The end of the day is when it happens at most clinics: the last load comes out of the autoclave, and someone remembers the biological indicator still has to go in. It is the easiest task of the day to skip, and one of the most important. Spore testing dental clinics with a biological indicator (BI) is the only way to prove a sterilizer actually killed resistant microorganisms — not just reached a number on a gauge. Ontario's dental regulator expects it on every day the sterilizer is used, and does not treat it as optional.
Biological indicators (24-hour, 25-pack)
Biological indicators (3-hour, 50-pack)
Why Ontario dental standards require daily biological monitoring
Chemical indicators — the stripes that change colour on pouches and tape — show that the right conditions were present: heat, steam, time. They do not show that anything was actually killed. A biological indicator holds live bacterial spores, typically Geobacillus stearothermophilus, which are far harder to destroy than anything found on dental instruments. If the cycle kills those spores, it killed your load. That is why ISO 11138 governs how these indicators are manufactured, and why CSA Z314.8 — the Canadian standard for effective sterilization in health care settings — treats biological monitoring as the core of a sterilization program.
Health Canada and provincial dental colleges take the same position: a dental autoclave monitoring program without regular spore testing is incomplete. In practical terms, that means running a biological indicator for every sterilizer in the office on each day it is used, and for each type of cycle used that day. If you run two autoclaves, each one gets its own test, its own control, and its own log entry.
The daily spore test, step by step
Once you have done it a few times, the whole routine takes about ten minutes of hands-on time plus a 24-hour incubation. This sequence works in most Canadian clinics:
- Place the BI in the hardest-to-sterilize location — usually the front of the chamber on the lower tray, inside a sealed pouch or wrapped cassette, exactly where steam has the toughest time reaching.
- Run a normal cycle with a routine load. Do not run an empty or extended cycle; you want to test what actually happens during real use.
- After the cycle, remove the BI, activate it according to the instructions, and place it in the incubator next to the positive control that came in the pack.
- Read the result at 24 hours. A colour change in the growth medium means spores survived — that is a failed test.
- Record the outcome in your sterilization log with the date, cycle number, operator, and load contents, even when the result is a pass.
What a compliant daily monitoring plan looks like
The Ontario requirement is wider than "test once a day". The frequency is one biological indicator for each sterilizer on each day it is used, and once for each type of cycle used that day, with a control processed alongside it. Set out as a table, the gaps become visible.
| What you monitor | Frequency | Cycle types | What goes in the record |
|---|---|---|---|
| Routine sterilizer use | Each day the sterilizer is used | Each type of cycle used that day | Date, sterilizer and load or cycle number, indicator lot, result, and the person who ran the test |
| Control indicator | With every monitoring run | Same cycle type as the test indicator | Control result and the incubation start time |
| Implantable loads | Every load containing implantable devices | That cycle | Indicator result before release; implants stay quarantined until the result is known |
| A positive result | Immediately, until it is resolved | Repeat in the same cycle type | Investigation, corrective action and the re-test result |
| The log itself | Continuous | All cycles | Kept at least 10 years from the last entry in Ontario |
Sources checked 2026-10-01: the college's infection prevention and control standard (biological monitoring section) and the provincial guidance for cleaning, disinfection and sterilization in health care settings, which states the same each-day, each-cycle-type rule for biological monitoring.
When a spore test comes back positive
A positive result is not the end of the world, but it is a stop-everything moment. Everything from that cycle is considered non-sterile until proven otherwise. This is the sequence we walk clinics through:
- Isolate everything from the failed cycle. Do not return it to circulation, and do not reprocess it in the same machine until you understand what happened.
- Retest the sterilizer right away, ideally with a fresh biological indicator from a different lot.
- Look for root causes: overloading, poor steam quality, a worn door gasket, pouches sealed incorrectly, or a chamber that has not been cleaned in months.
- Notify the team and your sterilizer service provider, and document every step. The CDC Guidelines for Infection Control in Dental Health-Care Settings expect a written record of the investigation, and so do most provincial colleges.
Record keeping that stands up to an audit
CDC guidance is blunt on this point: if it was not documented, it did not happen. For dental autoclave monitoring, that means a log entry for every cycle, including the daily biological indicator. Record the BI result, the lot number of the indicator, the incubator reading, and the name of the person who ran the test. Canadian dental colleges typically ask practices to keep sterilization records for a defined period — check your provincial requirement and hold on to the logs longer than you think you need to.
What an Ontario audit actually asks for
The college's infection prevention and control self-audit form counts twenty record fields across four groups: nine in the load log, five on the package label, three in the service and maintenance log, and three in the malfunction record. Documenting all four is what turns a daily routine into evidence.
| Record group | Fields the audit looks for | Where it lives |
|---|---|---|
| Load log | Date; sterilizer number; load number; load contents; cycle; sterilization time; temperature; pressure; name of the person responsible | Reprocessing logbook kept beside the sterilizer |
| Package label | Date; sterilizer used; load or cycle number; contents when not visible; initials of the person responsible | On each pack, next to the indicator |
| Service and maintenance log | Three fields covering the sterilizer's servicing | Maintenance file |
| Malfunction record | Three fields covering each malfunction episode | Incident file |
| Two rules outside the field count | The logbook carries physical, chemical and biological results together, and is retained for ten years after the last entry | Same logbook |
Two details sit outside the numbered fields but decide how an audit feels: the incubator reading for each test, and the date the result was read. Recording both takes a few seconds and shortens any later review. Clinics that reach daily monitoring across two or more sterilizers usually step up to a bulk self-contained indicator pack rather than re-ordering small boxes every fortnight.
Why autoclaves fail spore tests (and how to avoid it)
- Overloading. When pouches are packed too tightly, steam cannot sweep past every surface, and trapped air protects the spores.
- Steam quality. Wet steam, low pressure, or a chamber that does not purge air fully will fail a BI even on a light load.
- Sealing and packaging. Pouches taped shut, torn paper, or instruments crammed past the seal line defeat the entire cycle.
- Skipped maintenance. A sterilizer that is never cleaned or serviced will eventually fail, and the spore test is usually the first sign.
None of this requires exotic equipment. A 24-hour self-contained biological indicator, a small incubator, and a logbook are the whole kit. CliniEco's biological indicator pack gives you ten tests with controls — about two weeks of daily testing for one autoclave — and the 24-hour readout means you know the result before Monday's patients arrive. Pair it with CliniEco's class 4 sterilization pouches (ISO 11140-1 class 4 chemical indicators) and autoclave tape so your packaging is never the reason a good cycle fails. Compared to Medicom's or 3M's equivalent kits, the routine is identical — same incubation window, same controls — and switching brands does not change your protocol.
How Often to Do Spore Test in Dental Office RCDSO
Every day the sterilizer is used. In Ontario, the RCDSO infection prevention and control standard requires a biological indicator in a process challenge device on each day the sterilizer is operated, and for each type of cycle used. Weekly testing is the United States CDC / AAMI ST79 baseline, not the Ontario requirement. Plan roughly 250 indicators per sterilizer per year on a five-day week.
Related reading: browse the dental compliance hub for more clinic-ready sterilization guides.
Related: Never re-order sterilization supplies again — monthly plan from $69/month.
read our dental sterilization monitoring compliance pillar for RCDSO rules.
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
Spore test, spore check or biological indicator: which one is it?
Ask five people in a dental office to name the daily monitoring step and you get five answers: spore test, spore check, biological monitoring, BI, and whatever brand name is printed on the box. They all point at the same vial in the same sterilizer. The table below maps the wording clinics use — and search for — onto the object, the frequency and the record behind it.
| Term | What it means in a dental office | What it does not cover | What the routine uses |
|---|---|---|---|
| Spore test | The daily biological run: live spores processed inside a normal load, then incubated | Temperature, pressure and packaging are not measured here | One self-contained indicator per sterilizer per day used |
| Spore test for autoclave | The same test named by the equipment; the sterilizer is the unit that gets tested | A result from one unit says nothing about the second autoclave in the room | One indicator, one control and one log line per machine |
| Spore test autoclave | Word-order variant of the same phrase; the answer does not change | Not a second product and not a different frequency | Same pack, same incubator, same log column |
| Autoclave spore test | Wording used when the test is scheduled as an autoclave task on a checklist | Not a maintenance visit; a service call never replaces the daily indicator | Test indicator plus a positive control from the same pack |
| Biological spore testing autoclave | Regulatory phrasing for the program, not for one vial | Not an outside audit; it is the clinic's own daily record | A pack sized to weekly volume, plus the incubator |
| Spore check autoclave | Front-desk shorthand for the daily check; "check" refers to reading and recording as much as processing | Not a glance at the stripe on a pouch | Indicator, incubator, and a log entry with the lot number |
| Biological indicators | The product category: spore carriers in a vial of growth medium | Not the same thing as a chemical indicator, even when both get called "indicators" | Self-contained indicators in 24-hour or rapid-readout format |
| Incubator for biological indicator | The bench device that holds the vial at its labelled incubation temperature for the full read time | A warm room, a drawer or a general-purpose lab incubator without a calibrated block | A dry-block incubator matched to the vial format you buy |
| Attest 1292 | A catalogue number clinics type when reordering one brand of rapid-readout steam indicator | The number does not tell you the daily frequency your college expects | That brand's reader, or any ISO 11138-3 indicator whose read time fits your schedule |
| Chemical indicator | Stripe, tape or integrating strip that changes colour when cycle conditions were met | Whether spores died — only a biological indicator answers that | Class 4 pouches or Class 5 integrators, alongside the daily indicator |
| Spore testing for dental clinics | The whole program: indicator, control, incubator, log and retention period | Not a one-off test run before an inspection | Indicator pack, incubator, log sheet, and a retention rule you can defend |
Is a spore check the same thing as a spore test?
Yes as a test, no as a word. In practice a "spore check" is the whole loop: process the indicator in a normal load, incubate it beside the control, read it at the labelled time, then write the result into the log. A check that stops at reading the vial without a log entry is the version that fails an audit, because the college's record review asks for the date, the sterilizer, the lot number and the result — not for a memory of having done it.
What is inside a biological indicator, and why does the organism matter?
A self-contained indicator holds a carrier inoculated with Geobacillus stearothermophilus spores, plus a glass ampoule of growth medium that you crush after the cycle. The organism is chosen because it resists moist heat far better than the vegetative bacteria left on instruments — so if the cycle kills it, the load is sterile by a wide margin. Steam indicators are made to ISO 11138-3, which sets the organism, the spore count and the resistance the manufacturer has to declare on the pack.
Can a chemical indicator be used instead of a spore test?
No. A chemical indicator answers a different question: were the conditions of the cycle present in that pack. It cannot show that anything was killed, which is why a stripe change and a passing biological indicator are both recorded, on the same log page, for the same load. Treating a colour change as a substitute is the single most common monitoring gap we see; the fix is cheap, because the indicator you already run sits next to the pouch instead of replacing the vial.
Which incubator does a biological indicator need?
One that holds the temperature printed on the indicator's own instructions for the whole read time, with wells sized to the vial you buy. That is why clinics use a dry-block incubator rather than a shelf in a general lab incubator: the block keeps every vial at the same set point, and the read time stops depending on where the vial was placed. Rapid-readout formats add one more requirement — they are read on the matching fluorescence reader, not by eye.
What is Attest 1292, and what does it take to read one?
Attest 1292 is one brand's rapid-readout steam indicator: a self-contained vial with a spore strip and a glass ampoule, read on that brand's auto-reader, which holds the vials at its own incubation temperature and reads fluorescence. If the number on the box is the only thing you know, check two details before ordering anything: the read time, and whether you own a reader that accepts that vial format. A 24-hour self-contained indicator, 25 pack needs nothing more than a dry-block incubator, which is why it stays the default for a single-surgery practice.
What does a biological spore testing program for an autoclave include?
Five parts, and dropping any one of them is what an inspection finds: an indicator for each sterilizer on each day it is used and for each type of cycle run that day; a positive control processed with every run; an incubator that holds the labelled temperature; a log carrying date, sterilizer, lot, result and the person who read it; and a retention period long enough to cover a records review — ten years from the last entry in Ontario. A five-day week works out to roughly 250 indicators per sterilizer per year.
Which spore testing guide answers the next question?
Frequency is settled above; the three questions that follow it have their own guides. Spore testing frequency in Canada versus the United States sets the RCDSO daily rule against the CDC and AAMI weekly baseline. After a failed spore test covers quarantine, retest and release. What a year of daily spore testing costs in Canada turns the 250-indicator figure into a budget line, and the Ontario ordering case review shows how lead times change that plan. If you are choosing the device rather than the routine, the 24-hour dry-block incubator is the piece the rest of the program hangs on.
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
How Often to Do Spore Test in Dental Office RCDSO
In Ontario, follow the RCDSO: run a biological indicator for each sterilizer on every day the sterilizer is used, not once a week. A clinic that runs five days a week therefore needs roughly five indicators per sterilizer per week, about 250 a year. Test every cycle type you run, not only the standard load, and record each result the day it is read. The weekly baseline belongs to the CDC and AAMI ST79 in the United States; it does not satisfy the Ontario college requirement.
What counts as a spore test for RCDSO purposes?
Only a biological indicator counts. A self-contained vial of Geobacillus stearothermophilus spores, manufactured to ISO 11138-3, is processed inside a process challenge device in a normally loaded cycle, then incubated and read. Autoclave tape, external chemical indicators, and Class 5 or Class 6 strips show that cycle conditions were met, but they cannot prove the spores died. Keep the incubator log beside the sterilizer so a positive result is caught the day it appears.
Last updated: September 2026
Have a question about your own facility? Send it in and you will get a written answer specific to your setup, with the regulation or standard it is based on cited. Ask your compliance question.
Monitoring is only as strong as the log that captures it. The free, sector-specific self-check covers the records and checks an inspector is most likely to look for; it takes about two minutes, prints out, and needs no sign-up.
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
- dental clinic sterilization supplies
- free Ontario sterilization compliance log
- printable autoclave sterilization log sheet (free)
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