A daily sterilization log is evidence. When a college reviewer or an accreditation surveyor asks how you know each load was processed correctly, the log is the document you hand over. A useful log records the sterilizer, the cycle, the physical parameters, the indicator results and who ran the load, for every day the sterilizer is used. Columns that are missing make the rest of the record far less useful, because a reviewer cannot connect a load to a patient day.
The consumables the log tracks are ordinary ones: autoclave indicator tape for the outside of the pack, Class 4 dual-indicator pouches for packaging, and the daily biological indicator that anchors the assurance record.
Which columns does a complete daily sterilization log need?
Ten columns cover the requirements without turning the page into a two-hour job. The first four identify the load: date, sterilizer identity, cycle number and cycle type. The next three record the physical parameters and the load contents. The final three record the indicator results, the operator and any maintenance note. A single printed row per cycle, initialled at the end of the shift, is enough.
The mistake to avoid is a log that records only the indicator result. A pass mark without a cycle identifier, a temperature and an operator cannot be traced back to anything, and reviewers treat it as a formality rather than a record.
How often must the biological indicator column be filled in?
In Ontario, the RCDSO requires a biological indicator for each sterilizer on every day it is used. That makes the biological indicator column a daily entry rather than an occasional one, and it is the column reviewers ask about first. Where a facility runs three sterilizers, the daily entry applies to each of them separately, so the log needs a row per unit rather than a single row per day.
What should a cycle row capture beyond the date and time?
Cycle type and parameters are the substance of the row. Note whether the cycle was 121 degrees Celsius or 134 degrees Celsius, whether the load was wrapped or unwrapped, the exposure time, and the pressure or cycle number from the sterilizer printout if the unit produces one. Linking the handwritten row to the printout or the sterilizer internal record converts a table into a traceable record, which is what an inspection is really testing. Load contents matter too: knowing that a particular cassette was in the cycle is what allows a clinic to identify affected patients if a failure is later found.
| Column | What to record | Why reviewers check it |
|---|---|---|
| Date | Cycle date, and time if the unit logs it | Ties the load to a service day |
| Sterilizer ID | Unit name and serial number | Shows each unit is monitored separately |
| Cycle number and type | Cycle counter, wrapped or unwrapped, 121 or 134 degrees | Matches the cycle to the printout |
| Parameters | Time, temperature, pressure or cycle printout | Shows the cycle ran to specification |
| Load contents | What was processed | Traceability to patients if a failure appears |
| External indicator | Tape colour change recorded as pass or fail | Confirms the pack saw a cycle |
| Internal indicator | Chemical indicator result per pack | Confirms conditions inside the pack |
| Biological indicator | Lot number, incubator start and read, result | The daily assurance entry |
| Operator | Initials of the person who released the load | Accountability for the release decision |
| Maintenance notes | Faults, retests, out-of-service periods | Shows problems were handled, not hidden |
How long should completed logs be kept?
Retention expectations come from your provincial college and your own facility policy. Many clinics keep at least twelve months on site and longer for loads that contained implants, and store the log where staff can reach it during a visit rather than in a locked office. The low-risk habit is to keep the current year on the bench and archive the previous year in the same place every time, so the record is findable without a search.
Related reading
Two companion articles cover the surrounding requirements: the daily sterilization log checklist for Ontario and how often a spore test is expected in a dental office. The sterilization compliance hub collects the standards and the printable templates behind both.
Frequently Asked Questions
Does a sterilization log need a biological indicator entry every day?
In Ontario, yes, for each sterilizer on every day it is used. That is why the biological indicator column is a daily entry and not an occasional one, and it is the first column a reviewer tends to examine.
Is a handwritten log acceptable, or does it need to be digital?
A handwritten log is acceptable when every row is complete, legible and initialled. Digital logs are easier to archive and search, but the format matters less than whether each row can be traced to a specific load and a specific day.
What happens if a load is missing from the log?
Treat it as a documentation gap and record a note explaining the omission, along with any retest performed. An unexplained gap is more difficult to defend than a gap with a written explanation and a corrective action beside it.
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Download the printable sterilization log sheet, use the log generator to build a clinic-specific template, and ask a sterilization compliance specialist to review a completed log before your next inspection.
CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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