This is a ready-to-use log for reconciling environmental monitoring (EM) media, the control that closes the single most damaging data-integrity gap in EM: the plate that grew, was quietly discarded, and never entered the record. The principle is simple arithmetic that must always balance: plates issued equal plates exposed plus controls plus any documented, justified exclusions. Every plate that leaves the media fridge must trace to a recorded result or a written, approved reason it did not. Replace every <<FILL: ...>> placeholder and route it through your normal document control. Field definitions, instructions, and a filled specimen follow. The rationale is in designing an environmental monitoring program; confirm each cited reference against the current source before you rely on it.
Why reconciliation matters
EM is heavily manual: a technician exposes plates, a microbiologist reads them by eye and records a count. That makes selective recording, a “trial” read redone until it comes out clean, or a grown plate discarded and never logged, both possible and hard to detect after the fact. Reconciliation makes it detectable: if issued does not equal exposed plus controls plus documented exclusions, a plate is unaccounted for, and an unaccounted plate is read by an inspector as possible data manipulation. This log is the evidence that every plate is accounted for.
Log control header
| Field | Entry |
|---|---|
| Log title | EM Plate Issuance and Reconciliation |
| Log / form number | <<FILL: FORM-ID, e.g. FORM-QC-088>> |
| Version | <<FILL: version>> |
| Session / date | <<FILL: monitoring session, date>> |
| Area / grade | <<FILL: room / grade>> |
| Media lot(s) | <<FILL: lot number(s), GP status>> |
| Retention | <<FILL: not less than X; per records retention schedule>> |
Field definitions
| Field | Format | Required | Completed by | When |
|---|---|---|---|---|
| Plate ID | Unique ID / barcode | Yes | Issuer | At issue |
| Media type / lot | Text + lot no. | Yes | Issuer | At issue |
| Growth-promotion status | Pass ref / pending | Yes | QC | Before use |
| Intended site ID | From EM site map | Yes | Issuer | At issue |
| Method | Active air / settle / contact / swab / personnel | Yes | Issuer | At issue |
| Disposition | Exposed / Negative control / Positive control / Excluded | Yes | Technician | At use |
| Exposure start / end (or volume) | Time-time, or L sampled | Yes (viable air/settle) | Technician | At use |
| Exclusion reason (if excluded) | Text + reference | If excluded | Technician + QC | At use |
| Incubation start / end | Date-time | Yes | Analyst | At incubation |
| Result (CFU) | Number, or “no growth” | Yes | Analyst | At read |
| Read by / verified by | Initials, date, time | Yes | Analyst + verifier | At read |
| Plate retained/photographed | Y / N + location | Yes for recoveries | Analyst | At read |
Reconciliation summary (must balance)
| Line | Count |
|---|---|
| A. Plates issued | <<FILL>> |
| B. Plates exposed (samples) | <<FILL>> |
| C. Negative controls | <<FILL>> |
| D. Positive controls | <<FILL>> |
| E. Documented exclusions (breakage, defect, aborted with reason) | <<FILL>> |
| Check: A = B + C + D + E | Balanced? Yes / No |
| Unaccounted plates (must be zero) | <<FILL>> |
| Reconciled by / date | <<FILL>> |
| QA review (if any exclusion or imbalance) | <<FILL>> |
Acceptance criteria
- The reconciliation balances: issued equals exposed plus controls plus documented exclusions, with zero unaccounted plates.
- Every exposed plate has a recorded result (a count or “no growth”), read contemporaneously and attributably.
- Every excluded plate has a written, approved reason (breakage, manufacturing defect, aborted sample with justification), not a bare gap.
- Every recovery has the plate retained or photographed, and a second-person verification at critical sites.
- Growth-promotion status is confirmed for each media lot before use.
- Any imbalance is investigated as a deviation before the session’s data is used.
Filled specimen
An illustrative session for a Grade B fill-suite shift. The numbers are illustrative; replace with your own.
| Plate ID | Method / site | Disposition | Result | Read/verified | Retained |
|---|---|---|---|---|---|
| P-2608-01 | Active air / B-04 | Exposed | No growth | J.O. / S.R. | N/A |
| P-2608-02 | Contact / B-04 wall | Exposed | 1 CFU | J.O. / S.R. | Yes, photo, box 12 |
| P-2608-03 | Personnel / operator gown | Exposed | No growth | J.O. / S.R. | N/A |
| P-2608-04 | Settle / B background | Exposed | No growth | J.O. / S.R. | N/A |
| P-2608-05 | Negative control | Neg control | No growth | J.O. / S.R. | N/A |
| P-2608-06 | Contact / spare | Excluded | Broken on transfer, DEV-2026-0161 | J.O. / S.R. | Fragments retained |
| Reconciliation | Count |
|---|---|
| A. Issued | 6 |
| B. Exposed | 4 |
| C. Negative controls | 1 |
| D. Positive controls | 0 |
| E. Documented exclusions | 1 |
| A = B + C + D + E | 6 = 6, balanced |
| Unaccounted | 0 |
In this example the one recovery was retained and photographed, the one excluded plate carried a deviation reference rather than vanishing, and the arithmetic balances to zero unaccounted. That balance is the entire point: an inspector can confirm no plate quietly disappeared.
Common findings this log prevents
- Plates issued that cannot be tied to a recorded result or a justified exclusion.
- A recovery with no retained plate, so the count can never be re-verified.
- “Trial” reads redone until a clean result appears, with the earlier plates undocumented.
- Media used without a passing growth-promotion record dated before use.
- Counts recorded later from memory rather than contemporaneously and attributably.
References
FDA, Data Integrity and Compliance With Drug CGMP (2018); ALCOA+ expectations. EU GMP Annex 1 (2022) and Annex 11 (for any electronic capture of reads). 21 CFR 211.194 (laboratory records); 21 CFR Part 11 where reads are electronic. USP
<1116>(aseptic environment monitoring; describe, do not paste).
Confirm the current version and clause numbers of each reference before issue.
How to adapt this log
- Set your form number and retention, and align plate IDs to your media barcoding.
- Match the site IDs and methods to your EM site map and sampling plan.
- Point the exclusion and deviation references to your real quality-event procedures.
- Where reads are captured in a LIMS or automated counter, keep this reconciliation as the bridge between issued media and the electronic record, and review the system audit trail alongside it.