A Canadian diagnostic lab in this review had a spore test fail on a Monday morning, and the investigation that followed changed more than the one load that was affected. The lab did not simply repeat the test and move on. It treated the failure as a signal about its monitoring routine, its incubator handling, and the way its records linked a lot to a cycle. What the lab changed afterwards is a useful template for any facility that runs a large number of loads.
What did the lab find after the spore test failure?
The first repeat test on the same sterilizer passed, which is exactly the situation that tempts a lab to close the file. The lab kept the investigation open and looked at the batch of biological indicators in use, the incubator temperature, and the time between processing and incubation. What it found was not one dramatic fault but a combination: indicators from an older lot were still in the drawer, one incubator well ran cooler than the others, and several vials had waited longer than they should before incubation. Each factor on its own was small.
Which records decided the investigation?
The lab could reconstruct the event because the cycle log named the load, the indicator lot, and the sterilizer. Without those entries the repeat test would have been the only evidence, and a passing repeat would have ended the review. Records that link a lot to a cycle are the difference between an investigation and a guess. The lab also kept the failed indicator itself, which let it confirm the result rather than assume it was a false positive.
| Factor | What the lab found | What it changed |
|---|---|---|
| Indicator lot | An older lot was still in the drawer | First-in-first-out stock rotation |
| Incubator wells | One well ran cooler than the others | Temperature confirmed before each run |
| Time to incubation | Some vials waited longer than intended | Fixed window for loading the incubator |
| Result record | Lot and cycle were linked | Kept the same linkage going forward |
| Failed vial | Retained with its packaging | Stored until the review closed |
How did the lab change its monitoring routine?
The lab tightened the steps that sit either side of the test. Indicators are rotated so the oldest lot is used first, and any lot past its expiry is removed from the reprocessing area. Incubator wells are checked before vials are loaded, and the incubator is given time to reach temperature rather than being loaded cold. Vials are incubated within a set window after processing. None of these steps requires new equipment; they are habits that make a single result easier to interpret when something goes wrong.
Where does CliniEco fit?
Labs that run many loads find the routine easier when the indicator supply and the incubator are treated as one system. CliniEco Medical supplies 24-hour rapid readout biological indicators in a 50-pack and a 24-well precision dry block incubator that keeps well temperature consistent across a full run. Matching the two makes it simpler to compare results across days.
How should the lab have handled the load that failed?
The affected load should be held and not released, and any items from it that were already in use should be recalled where that is practical. The lab kept the load and re-processed it only after the sterilizer had been checked, which is the safer order of events because it separates a monitoring problem from an equipment problem. Recording the hold and the release in the same log as the failed result closes the loop for a reviewer.
The failed indicator itself is evidence and should be kept with its packaging until the review closes. A lab that discards the vial and records only the outcome has thrown away the most useful object in the investigation. If the result is confirmed after a retest, the lab also has a clear basis for reporting the event through its own quality process.
What did the lab stop doing?
The lab stopped treating the reprocessing area as a place where stock could sit indefinitely. Indicators are now stored in a closed drawer at room temperature, and the oldest lot is used first. The lab also stopped loading the incubator as soon as vials were ready, because a cold block slows the first hours of incubation and makes results harder to compare across days. Wells are allowed to reach temperature before vials go in.
It stopped relying on memory for the time between processing and incubation. A vials-are-loaded-by marker, written on the cycle sheet, gives the next person a clear point to work from. None of these changes cost money; they removed the small delays and small assumptions that had combined to produce a surprising result.
How do you keep an investigation useful after it closes?
Write the findings down as procedure rather than as a story. The lab turned its conclusions into short rules inside the existing monitoring routine, which is why the fixes survived a staff change a few months later. A finding that lives only in an incident report is easy to lose, while a line in the routine documentation is read again on the next shift.
Review the routine at a fixed point in the year, and check the parts that failed before. If lot rotation, incubator temperature, or the time to incubation were the weak points, those are the fields worth auditing first. An investigation that changes a habit and then verifies the habit is the version that protects the next load.
Ordering for a clinic, a lab, or a care home? Wholesale and multi-site ordering covers case pricing, account setup, and delivery to more than one Canadian site.
Not sure where to start with sterilizer monitoring? CliniEco 24-hour Biological Indicator 5-pack trial ($12.99, ships free).
Related reading
Diagnostic lab supplies · What to do when a spore test fails · Case review of a Winnipeg lab sterilizer qualification
Frequently Asked Questions
Should a lab retest straight away after a spore test fails?
The sterilizer should be held from use, and a repeat test is part of the response, but it should not close the investigation on its own, because the cause often sits in the monitoring routine rather than the load.
Why does an indicator lot matter in a failure investigation?
Knowing which lot was used lets a lab check expiry, storage, and handling for that shipment, and it separates a single bad vial from a problem that could affect every load that used the same lot.
How can an incubator cause a false result?
A well that runs cooler than the others can slow the colour change and make a valid indicator look as though it did not react properly, so well temperature should be confirmed before vials are loaded.
What records make a spore test investigation possible?
A cycle log that links the load, the sterilizer, and the indicator lot, together with the retained failed vial and its packaging, gives a lab enough evidence to find the cause.
CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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