Flexible Endoscope Storage: Drying Cabinets, Hang Time and Traceability

Why drying and storage matter

Moisture left in the channels allows bacteria to multiply, so drying is as important as disinfection. Many outbreaks linked to flexible endoscopes have been traced to residual moisture and poor storage, not only to cleaning failures. For that reason most guidelines treat drying, storage and traceability as part of the reprocessing cycle, not as an afterthought.

The principle is simple: after high-level disinfection and rinsing, remove water from the outside and inside of the scope, then keep it hanging in a clean, dry, ventilated place where it cannot touch surfaces or other scopes.

How flexible endoscopes should be dried

Drying usually combines an alcohol flush where permitted, forced filtered air through all channels, and wiping the exterior with a lint-free cloth. Compressed air must be clean, oil-free and filtered, and pressure must stay within the manufacturer's limit to avoid damaging the channels.

Many hospitals now use a drying and storage cabinet that supplies filtered air to the channels continuously. Whether you dry manually, in an AER or in a cabinet, follow the scope manufacturer's instructions and your local infection control policy.

Storage conditions and hang time

Storage rules usually specify that scopes hang vertically with the distal end free, with valves and caps removed or loosened as the instructions say, in a closed cabinet or dedicated clean room. Cases for transport are not for storage, because a closed case traps humidity.

Hang time, the period for which a dried and stored scope is regarded as ready for use without reprocessing, is defined differently by different guidelines and national policies, and some facilities base it on a risk assessment. We recommend that your infection control team sets the hang time in writing, using the current guideline that applies to your hospital, and that the unit logs the reprocessing time on each scope.

Choosing an endoscope storage cabinet

A cabinet should be matched to your volume and your scope types. Compare the following points before you buy:

• Capacity and the number of scopes of each length that must hang freely
• Filtered air supply to channels versus passive ventilation, and the filter class (such as HEPA) with replacement interval
• Door type, lockability and glass or opaque front
• Material and ease of cleaning of the interior
• Connection to tracking or logging systems
• Compatibility with the scopes you own and the adaptors needed
• Service and filter supply in the UAE

Traceability, audits and common mistakes

Every scope should carry an identifier, and the system should record who reprocessed it, when, with which machine or disinfectant and which patient used it. Spot checks, culture sampling according to local policy and regular audits help detect failures before they reach a patient.

Frequent mistakes include storing scopes coiled, with valves attached, or in the transport case; returning wet scopes to the cabinet; overloading the cabinet so scopes touch; and not recording reprocessing time. The full cycle is explained in the flexible endoscope reprocessing steps article, and automated endoscope reprocessors are discussed separately.

Support and equipment

Beckfinity supplies sterilisation and reprocessing equipment for hospitals and clinics in the UAE; see the sterilization category. If you are designing an endoscopy suite, contact our team to discuss storage and workflow.