This is a ready-to-use excursion investigation form. Open it whenever a viable result crosses an action level, when anything grows in Grade A, or when a non-viable count exceeds its limit. Replace every <<FILL: ...>> placeholder with your own specifics. A worked filled specimen follows the template. The discipline this form enforces is the same one inspectors look for: confirm the result is real before you explain it away, name the organism, hold the product, fix the source, and verify the fix held.
Document control header
| Field | Entry |
|---|---|
| Form title | Environmental Monitoring Excursion Investigation |
| Form number | <<FILL: FORM-ID, e.g. FRM-QC-031-02>> |
| Linked SOP | <<FILL: SOP-ID for EM excursion investigation>> |
| Deviation / record number | <<FILL: DEV/INV number>> |
| Version | <<FILL: version>> |
1. Excursion identification
| Field | Entry |
|---|---|
| Date and time excursion detected | <<FILL>> |
| Detected by (name, role) | <<FILL>> |
| Suite / room and grade | <<FILL: room ID and grade>> |
| Site ID (from EM map) | <<FILL>> |
| Method | Active air / Settle plate / Contact / Swab / Personnel / Non-viable |
| Result | <<FILL: CFU and units, or particle count>> |
| Alert level / action level / regulatory limit | <<FILL>> / <<FILL>> / <<FILL>> |
| Excursion type | Action level exceeded / Any Grade A recovery / Non-viable limit exceeded / Alert trend |
| Operation in progress at detection | <<FILL: e.g. fill of batch ID, at rest, cleaning>> |
| Media lot and growth promotion record | <<FILL: lot / GP record ID>> |
| Plate retained and photographed (Yes/No) | <<FILL>> (must be Yes before disposal) |
2. Immediate actions (Day 0)
Record what was done on detection, before any disposition.
- Plate retained and photographed; not discarded.
<<FILL: confirm + storage location>> - Deviation opened under
<<FILL: SOP-ID for deviation management>>. Number:<<FILL>> - Product or units exposed in the window provisionally identified and placed on hold pending impact assessment.
<<FILL: batch/units and hold status>> - EM program owner and QA notified the same working day.
<<FILL: who, when>> - Enhanced sampling at the affected site initiated where appropriate.
<<FILL>>
3. Confirm the result is real
Rule out laboratory error with objective evidence. The default is that the count is real until evidence shows otherwise. A result must not be invalidated because it is inconvenient.
| Check | Finding |
|---|---|
| Negative control for the session clean? | <<FILL: yes / no>> |
| Same-lot plates from the session normal? | <<FILL>> |
| Media lot growth promotion passing and dated before use? | <<FILL>> |
| Handling, transport, and incubation reviewed for contamination opportunity? | <<FILL>> |
| Reader and second-person verification consistent? | <<FILL>> |
| Objective evidence of a specific lab error (Yes/No)? | <<FILL>> |
| Disposition | Result confirmed real / Invalidated with documented evidence (state evidence) |
If invalidated, the specific objective evidence must be stated here, not a generic “probable lab error”: <<FILL: evidence or "result confirmed real">>
4. Organism identification
| Field | Entry |
|---|---|
| Number of colonies / isolates | <<FILL>> |
| Identification method | <<FILL: e.g. MALDI-TOF, 16S rRNA sequencing, phenotypic system>> |
| Genus / species | <<FILL>> |
| Likely source class | People (Staphylococcus, Micrococcus) / Ingress or materials (mold, Bacillus) / Water or wet surface (Gram-negative) / Other |
| Already in house-flora library (Yes/No) | <<FILL>> |
| Identification record reference | <<FILL>> |
Identification is required for any recovery in a critical zone and for recoveries above the defined threshold elsewhere. “1 CFU, not identified, discarded” is not an acceptable closure for a critical-zone recovery, because the source can then never be known.
5. Product and batch impact assessment
| Field | Entry |
|---|---|
| Product / batch(es) potentially affected | <<FILL>> |
| Proximity of site to exposed product | <<FILL: e.g. settle plate at open-product fill point>> |
| Units exposed during the excursion window | <<FILL: count or description>> |
| Concurrent media fill / intervention data reviewed | <<FILL>> |
| Concurrent EM (other streams, same operation) reviewed | <<FILL: viable air, surface, personnel, non-viable>> |
| Sterility risk to the batch | <<FILL: assessment>> |
| Disposition input to batch decision | <<FILL: hold, release pending, reject, escalate to QA>> |
The batch impact is one input into a holistic decision made under <<FILL: SOP-ID for batch disposition>>, not a standalone pass or fail. Affected product stays on hold until the assessment is complete.
6. Root cause and CAPA
| Field | Entry |
|---|---|
| Root cause method used | <<FILL: e.g. 5 Whys, fishbone, fault tree>> |
| Root cause statement | <<FILL>> |
| Contributing factors | <<FILL>> |
| Correction (immediate) | <<FILL>> |
| Corrective action (prevent recurrence) | <<FILL>> |
| Preventive action (related sites/processes) | <<FILL>> |
| CAPA reference(s) | <<FILL: CAPA number(s)>> |
| Site map / SOP changes triggered | <<FILL: e.g. add gasket to contact-plate map and PM>> |
7. Effectiveness verification (enhanced monitoring)
| Field | Entry |
|---|---|
| Enhanced monitoring plan (site, method, frequency, duration) | <<FILL>> |
| Results during enhanced period | <<FILL>> |
| Recovery returned to baseline (Yes/No) | <<FILL>> |
| Isolate added to house-flora library and disinfectant challenge panel (Yes/No) | <<FILL>> |
| Verification conclusion | <<FILL: fix held / not held, re-open>> |
8. Closure
| Field | Entry |
|---|---|
| Investigation summary | <<FILL>> |
| Investigator (name, signature, date) | <<FILL>> |
| QC micro lead review (name, signature, date) | <<FILL>> |
| QA approval and batch decision (name, signature, date) | <<FILL>> |
| Deviation closed (date) | <<FILL>> |
9. References
EU GMP Annex 1, Manufacture of Sterile Medicinal Products (excursion handling, Grade A any-recovery expectation, link to CCS). FDA Guidance for Industry, Sterile Drug Products Produced by Aseptic Processing, Current Good Manufacturing Practice. 21 CFR 211.113 (control of microbiological contamination) and 211.192 (Production record review), which mandates investigation of any unexplained discrepancy or failure of a batch to meet specifications. USP <1116> Microbiological Control and Monitoring of Aseptic Processing Environments. ICH Q9, Quality Risk Management (impact assessment and risk-based disposition).
Confirm the current version and clause numbers before issue.
Filled specimen
The following shows the form completed for an example Grade A recovery, so you can see the level of detail an inspector expects. The company, organism, and numbers are illustrative; replace them with your own.
1. Excursion identification. Detected 2026-06-15 15:40 by M. Okafor (EM operator). Fill suite FS-2, Grade A critical zone. Site A-01, needle/fill point. Method: settle plate. Result: 2 CFU per plate. Alert/action/limit for Grade A: any recovery is an excursion. Operation in progress: fill of batch BX-2606-014. Media lot TSA-2604, GP record GP-2026-088. Plate retained and photographed: Yes, stored in micro lab fridge R-3.
2. Immediate actions (Day 0). Plate retained and photographed. Deviation DEV-2026-0211 opened. Units filled during the exposure window (units 410 to 612) placed on hold. EM owner (L. Romano) and QA (P. Vance) notified 2026-06-15 16:05. Enhanced sampling at A-01 initiated for the next runs.
3. Confirm the result is real. Negative control clean; same-lot plates from the session normal; GP record passing and dated 2026-06-01, before use; handling and incubation reviewed, no contamination opportunity identified; reader and second-person verification consistent at 2 colonies. Objective evidence of a specific lab error: No. Disposition: result confirmed real.
4. Organism identification. 2 isolates. Method: MALDI-TOF, confirmed by sequencing. Identified as a mold, Aspergillus species. Likely source class: ingress or materials. Already in house-flora library: No (new). ID record IDR-2026-077.
5. Product and batch impact assessment. Batch BX-2606-014 potentially affected. Settle plate sat at the open-product fill point. Units 410 to 612 exposed in the window. Concurrent media fill history and the intervention log reviewed; concurrent active-air and personnel results for the same fill were zero. Sterility risk to the batch judged credible for the exposed units given proximity and a mold recovery. Disposition input: hold all exposed units, escalate batch decision to QA.
6. Root cause and CAPA. Method: fishbone plus 5 Whys. Root cause: a degraded door gasket near the fill line allowed unfiltered ingress, consistent with a mold recovery. Contributing factor: gasket not on the preventive maintenance list and not on the EM contact map. Correction: gasket replaced. Corrective action: gasket added to PM and to the EM contact-plate map. Preventive action: all suite door gaskets surveyed and added to PM. CAPA-2026-0098. Site map updated to add contact site for the door gasket.
7. Effectiveness verification. Enhanced monitoring at A-01 and the new gasket site, settle plus contact, each fill for 4 weeks. Results: all zero. Recovery returned to baseline: Yes. Isolate added to the house-flora library and disinfectant challenge panel: Yes. Verification conclusion: fix held.
8. Closure. Summary: a real Grade A mold recovery driven by a degraded door gasket allowing ingress; exposed units of BX-2606-014 rejected on a holistic risk assessment; gasket replaced and added to PM and EM; enhanced monitoring confirmed the fix. Investigator R. Singh, signed 2026-07-08. QC micro lead L. Romano, signed 2026-07-09. QA P. Vance, signed 2026-07-10, batch decision: reject exposed units, release remainder on full risk assessment. Deviation closed 2026-07-10.
What carried this investigation was the organism identity (a mold pointed at ingress, not at people), a confirmed real result, a real source, a verified fix, and a documented batch decision. “Probable lab error, no action” would not have survived a second look.
Common inspection findings this form prevents
- An EM result invalidated as “lab error” with no objective evidence, the most heavily criticized practice in this domain.
- A critical-zone recovery recorded as “1 CFU” and discarded without identification, so the source can never be known and trends by organism are impossible.
- Identification shopping, re-running an isolate ID until a less alarming result appears.
- A Grade A recovery treated as noise rather than as an event with a deviation, an impact assessment, and a hold.
- Product released before the impact assessment was complete.
- A root cause that names no source and an excursion closed with no verification that the correction held.
How to adapt this form
- Set your form number and link it to your EM excursion SOP and deviation system in the header.
- Point the cross-references in sections 2, 5, and 6 to your real deviation, batch disposition, and CAPA procedures.
- State your own identification thresholds (when a recovery must be identified) and your enhanced-monitoring defaults.
- If you use an electronic deviation or LIMS system, attach this form or replicate its fields, and keep the retained-plate photograph linked to the record.
- Confirm every regulation in section 9 against the current published version before issue.