01.
3. Factors Affecting Quality of Reprocessing. U.S. Food and Drug Administration. 2023-05-05.
4. Recommendations for Disinfection and Sterilization in Healthcare Facilities. Centers for Disease Control and Prevention. 2023-12-07.

Educational overview. Follow the applicable product instructions, validated procedures, local regulations and your facility’s approved policies.