This is a ready-to-use performance qualification protocol for a moist heat sterilization cycle. It is approved before execution and its results are summarized in a validation report. Replace every <<FILL: ...>> placeholder with your own specifics, set your document numbers and dates, and route it through your normal document control, review, and approval. A worked filled specimen of the key test cases follows the template. Verify each cited standard and regulation against the current source before you rely on it, and confirm every acceptance threshold against your own approved sterilization approach.
Approval page
| Role | Name | Signature | Date |
|---|---|---|---|
| Author (validation / qualification engineer) | <<FILL>> | ||
| Microbiology / sterility assurance SME | <<FILL>> | ||
| Process / manufacturing owner | <<FILL>> | ||
| Engineering / facilities | <<FILL>> | ||
| Quality Assurance (approval to execute) | <<FILL>> |
| Field | Entry |
|---|---|
| Protocol number | <<FILL: PQ-ID, e.g. PQ-STE-021>> |
| Version | <<FILL: version>> |
| Sterilizer ID | <<FILL: autoclave asset number>> |
| Cycle name / number | <<FILL: routine cycle identifier>> |
1. Objective
To demonstrate, with documented physical and biological evidence, that the defined moist heat cycle delivers the required lethality to the slowest-heating location of each worst-case load configuration, achieving the target Sterility Assurance Level with reproducibility across three consecutive successful runs per study.
2. Scope
| Field | Entry |
|---|---|
| Sterilizer and cycle type | <<FILL: e.g. pre-vacuum porous load / gravity / liquid air-overpressure>> |
| Sterilization approach | <<FILL: overkill / bioburden / bioburden-BI hybrid, with rationale reference>> |
| Target SAL | <<FILL: 10^-6 for product contact, or justified alternative>> |
| Load configurations in scope | <<FILL: maximum load, minimum load, any mixed loads>> |
| Out of scope | <<FILL: cycles, loads, or products not covered>> |
3. System description
Describe the sterilizer, its control system, chamber dimensions, steam supply, and the routine cycle parameters (temperature set point, exposure time, ramp, dwell, and for liquids the counter-pressure profile). Reference the IQ/OQ that established the qualified state and the steam quality qualification.
4. Prerequisites
| # | Prerequisite | Reference | Verified (initial / date) |
|---|---|---|---|
| 4.1 | IQ and OQ complete and approved | <<FILL>> | |
| 4.2 | Steam quality qualified (dryness, superheat, non-condensable gases) | <<FILL>> | |
| 4.3 | Study thermocouples and data loggers calibrated against a traceable standard (pre-study) | <<FILL>> | |
| 4.4 | Biological indicators sourced with lot certificate (population and D-value) | <<FILL: BI lot, N0, D121>> | |
| 4.5 | Load configurations defined, with photographs / diagrams | <<FILL>> | |
| 4.6 | Bioburden data available (mandatory for bioburden cycles) | <<FILL>> | |
| 4.7 | Cycle developed and OQ-confirmed at setpoint | <<FILL>> |
5. Roles
| Role | Responsibility |
|---|---|
| Validation engineer | Executes runs, places probes and BIs per plan, calculates F0, records results |
| Microbiology SME | Sets organism, BI, SAL and log-reduction targets; interprets BI recovery; defines incubation |
| Metrology | Calibrates thermocouples and reference standards before and after the campaign |
| Engineering | Owns sterilizer, steam supply, and preventive maintenance during the study |
| QA | Approves the protocol and results; owns deviation handling and cycle release |
6. Acceptance criteria
Confirm each threshold against your approved approach before execution; the values below are common defaults, not universal law.
| # | Study | Acceptance criterion |
|---|---|---|
| AC-1 | Empty-chamber distribution | All distribution thermocouples within <<FILL: e.g. +/- 1 degC>> of the mean during exposure; no probe below the lower control limit; drain characterized; reproducible over three runs |
| AC-2 | Loaded distribution | Uniformity maintained around the load within the same band |
| AC-3 | Heat penetration | Minimum delivered F0 at the load cold spot >= <<FILL: design target, e.g. 12 min overkill>>; cold-spot temperature reaches and holds set point for the required time; equilibration time within <<FILL: limit>> |
| AC-4 | BI half-cycle (overkill) | All BIs (>= 10^6 resistant spores) completely inactivated after half the intended exposure time, across three consecutive runs |
| AC-5 | Full-cycle confirmation | All BIs inactivated; physical F0 and biological F0 consistent; controls valid |
| AC-6 | Controls | Positive control grows; negative control remains sterile, every run |
| AC-7 | Sensors | All study thermocouples within calibration drift limit post-study (<<FILL: e.g. +/- 0.5 degC>>); any out-of-limit probe’s data excluded and impact assessed |
| AC-8 | Worst case bracketed | Each routine load configuration is represented by a validated worst case |
7. Test cases
TC-1: Empty-chamber heat distribution
| Field | Entry |
|---|---|
| Step | Distribute <<FILL: number>> calibrated thermocouples throughout the empty chamber plus the drain and reference; run the cycle; repeat for three runs |
| Expected | AC-1 met |
| Actual | <<FILL>> |
| Pass / Fail | <<FILL>> |
| Tester / Date | <<FILL>> |
TC-2: Loaded heat distribution and heat penetration
| Field | Entry |
|---|---|
| Step | Configure the worst-case load; place distribution probes around the goods and penetration probes inside the items at the hardest-to-heat points, each paired with a co-located BI; run three consecutive cycles |
| Expected | AC-2, AC-3 met; co-located BIs inactivated in the full cycle |
| Actual (F0 at cold spot, per run) | <<FILL>> |
| Pass / Fail | <<FILL>> |
| Tester / Date | <<FILL>> |
TC-3: Biological indicator half-cycle (overkill)
| Field | Entry |
|---|---|
| Step | Place BIs (>= 10^6, known D121) at worst-case and representative locations; run the sterilizer at half the intended exposure time, all other parameters held; incubate recovered BIs with positive and negative controls; repeat three consecutive runs |
| Expected | AC-4, AC-6 met (all half-cycle BIs show no growth; positive control grows) |
| Actual | <<FILL>> |
| Pass / Fail | <<FILL>> |
| Tester / Date | <<FILL>> |
TC-4: Full-cycle confirmation and F0 reconciliation
| Field | Entry |
|---|---|
| Step | Run the routine cycle with BIs and thermocouples at the cold spot; compute physical F0 from the cold-spot probe; compare to the biological F0 implied by the BI kill |
| Expected | AC-3, AC-5, AC-6 met; physical and biological lethality consistent |
| Actual | <<FILL>> |
| Pass / Fail | <<FILL>> |
| Tester / Date | <<FILL>> |
TC-5: Minimum / alternate load configuration
| Field | Entry |
|---|---|
| Step | Repeat penetration and BI challenge for the minimum load (and any other routine pattern) |
| Expected | AC-3, AC-4, AC-8 met |
| Actual | <<FILL>> |
| Pass / Fail | <<FILL>> |
| Tester / Date | <<FILL>> |
8. Deviation handling
Any result outside acceptance, any probe failing post-study calibration, or any invalid control is recorded as a deviation, investigated for root cause and impact, and dispositioned before the cycle is released. A failed positive control invalidates the affected run. Reference <<FILL: deviation SOP number>>.
9. Summary and conclusion
State whether each acceptance criterion was met, list deviations and their disposition, and conclude whether the cycle is qualified for routine use for the load configurations tested. Route the summary for QA approval and cycle release.
| Field | Entry |
|---|---|
| All acceptance criteria met | <<FILL: Yes / No>> |
| Deviations and disposition | <<FILL>> |
| Cycle qualified for routine use | <<FILL: Yes / No, for which loads>> |
| Routine release basis (parametric or BI) | <<FILL>> |
| Requalification interval | <<FILL>> |
10. References
21 CFR 211.113(b) (validation of sterilization processes); 21 CFR 211 cGMP. EU GMP Annex 1, Manufacture of Sterile Medicinal Products (2022 revision). ISO 17665, Sterilization of health care products, Moist heat (process development, validation, routine control). EN 285 (large steam sterilizers) and EN 13060 (small sterilizers); steam quality tests. USP <1229>, <1229.1>, <1229.2>, <1229.5>; <55>, <1035>, <1211>. ISO 11138 series (biological indicators); ISO 11139 (vocabulary: D-value, z-value, SAL, F0).
Describe copyrighted standards in your own words; do not paste their clauses. Confirm the current edition and clause numbers before issue.
11. Attachments
Probe and BI placement diagrams and photographs; calibration certificates (pre and post); BI lot certificate; raw thermal data and F0 calculations; load configuration definitions; deviation records.
Filled specimen
Selected test cases completed for an example pre-vacuum porous-load cycle, 121 °C for 30 min intended exposure, overkill approach, BI D₁₂₁ = 1.8 min, N₀ = 1.2 × 10⁶.
TC-2 (heat penetration, maximum load), F0 at the pack-center cold spot:
| Run | Cold-spot F0 (min) | Equilibration (min) | Co-located BI (full cycle) | Pass/Fail |
|---|---|---|---|---|
| 1 | 18.4 | 2.1 | No growth | Pass |
| 2 | 17.9 | 2.3 | No growth | Pass |
| 3 | 18.6 | 2.0 | No growth | Pass |
All three runs exceed the ≥ 12 min overkill target with margin.
TC-3 (BI half-cycle, 15 min exposure):
| Run | BIs placed | BIs positive (growth) | Positive control | Negative control | Pass/Fail |
|---|---|---|---|---|---|
| 1 | 20 | 0 | Growth | Sterile | Pass |
| 2 | 20 | 0 | Growth | Sterile | Pass |
| 3 | 20 | 0 | Growth | Sterile | Pass |
Complete kill of ≥ 10⁶ spores at half cycle across three runs demonstrates the full cycle delivers at least 12 logs of reduction. Physical F0 at the cold spot (TC-4) reconciled with the biological result. Conclusion: cycle qualified for routine use for the maximum and minimum porous loads tested; routine release by parametric criteria with BI monitoring retained as additional assurance; requalification annually and on change.
Common inspection findings this protocol prevents
- A routine load configuration run in production that was never in the penetration matrix.
- Penetration probes placed in easy-to-heat spots rather than the true cold spot.
- F0 taken from the chamber or drain probe instead of the load cold spot.
- A half cycle “passed” on a non-viable BI lot because the positive control was omitted or ignored.
- Thermocouples not calibrated after the study, so drift went undetected.
How to adapt this protocol
- Set the sterilization approach (overkill, bioburden, or hybrid) and let it drive the F0 target and the BI challenge design.
- Define every routine load as a worst case and bracket it; never run a production pattern you did not validate.
- Confirm every acceptance threshold against your approved approach and the current standard editions.
- Plan more thermocouples than the minimum so one post-run calibration failure does not sink a run.
- Reconcile physical F0 (from the cold spot) against biological F0 (from BI kill); agreement is your strongest evidence.