When a spore test fails, the first move is to hold the affected loads and check the record before drawing any conclusion, because a failed strip is a finding, not a verdict. The order you work through the next steps decides whether you find a real process problem or spend a week chasing a control error. This article lays out the sequence - quarantine, records, retest, repair verification - and explains where clinics tend to jump ahead.
What should happen in the first hour after a failure?
Stop releasing packs. Quarantine anything processed since the last accepted monitoring result and keep it identifiable, ideally in the same room in a marked container. Re-read the failed strip with the control beside it, and confirm the two were incubated at the same temperature in the same block. Check the cycle log against the batch, then check the consumable batch and its stored conditions. Do not throw the strip away, because the physical evidence is worth more than your memory of it. None of this requires an answer yet; it requires an accurate record of what happened, written while the details are still fresh. Photograph the strip if your procedure allows it, and set the failed batch aside with the day's other consumables so a later review has something to look at.
How do you decide whether a load needs to be recalled?
Recall decisions follow the items, not the calendar. If the failed test was the release criterion for a set of packs that already left the department, those packs are the ones to trace. Work from the cycle number, list where each pack went, and apply your recall procedure. If the test failed on a load still held inside the department, the decision is simpler and you can act before anything is used. A positive control that failed to grow changes the picture, because an invalid batch means the test itself did not run, and the load returns to an unmonitored state rather than a failed one. Write down which of the two situations you are in, because the corrective actions differ. An unmonitored load is not the same as a failed load, and treating the two as one sends a clinic into a recall it may not need.
What does the retest sequence look like?
The retest is meant to answer a specific question, so run it in a defined order rather than repeating the same cycle blindly.
| Step | Action | What it rules in or out |
|---|---|---|
| 1 | Verify control and incubator temperature | Rules out a test-side error |
| 2 | Inspect loading, wrap and chamber | Rules out a penetration or loading fault |
| 3 | Run a second monitored cycle with a fresh BI | Confirms whether the failure repeats |
| 4 | Repeat with a PCD in a test load if it fails again | Locates a machine-level problem |
When does a repeat failure become a service call?
A second failure on the same machine, with a valid control and a fresh batch, is where you stop testing and start diagnosing. Record the two cycle numbers, the readings and everything you changed between them, then call your service provider with that sheet in hand. Working this way keeps the conversation factual and saves a round of guesswork. After any repair, the sterilizer is verified before routine use resumes, and the verification cycle is monitored in the same way as production. The repaired unit is not trusted on the strength of the repair alone, because the point of the retest is to show the process is back where it was. Log the verification cycle in the same place as the production runs so the return to service is visible in the ordinary record.
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Related reading
Autoclave spore test FAQ · Bowie-Dick failure, retest and recall · Sterilization compliance hub · Clinic Starter Bundle
Keeping spare strips on hand? CliniEco 24-hour rapid-readout biological indicators (50-pack) let you retest within the same working day, and the hub above links the rest of the monitoring lines.
Frequently Asked Questions
Should I rerun the load before investigating?
No. Rerunning first can overwrite the evidence. Quarantine, document, then retest as a defined step.
Who decides on a recall?
Follow your written procedure. It should name the person responsible and the records that trigger the decision.
How many retests are reasonable before a service call?
One clean retest resolves most cases. A second failure with a valid control is a machine question, not a testing question.
What if the control grows and the test strip also shows growth?
Treat the batch as a genuine failure. Hold the loads, work the retest sequence, and record both wells on the same line.
Should the failed strip be kept?
Keep it with the batch while the review is open. The physical strip settles questions that memory cannot.
CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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