You have received a thermal mapping report. It is thick — perhaps 30 to 80 pages, with graphs, tables, floor plan diagrams, and multiple attachments. The QA manager who commissioned it has signed off. The filing system needs it by end of week.
But before it goes into the file, someone needs to answer the most important question: is this report actually good?
In the Philippines, this question is asked too rarely before thermal mapping reports enter the compliance file. A report that looks professional — with a corporate cover page, colourful temperature graphs, and a table of sensor positions — may nonetheless be fundamentally deficient: missing a pre-approved protocol, using data loggers calibrated by a non-PAB-accredited provider, failing to conduct seasonal mapping, or drawing compliance conclusions from a study conducted under cool December conditions for a facility that needs summer qualification.
When the report is filed without review, these deficiencies become your problem — not the mapping provider’s. When an FDA inspector asks to see your thermal mapping documentation, or when a multinational pharmaceutical principal conducts a distributor qualification audit, or when a BRCGS auditor reviews your HACCP temperature CCP verification records, a deficient report in the compliance file is a deficient compliance file.
This guide gives Philippine QA managers the knowledge to assess a thermal mapping report critically — not as a technical expert in measurement science, but as the person responsible for deciding whether the report is fit for its intended compliance purpose. It covers every section of a compliant thermal mapping report, explains what each section must contain and why, provides a practical review checklist, and identifies the most common deficiencies found in Philippine thermal mapping reports that QA managers should catch before filing.
| The QA Manager’s Job When Reviewing a Thermal Mapping ReportYour job is not to verify the mathematics of the temperature analysis or to second-guess the sensor placement strategy. Those are the mapping provider’s technical responsibilities.Your job is to verify that: the report is complete (all required sections are present), the study was conducted correctly (pre-approved protocol, PAB-accredited calibration, seasonal conditions), and the conclusions are logically supported by the data presented.If any of these three conditions is not met, the report needs correction before it enters the compliance file. A signed approval of a deficient report transfers responsibility for that deficiency to the approving QA manager. |
1. The Structure of a Compliant Thermal Mapping Report
A WHO TRS 961 Supplement 8, GMP, and FDA Circular 2021-003 compliant thermal mapping report follows a defined structure. The sections and their required content are described below. Review each section systematically — not just the compliance conclusion at the end.
Section 1: Report Cover Page and Identification
The cover page establishes the basic identity and document control status of the report. Check for:
- Report title: Must identify the study type (OQ, PQ, seasonal requalification), the storage area (cold room designation, warehouse zone, vehicle identifier), and the temperature category (+2°C to +8°C, 15°C to 30°C, -18°C)
- Unique report number: The report must have a document control number assigned within the organisation’s quality management system
- Report date and version number: The report date must be after the study completion date — a report dated before the study ended is a fabrication. Version 1.0 is the initial issue; any revisions must show Version 1.1 or higher with a revision history
- Study period: The exact dates and times of the study — from sensor deployment to sensor retrieval. Verify this aligns with the raw data timestamps in the data appendix
- Author, reviewer, and approver: Name, title, and signature of the person who wrote the report (the mapping provider’s technician or engineer), the reviewer (the QA manager or designated reviewer at the client organisation), and the approver (the qualified person or QA director who authorises the report for compliance use)
Section 2: Protocol Reference and Compliance Statement
Every compliant thermal mapping report must reference the pre-approved protocol that governed the study. This reference is the documentary link between the study design and the study execution.
Check that:
- The report explicitly references a protocol number and version — not just states that ‘the study was conducted according to our standard procedures’
- The protocol reference date is BEFORE the study start date — if the protocol was issued after the study began, the study was not conducted under a pre-approved protocol and the GMP requirement for pre-approved protocols has been violated
- Any deviations from the protocol are documented — if the report states ‘conducted according to protocol’ but any aspect of the study differed from what the protocol specified, those differences must be documented as formal deviations with impact assessments
| The Post-Dated Protocol: The Most Serious DeficiencyThe most serious compliance deficiency that can appear in a thermal mapping report is a protocol whose approval date is the same as or after the study start date.This means the study was conducted without a pre-approved protocol — a fundamental violation of GMP Annex 15, PIC/S, and WHO GDP qualification requirements. A study conducted without pre-approved acceptance criteria, sensor placement justification, and defined methodology is not a GMP-compliant qualification study regardless of how well the data looks.If the protocol date is on or after the study start date: the report is non-compliant. Do not accept it without requesting a full re-study with a genuinely pre-approved protocol. |
Section 3: Acceptance Criteria
The acceptance criteria define what the study must demonstrate for the storage area to qualify — the temperature range that must be maintained throughout all sensor positions for the full study period. This is the most important single section of the protocol and must appear prominently in the report.
Check that:
- Acceptance criteria are stated as specific numerical values — ‘all sensors must remain within +2°C to +8°C’ not ‘sensors must remain within acceptable pharmaceutical storage temperature limits’
- Acceptance criteria are appropriate for the product stored — pharmaceutical CRT warehouses (15°C to 30°C), pharmaceutical cold rooms (+2°C to +8°C), fresh seafood cold rooms (0°C to 2°C), frozen storage (-18°C or colder). Using pharmaceutical cold room criteria for a food cold storage application is a mismatch.
- Any excursion criteria are defined — if brief temperature excursions above the primary acceptance limit are permitted (e.g., during door openings), the maximum permitted excursion duration and recovery time must be specified
- Power failure test criterion is stated — the minimum holdover time that the storage area must demonstrate before any sensor exceeds the upper acceptance limit
Section 4: Calibration Certificates
This section contains — or references the appendix containing — the individual PAB-accredited calibration certificates for every data logger used in the study. This is the foundation of the study’s measurement traceability and one of the first things an FDA inspector or principal auditor will review.
Check that:
- Individual calibration certificates are present for EVERY data logger used in the study — not a batch certificate, not a manufacturer validation certificate, not a certificate that covers the model but not the individual serial number
- The serial number on each calibration certificate matches a serial number listed in the sensor deployment table — if a certificate shows serial number SN-1234 but the sensor table lists SN-5678, there is a chain-of-identity break
- Each calibration certificate displays the PAB accreditation number of the issuing laboratory — if the certificate has no PAB accreditation number, the calibration is not PAB-accredited and does not satisfy WHO, GMP, or FDA Circular 2021-003 requirements
- The calibration date on each certificate is BEFORE the study start date — a data logger calibrated after the study cannot be considered to have been calibrated at the time of the study
- Calibration temperature points on each certificate cover the temperature range relevant to the study — a certificate showing calibration only at +20°C is not adequate for a study in a +2°C to +8°C cold room
- Each certificate states measurement uncertainty — a certificate with no measurement uncertainty is not a complete ISO/IEC 17025 calibration certificate
Section 5: Sensor Placement Map and Table
This section documents where every sensor was physically positioned during the study. It must contain both a text table (sensor ID, position description, coordinates or physical location description) and an annotated floor plan or diagram showing sensor positions visually.
Check that:
- Every sensor listed in the calibration certificates section appears in the sensor table — the number of sensors deployed should equal the number of calibration certificates provided
- Sensor positions cover the full storage volume — all 8 geometric corners, plus door-adjacent zone, cooling unit zone, and any identified risk locations. A 2,000 square metre warehouse with only 8 sensors has inadequate spatial coverage
- The floor plan diagram shows sensor positions clearly labelled by ID — a floor plan with numbered dots that don’t match the sensor table is useless for interpreting which graph belongs to which position
- Risk zone sensors are explicitly identified — the sensor nearest the door (hot spot candidate), the sensor nearest the cooling unit (cold spot candidate), and sensors in any HVAC dead zones or wall-adjacent high-risk areas
- Justification for sensor placement is provided — either in the report or by reference to the protocol. Regulators and auditors increasingly expect risk-based justification for sensor positions, not just geometric coverage
Section 6: Ambient Conditions Record
WHO TRS 961 Supplement 8 requires that outdoor temperature and humidity be recorded continuously throughout the study period. The ambient conditions record contextualises the study results — enabling any reviewer to assess whether the study was conducted under representative or worst-case ambient conditions.
Check that:
- Outdoor temperature and humidity data is present for the full study period — not just a note that ‘ambient conditions were typical for the season’
- The data comes from a calibrated instrument — the ambient monitoring thermometer/hygrometer should also appear in the calibration certificates section, or its calibration status should be documented
- The ambient conditions record covers any seasonal claim made in the study — if the report claims to be a summer qualification study, the ambient temperature record should show summer ambient temperatures (35°C+ for Philippine summer)
- Significant ambient events are noted — if a typhoon, an unusual heat wave, or an extended power interruption occurred during the study period, this should be documented and its impact on the study assessed
Section 7: Temperature Data and Statistical Analysis
This section contains the core technical content of the mapping study: the temperature data recorded at each sensor position, statistical analysis of that data, and identification of the hot spots and cold spots within the storage area.
Check that:
- Time-temperature graphs are provided for each sensor location — showing the full study period from start to finish. A summary table of statistics without supporting graphs does not allow verification of the statistical claims
- Statistical summary is complete for each sensor: minimum, maximum, mean, and standard deviation — at minimum. Some reports also include percentile statistics
- Hot spot and cold spot are explicitly identified — the sensor ID with the highest maximum temperature (hot spot) and the sensor ID with the lowest minimum temperature (cold spot) must be clearly stated, not left to the reader to identify from the data
- Compliance determination is stated: did ALL sensors remain within the acceptance criteria for the FULL study period? A statement that ‘the majority of sensors were within limits’ is not a pass — all sensors must be within limits for a compliant qualification
- Any excursions are documented and assessed — if any sensor exceeded the acceptance limits during the study, the excursion must be documented (duration, magnitude, affected sensor, time of occurrence), the cause must be investigated, and the impact on the compliance conclusion must be stated
Section 8: Power Failure Test Data
The power failure holdover test is one of the most operationally important outputs of any Philippine thermal mapping study. The report must present this data clearly, with explicit identification of the holdover time.
Check that:
- The power failure test section is present — if there is no power failure test section, the study is incomplete. In a Philippine operating context with significant power interruption risk, this is a critical omission
- The holdover time is explicitly stated: ‘The time from power interruption to the first sensor reaching the upper acceptance limit was X minutes’ — not implied from a graph that the reader must interpret
- The power failure test was conducted at an appropriate point in the study — after sufficient baseline data was collected (typically after 48 hours of stable data), not at the beginning of the study before the storage area had reached stable operating conditions
- The ambient conditions during the power failure test are stated — the holdover time under Philippine summer conditions (35°C ambient) is significantly shorter than under cool-season conditions. The holdover time should be accompanied by the ambient temperature at the time of the test
- The power failure test acceptance criterion from the protocol is referenced — confirming whether the measured holdover time met the required minimum
Section 9: Seasonal Study Context
This section contextualises the current study within the facility’s seasonal mapping programme — confirming which season was studied and what the complementary study covers.
Check that:
- The report explicitly identifies the season of the study — ‘This study was conducted during April-May [year], representing the hot dry season (Amihan/Habagat transition) in Metro Manila, with daytime temperatures consistently above 35°C’
- For CRT warehouses and food cold storage, the report acknowledges the seasonal mapping obligation under WHO TRS 961 Supplement 8 and states whether this is the first of two required seasonal studies or a complement to a previously conducted study
- If this is not a summer study, the report should state when the complementary summer study is planned — or reference the summer study that is already on file
Section 10: Conclusions and Recommendations
The conclusions section translates the technical findings into the compliance determination and operational guidance that the QA manager and operations team need.
Check that:
- A clear pass/fail compliance determination is stated for each acceptance criterion — not qualified language like ‘generally satisfactory’ or ‘largely compliant’
- Permanent monitoring sensor placement recommendations are provided — the hot spot and cold spot identified in the study must be the recommended positions for permanent monitoring sensors. If the report doesn’t include this recommendation, it is leaving the most important operational output unaddressed
- Any no-storage zone recommendations are clearly stated — areas identified as non-compliant during the study (zones exceeding the acceptance criteria) must be recommended as no-storage zones with a specific physical description
- The power failure holdover time is translated into an operational implication — ‘The maximum acceptable power interruption duration before emergency product protection measures must be initiated is X minutes’
- Any corrective actions are clearly identified — if the study found compliance failures, the recommendations must specify what corrective actions are needed before the facility can be considered qualified
Section 11: Approval Signatures
The approval signatures section formally completes the report and establishes who has taken responsibility for its content and compliance claims.
Check that:
- The author signature (mapping provider technician or engineer) is present — confirming that the report accurately represents the study as conducted
- The QA reviewer signature is present — confirming that a qualified QA professional has reviewed the report for completeness and compliance
- The approver signature is present — the qualified person or QA director who is authorising this report as a compliance document for the organisation
- All signatures are dated AFTER the study completion date — signatures dated before the study ended cannot represent a genuine review of completed study data
2. The Calibration Certificate Deep-Dive: The Most Important Attachment
Of all the attachments in a thermal mapping report, the PAB-accredited calibration certificates for the data loggers are the most important for regulatory compliance. This section provides detailed guidance on reviewing them.
How to Verify PAB Accreditation
Every calibration certificate attached to the report should display a PAB accreditation number (format: LA-YYYY-XXXN). To verify that this accreditation number is genuine and current:
- Go to the PAB directory at pabaccreditation.dti.gov.ph
- Search for the calibration laboratory by name or accreditation number
- Confirm that the laboratory is listed, its accreditation is currently valid (not expired), and temperature calibration is in its scope of accreditation
If the calibration certificate does not display a PAB accreditation number, or if the number does not appear in the PAB directory, the calibration is not PAB-accredited. This is a non-negotiable deficiency for pharmaceutical GMP and FDA Circular 2021-003 compliance applications.
The Calibration Certificate Completeness Check
Beyond verifying PAB accreditation, check each calibration certificate for:
- The specific serial number of the calibrated data logger — matching the serial number recorded in the sensor deployment table
- Multiple calibration temperature points — at minimum three points spanning the study temperature range (e.g., 0°C, +5°C, +10°C for a cold room study)
- The deviation at each calibration point — the difference between the reference value and the logger’s reading
- The expanded measurement uncertainty at each calibration point — stated as ±X°C at k=2 (approximately 95% confidence)
- A traceability statement — linking the calibration to national standards through DOST-ITDI NML
- The calibration date — must be before the study start date
- A recommended recalibration interval or validity period
A calibration certificate that lacks measurement uncertainty, contains no traceability statement, shows calibration at only one temperature point, or does not display a PAB accreditation number is not a complete ISO/IEC 17025 calibration certificate and should not be accepted for pharmaceutical GMP compliance applications.
3. Understanding the Temperature Data: What the Graphs Are Telling You
The time-temperature graphs in the data section of a thermal mapping report contain the evidence that supports every compliance conclusion in the report. Even a non-technical QA reviewer can learn to read these graphs for the key information they contain.
Reading a Time-Temperature Profile
A time-temperature profile graph shows temperature (y-axis, in °C) over time (x-axis, in hours or days) for a single sensor position. The horizontal lines on the graph represent the acceptance criteria limits. For a pharmaceutical cold room with +2°C to +8°C acceptance criteria, there are two horizontal lines: one at +2°C (lower limit) and one at +8°C (upper limit). All temperature readings for the study period must fall within these two lines for that sensor to demonstrate compliance.
What to look for when reading a time-temperature profile:
- The overall level: Is the sensor consistently within the acceptance criteria, or does it approach or exceed the limits? A sensor whose readings consistently hover near the upper limit is a concern even if it technically passes — it indicates the storage area has little thermal margin.
- Periodic temperature cycles: Regular up-down cycles in the temperature profile are typically defrost cycles (in cold rooms and freezers) — the refrigerator or cold room cycles off for defrost, temperature rises, then drops again when cooling resumes. The peak of the defrost cycle must remain within the acceptance criteria.
- Sudden temperature spikes: A sharp, rapid temperature rise followed by gradual recovery is typically a door-opening event — warm ambient air enters the storage area when the door is opened, the temperature rises quickly, then drops as the cooling system recovers. These spikes should be within any permitted excursion limits defined in the acceptance criteria.
- Progressive temperature drift: If the temperature profile shows a gradual upward drift over the study period — rather than returning to the same baseline level — this may indicate that the refrigeration system cannot fully recover from the cumulative effect of defrost cycles and door openings under the study’s ambient conditions.
- The power failure segment: Look for the section of the graph where temperature rises sharply and continuously — this is the power failure test. The time from the start of the rise to the point where the temperature first exceeds the upper acceptance limit is the holdover time.
Reading the Statistical Summary Table
The statistical summary table presents the key statistics for each sensor in a compact format. Typical columns include: Sensor ID, Position Description, Minimum Temperature, Maximum Temperature, Mean Temperature, and Standard Deviation.
The hot spot is the sensor with the highest maximum temperature — this should be explicitly identified in the report. The cold spot is the sensor with the lowest minimum temperature. These are the sensors that must be positioned at the monitoring system’s permanent sensor locations after the mapping study.
Check that the maximum temperature for the hot spot sensor is within the upper acceptance limit — and review whether this maximum occurred during normal operation or only during an explicitly permitted excursion (door opening, defrost cycle). If the maximum occurred during normal steady-state operation, the facility may not have adequate compliance margin.
4. The Complete Report Review Checklist
The following checklists systematise the review described in the previous sections into a structured tool that any Philippine QA manager can use to review a thermal mapping report before signing it.
| ✓ | Section 1: Document Identity and Control |
| □ | Report title clearly identifies study type, storage area, and temperature category |
| □ | Unique report document control number assigned |
| □ | Report version number (V1.0 or higher) and date stated |
| □ | Study period (start date and end date) clearly stated |
| □ | Author, reviewer, and approver signatures all present |
| □ | All signatures dated AFTER study completion date |
| ✓ | Section 2: Protocol and Pre-Approval |
| □ | Specific protocol number and version referenced in the report |
| □ | Protocol approval date is BEFORE study start date — verify this carefully |
| □ | Any deviations from the protocol are documented as formal deviations |
| □ | Impact of any deviations on study validity is assessed |
| ✓ | Section 3: Acceptance Criteria |
| □ | Specific numerical acceptance criteria stated — not vague descriptions |
| □ | Criteria are appropriate for the product type stored in the facility |
| □ | Power failure test minimum holdover time stated as acceptance criterion |
| □ | Any excursion duration limits defined if brief excursions are permitted |
| ✓ | Section 4: Calibration Certificates |
| □ | Individual PAB-accredited calibration certificate for EVERY data logger used |
| □ | PAB accreditation number visible on each certificate (format: LA-YYYY-XXXN) |
| □ | Serial number on each certificate matches serial number in sensor table |
| □ | Calibration date for each certificate is BEFORE study start date |
| □ | Calibration covers multiple temperature points spanning study range |
| □ | Measurement uncertainty stated on each certificate |
| □ | Traceability statement present on each certificate |
| ✓ | Section 5: Sensor Placement |
| □ | Sensor table lists all sensors with unique IDs and position descriptions |
| □ | Number of sensors in table equals number of calibration certificates |
| □ | Annotated floor plan/diagram shows all sensor positions by ID |
| □ | All 8 geometric corners of storage volume covered by sensors |
| □ | Door-adjacent zone sensor present (hot spot candidate) |
| □ | Cooling unit zone sensor present (cold spot candidate) |
| □ | Adequate spatial coverage for storage area size — not just 8 sensors for a large warehouse |
| ✓ | Section 6: Ambient Conditions and Seasonal Context |
| □ | Continuous outdoor temperature and humidity record present for full study period |
| □ | Ambient monitoring instrument calibration status documented |
| □ | Seasonal identification stated — which season was studied, with PAGASA-consistent data |
| □ | For summer claim: ambient temperature record shows 35°C+ days |
| □ | Seasonal mapping obligation acknowledged and complementary study referenced or planned |
| ✓ | Section 7: Temperature Data and Analysis |
| □ | Time-temperature graphs present for every sensor position |
| □ | Statistical summary (min, max, mean, SD) present for every sensor |
| □ | Hot spot explicitly identified by sensor ID and position |
| □ | Cold spot explicitly identified by sensor ID and position |
| □ | Clear pass/fail compliance statement for each acceptance criterion |
| □ | Any temperature excursions documented with duration, magnitude, and impact assessment |
| ✓ | Section 8: Power Failure Test |
| □ | Power failure test section is present — if absent, study is incomplete |
| □ | Holdover time explicitly stated in minutes |
| □ | Ambient temperature during power failure test stated |
| □ | Power failure test acceptance criterion referenced and compliance stated |
| □ | Operational implication of holdover time stated (maximum brownout duration) |
| ✓ | Section 9: Conclusions and Operational Recommendations |
| □ | Clear pass/fail determination stated |
| □ | Permanent monitoring sensor placement recommended at hot spot and cold spot |
| □ | Any no-storage zones clearly identified with physical description |
| □ | Corrective actions specified if any compliance failures were found |
| □ | Power failure emergency response trigger time stated |
5. Common Deficiencies in Philippine Thermal Mapping Reports
Based on experience reviewing thermal mapping reports for Philippine pharmaceutical, food, and logistics companies, the following deficiencies are the most frequently found. Knowing these patterns helps QA managers identify problems quickly during report review.
Deficiency 1: No Protocol, or Protocol Issued After Study Start
Frequency: Very common. Impact: Critical — the study is not GMP-compliant without a pre-approved protocol. The report may present perfectly valid temperature data, but without a pre-approved protocol defining the acceptance criteria and study design before data collection began, the study cannot be defended as a GMP-compliant qualification exercise.
What to ask: ‘Can you provide the protocol with its original approval signatures showing the approval date?’ If the approval date is on or after the study start date, request a re-study with a genuinely pre-approved protocol.
Deficiency 2: Batch Calibration Certificate Instead of Individual Certificates
Frequency: Common. Impact: High — batch certificates show that the model performed to specification during production testing, not that this specific logger was calibrated against a traceable standard. Pharmaceutical GMP and WHO TRS 961 require individual traceable calibration for each instrument used in a qualification study.
What to ask: ‘Can you provide individual calibration certificates with serial numbers for each logger deployed, from a PAB-accredited laboratory?’
Deficiency 3: Calibration by Non-PAB-Accredited Laboratory
Frequency: Moderately common. Impact: High — without PAB accreditation, the calibration has no internationally recognised measurement traceability. The certificates may look similar to PAB-accredited ones but lack the independent competence verification that PAB accreditation represents.
What to check: Verify every calibration certificate in the report against the PAB directory at pabaccreditation.dti.gov.ph before accepting the report.
Deficiency 4: Study Conducted Only in the Cool Dry Season
Frequency: Very common. Impact: High — a December or January study does not characterise summer performance for a Philippine CRT warehouse or food cold storage facility. WHO TRS 961 Supplement 8 requires seasonal mapping for facilities in climates with significant seasonal variation. The Philippines clearly qualifies.
What to ask: ‘What were the ambient temperatures during the study period?’ If the ambient record shows temperatures consistently below 28°C, this is a cool-season study. For CRT warehouses, the summer qualification study (April to May) is the most critical and is likely still needed.
Deficiency 5: Power Failure Test Missing
Frequency: Common. Impact: High in the Philippine context — power interruption is a real operational risk, and the holdover time is the specification that drives emergency response protocols. A mapping study without a power failure test is missing one of its most practically important outputs.
What to ask: ‘Was a power failure test conducted? If not, can you return to the facility to conduct one?’ If the mapping provider cannot conduct a power failure test, the holdover time must be established by another validated method before the qualification can be considered complete.
Deficiency 6: Too Few Sensors for the Storage Area Size
Frequency: Common. Impact: Moderate to High — inadequate sensor density means the study cannot credibly claim to have characterised temperature distribution throughout the space. Hot spots between sensor positions go undetected.
What to check: Compare the number of sensors deployed (from the sensor table) against the storage area volume. For a 2,000 square metre warehouse, fewer than 20 to 25 sensors is inadequate. For a large pharmaceutical warehouse, 40 to 60 sensors may be needed. If the sensor count seems very low, ask the mapping provider to justify the sensor density relative to WHO/ISPE guidance.
Deficiency 7: Compliance Conclusion Not Clearly Stated
Frequency: Moderately common. Impact: Moderate — if the report does not clearly state whether the facility passed or failed, the QA manager cannot make an informed acceptance decision, and the report cannot be cited as a qualification conclusion in subsequent compliance submissions.
What to require: A clear, explicit statement of the compliance conclusion for every acceptance criterion — ‘All sensors remained within +2°C to +8°C throughout the study period: PASS’ or ‘Three sensors exceeded +8°C during door-opening events of duration exceeding the permitted 10 minutes: FAIL.’
6. What to Do When a Report Has Deficiencies
When a thermal mapping report review reveals one or more deficiencies, the QA manager must decide on the appropriate response. The response depends on the severity of the deficiency.
Critical Deficiencies — Do Not Accept
The following deficiencies render the report non-compliant regardless of the quality of the temperature data:
- Protocol approved after study start — the study was not conducted under a pre-approved protocol; a re-study is required
- No individual PAB-accredited calibration certificates — the measurement data has no traceable calibration basis; calibration must be obtained for the specific loggers used or the study repeated with properly calibrated instruments
- Calibration by non-PAB-accredited laboratory — not traceable to national standards; same consequence as above
Significant Deficiencies — Request Correction Before Filing
The following deficiencies require correction before the report is accepted into the compliance file, but may not require a complete re-study:
- Power failure test missing — the mapping provider may be able to return to conduct the test separately, with a supplementary report section
- Seasonal context not documented — the ambient conditions record should be added if available; if not available, the seasonal qualification study is incomplete and the complementary season study must be planned
- Compliance conclusion not clearly stated — the mapping provider can issue a revised conclusion section without repeating the study
Minor Deficiencies — Document and Accept with Note
The following deficiencies can be documented and accepted with a formal note in the compliance file explaining the gap and the risk assessment conclusion:
- Slightly lower sensor density than ideal, with adequate coverage of identified risk zones — document the sensor count and the risk assessment that supports the adequacy of coverage
- Minor deviations from protocol not formally documented — request a retrospective deviation report from the mapping provider
- Monitoring sensor placement recommendation missing from conclusions — request the recommendation as a supplementary document
| Metrologie Solutions Philippines: Report Review ServicesIf you are uncertain about the quality of a thermal mapping report in your compliance file — from any provider — contact Metrologie Solutions Philippines for a professional report review.We assess reports against WHO TRS 961 Supplement 8, GMP Annex 15, FDA Circular 2021-003, and ISO/IEC 17025 requirements, and provide a written assessment of any gaps with recommendations for corrective action.Website: metrologiesolutions.com | Services: Thermal Mapping Report Review · Thermal Mapping Studies · Calibration · Training |
7. Frequently Asked Questions: Reading and Evaluating Thermal Mapping Reports
How long should a thermal mapping report be?
There is no regulatory requirement for a specific page count, but a complete, compliant pharmaceutical cold room thermal mapping report is typically 30 to 80 pages including all appendices. This includes: the report body (15 to 30 pages covering all required sections), the protocol appendix (5 to 15 pages), the calibration certificates appendix (1 to 2 pages per data logger), the sensor placement diagram appendix (1 to 3 pages), and the raw data appendix (graphs for each sensor plus statistical summary tables). A 5-page report for a 20-sensor pharmaceutical cold room study is almost certainly incomplete — there is not enough space for all required content.
Is it acceptable if some sensors show brief exceedances of the acceptance criteria during door openings?
It depends entirely on whether the protocol explicitly permits brief excursions above the acceptance limit during door openings, and whether the duration of the excursion is within the permitted limit stated in the protocol. If the protocol specifies ‘temperature excursions above +8°C during door openings are permitted for a maximum of 10 minutes, provided the temperature returns to within the acceptance criteria within 15 minutes of door closure,’ then excursions meeting these criteria are permissible. If the protocol defines the acceptance criterion as ‘no sensor may exceed +8°C at any time,’ then any excursion is a compliance failure requiring investigation. Never interpret excursions as acceptable unless the protocol explicitly permits them with defined duration limits.
The report shows that one sensor was above the upper acceptance limit for 3 hours during the study. Can we still accept the report as passing?
No — if a sensor recorded temperatures above the upper acceptance limit for any sustained period during normal steady-state operation (not during an explicitly permitted excursion event), the storage area did not demonstrate compliance with the acceptance criterion for that sensor location. The report should indicate a non-compliant finding for this sensor and recommend corrective action. Accepting a report that shows a 3-hour exceedance as ‘passing’ on the grounds that ‘the area is generally compliant’ is not defensible under GMP or WHO GDP standards.
The mapping provider has sent us a report without a signed protocol. They say the protocol will follow. Can we accept the report provisionally?
No. The protocol must precede the study, and the report must be reviewed in conjunction with the protocol — not separately. Accepting a report without the protocol means accepting temperature data without knowing: what acceptance criteria the study was designed to demonstrate, how sensor positions were justified, what the power failure test methodology was, and what conditions the study was intended to be conducted under. Without the protocol, you cannot verify that the study was conducted as planned. Request the complete documentation package — report, protocol, calibration certificates, and sensor placement diagram — before beginning your review.
Conclusion: The Signed Approval Is Your Accountability Moment
A thermal mapping report approval signature is not a formality. It is the moment at which a QA manager takes professional and regulatory responsibility for the accuracy of the claim that the storage area covered by the report is qualified, compliant, and fit for the products it holds.
A deficient report that a QA manager signs without reviewing — because it looks professional, because the provider has done the work before, because there is time pressure — is a compliance liability that belongs to the signing QA manager. When an FDA inspector, a WHO auditor, or a principal quality auditor finds the deficiency, the QA manager’s signature is the evidence that it was accepted knowingly.
The checklist in this guide gives every Philippine QA manager the tools to review a thermal mapping report systematically and completely — in 30 to 60 minutes, without needing to be a metrology expert. Use it every time. File it with the report as evidence of the review. And if a report fails the checklist, return it to the provider for correction before signing.
This is what quality management means: not assuming that work done on your behalf was done correctly, but verifying it — and protecting the compliance programme, the products, and the patients that your signature represents.
| Metrologie Solutions Philippines Produces Reports That Pass This ChecklistOur thermal mapping reports are built to pass every item on the checklist in this guide — pre-approved protocols, individual PAB-accredited calibration certificates for every logger, complete sensor documentation, seasonal study context, power failure test data, and clear compliance conclusions with monitoring sensor placement recommendations.If you are not satisfied with a previous provider’s report, or if you want to start your next mapping study with a provider whose documentation quality you can rely on — contact Metrologie Solutions Philippines.Website: metrologiesolutions.com | Services: Thermal Mapping · Calibration · Report Review · Training |
| About Metrologie Solutions PhilippinesMetrologie Solutions Philippines produces thermal mapping reports to the standard described in this guide — with all required sections, PAB-accredited calibration certificates, pre-approved protocols, complete data analysis, and approval-ready documentation for Philippine FDA, WHO, GMP, and international principal qualification review. We also offer report review services for Philippine QA teams who want to assess the completeness and compliance quality of existing mapping reports in their files.Website: metrologiesolutions.com | Services: Thermal Mapping · Report Review · Calibration · Training |
