How Long Should Leak Testing Take?

Published on:

February 17, 2026

• Expert Q&A

Question:

How long should an endoscope be leak tested for, and is there a minimum or maximum time requirement?

Answer:

Manufacturer Instructions for Use (IFUs) for most flexible endoscopes typically state that leak testing should be performed for at least 30 seconds, while professional guidance such as AAMI ST91 recommends leak testing for at least 60 seconds. These timeframes establish a minimum expectation, not a guarantee that all leaks will be identified.

In practice, leak testing is not simply a timed step, it is an assessment. Leaks can be small, intermittent, and difficult to detect. Some may only become visible when the scope is fully pressurized, manipulated, and carefully observed over time. Focusing solely on meeting a minimum duration may result in missed damage.

Any portion of the endoscope, including the insertion tube, bending section, distal tip, control body, and endoscope connector can experience damage that may be revealed during leak testing. Taking additional time to thoroughly inspect the scope, especially when findings are unclear, can help identify issues early.

Identifying leaks promptly matters. If fluid enters an endoscope, internal components may be compromised, potentially leading to more extensive damage and higher repair costs. In contrast, early detection of minor leaks may help prevent more significant device failure.

Bottom line:

While IFUs and standards define minimum leak testing times, quality leak testing cannot be reduced to a stopwatch. Thorough pressurization, careful manipulation, and deliberate observation are essential to identifying damage and protecting both the device and long-term costs.