It's 2:40 on a Thursday afternoon when the reprocessing room phone rings. The 24-hour self-contained biological indicator (BI) from this morning's first load has turned a shade it should never turn — positive. The sterilizer that should have destroyed every spore in that ampoule didn't. That load is sitting in the clean area, and you have to decide what happens next.
Take a breath. A positive BI is serious but manageable when you have a plan — here is the one we walk clinics through.
Biological indicators (24-hour, 25-pack)
Biological indicators (24-hour, 100-pack)
What a Failed Biological Indicator Actually Means
A biological indicator is the closest thing sterilization has to a truth test. Each ampoule carries millions of Geobacillus stearothermophilus spores — far harder to kill than anything in a routine load. A positive result means the sterilizer did not deliver the heat, steam, or contact time needed to destroy those spores. That is a genuine sterilization failure under the standards your program runs on: CSA Z314, ISO 11138, and guidance from Health Canada and the CDC.
Treat it that way — a load you labelled sterile may not have been.
1. Pull the Load and Quarantine Everything
Freeze that load immediately. Every instrument, cassette, and pouch in it is unsterile until proven otherwise. Bag the items, mark them "QUARANTINE — DO NOT USE," and move them somewhere nobody can grab by mistake. Do not reprocess anything yet.
Note which instruments were in the load and cross-check them against the day's schedule — you will need that list for the communication step. Quarantine costs time now and prevents an unsterile instrument reaching a patient.
2. Document the Event in Writing
Record everything while it is fresh: date and time the BI was read, lot number and expiry, cycle number, load contents, cycle parameters, and who caught it. Photograph the positive BI and keep the failed ampoule in a labelled bag.
This record is not bureaucracy. If you need to notify patients, call service, or answer to your regulatory body, that trail reconstructs the event later.
3. Check the Sterilizer Before You Trust It Again
Pull the cycle printout and compare it against what the cycle should have delivered — temperature, pressure, exposure time, dry time. Then inspect the unit — door seals, drain screen, steam line. If it has thermocouples or a calibrated probe, confirm the readings match the display.
Out-of-range readings or a short exposure time point straight at the cause; otherwise look at loading — overpacked trays and tight pouch stacks block steam every time. A fresh roll of CliniEco autoclave tape on every wrap is a quick check that packages went through a cycle.
4. Re-Test with Fresh Biological Indicators
Take the sterilizer out of service and run a test cycle with a fresh BI from the same lot if you have one, plus an unprocessed control. Many clinics run three consecutive empty-chamber cycles before returning a unit to service; follow your manufacturer's instructions and clinic policy.
Only when the test BIs read negative — and the control reads positive, confirming the lot works — should you process a real load, and that load carries its own BI before anything is released. Self-contained indicators make this loop practical — keep CliniEco 24-hour biological indicators on the shelf.
5. Call Service When the Evidence Points That Way
Some failures are operator error; some are the sterilizer telling you it is tired. Call service when cycle parameters fall outside the manufacturer's range, when probe readings disagree with the display, when a second failure follows a clean test cycle, or when inspection shows worn seals or scale.
Hand the technician your documentation — records and photos speed up the diagnosis.
6. Communicate with Staff — and Patients, If Needed
Gather the clinical staff for a huddle. Explain what happened plainly: the BI failed, the load was quarantined, the sterilizer is out of service until testing clears it, and here is what changes in how we load and monitor. Retraining on loading — pouches paper-to-paper, no overcrowding — often follows.
If instruments from the failed load reached patients before you detected the failure, you may need to notify them — consult your public health unit, regulatory body, and legal counsel before drafting any patient communication.
Make the Next Failure a Speed Bump, Not a Crisis
Every clinic that runs BIs will eventually see a positive one. The ones that handle it well have the plan, the habit, and the supplies in place — rapid-readout biological indicators, Class 4 dual-indicator sterilization pouches, and autoclave tape on every wrap. All three live in the CliniEco store.
A positive BI is never good news, but it is not the end of the world. Pull the load, document, investigate, re-test, and communicate — in order, those steps keep your patients, your team, and your sterilizer in safe hands.
Related Reading
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Related reading: see the full sterilization monitoring hub for BI, spore testing and autoclave guides.
deep dive: understand SAL (10⁻⁶) in our sterilization assurance pillar article.
Monitoring your sterilizer? Pick the BI format that matches your workflow.
Ontario dental offices must run a biological indicator every day the sterilizer is used (RCDSO). Choose the readout speed that fits your schedule:
- 24-hour self-contained BIs — 25, 50 and 100-count packs for daily monitoring
- 1-, 3- and 20-minute rapid-readout BIs — same-day release when you cannot wait overnight
- 4-well fluorescence reader — incubates and reads rapid-readout BIs in one bench instrument
Shop 24-hour biological indicators See the 4-well rapid reader
CliniEco Medical · Health Canada MDEL #35334 · Request a wholesale quote
Working in a clinic or care setting? ask a sterilization compliance specialist.
Where to Buy Sterilization Indicators and Spore Tests in Canada
CliniEco Medical supplies chemical indicators, integrating indicators and self-contained biological indicators to clinics, laboratories and care homes across Canada, shipped from Ontario.
| Type | What it confirms | Order |
|---|---|---|
| Class 5 integrating indicator | All critical parameters were met — used inside every pack | Class 5 Integrators, 100-Pack |
| Biological indicator (spore test) | The actual kill — the only test that proves sterilization | 24-Hour, 25-Pack |
| Bowie-Dick test pack | Air removal in pre-vacuum sterilizers only | Bowie-Dick, 6-Pack |
| Indicator tape | External process indicator — the load was processed | Autoclave Tape, 3-Roll Set |
| Not sure which applies? | Run one week in your own workflow first | 24-hour biological indicator, 25 per box |
Round Out Your Sterilization Setup
A biological indicator is one link in the chain — these are the pieces it works with:
- Sterilization roll — 50 m pre-cut sheets for larger instruments
- Constant-heat pouch sealer — 200 °C, 12 mm seal — for consistent pouch closures
Ontario and GTA orders ship free over $99; elsewhere in Canada over $199 ($15 flat below). Bulk and standing orders go through a wholesale account. Print a blank sterilization log sheet from our free generator, or book a sterilization compliance review.
Frequently Asked Questions
What is the first thing to do when a biological indicator fails?
Quarantine the load that ran in the same cycle and label it clearly as not for use. Record the sterilizer, the cycle number, the time and the indicator lot number before anything else is touched.
Can the instruments from that load still be used?
No. Instruments from a failed cycle have not been shown to be sterile. Keep them quarantined and reprocess them through a cycle that passes monitoring before they return to service.
Who needs to be told about a failed indicator?
Begin with your infection control lead and the person responsible for the sterilizer. If instruments from that load were already used on patients, involve the treating clinician and your public health unit for direction on whether anyone needs to be informed.
How should a failed test be recorded?
In the same log as the passing results: date, sterilizer, cycle, indicator lot, the positive result, the action taken and the outcome of the repeat test. An honest record of a failure that was handled correctly is stronger evidence than a gap in the log.
Related reading
- Rapid Readout Biological Indicator Readers: Every Major Brand Compared (2026 Canada Price Guide)
- BI vs Chemical Indicators: What's the Difference in Sterilization Monitoring?
- The Real Annual Cost of Biological Monitoring: Locked Ecosystems vs Open-System BIs in Canadian Dental Clinics
- free Ontario sterilization compliance log
- printable autoclave sterilization log sheet (free)
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