ISO/IEC 17025 clause 7.4: protect test and calibration items
Clause 7.4 requires a procedure for handling test and calibration items throughout their time under laboratory responsibility. The arrangements must protect item integrity and the interests of the customer and laboratory. Identification and condition control are technical safeguards, not simply sample-reception administration.
What clause 7.4 requires in practice
Clause 7.4 covers everything that happens to an item while it is the laboratory's responsibility. A procedure must cover each stage in the life of an item: moving it in, receiving it, handling and protecting it, keeping it, then either disposing of it or sending it back. It must guard against decay, contamination, loss or damage, and must respect any handling instructions supplied with the item. The aim is to protect the integrity of the item and the interests of both the laboratory and the customer.
A system for unambiguous identification must keep each item distinct, physically and in records, for as long as the laboratory is responsible, including when an item is divided or transferred. On receipt, deviations from specified conditions are recorded; if suitability is in doubt, or the item does not match its description, the customer is consulted and the outcome recorded. If work goes ahead despite a deviation, the report carries a disclaimer on affected results. Where specific storage or conditioning conditions apply, they are maintained, monitored and recorded.
Cover the complete item journey
Address transport, receipt, handling, protection, storage, retention and disposal or return. Take precautions against deterioration, contamination, loss and damage during waiting and preparation as well as during active work. Follow handling instructions supplied with the item.
Determine controls appropriate to the activity. A precision instrument, a perishable sample and a construction-material specimen can need different arrangements. The standard does not set one universal storage temperature or retention period for all items; applicable methods, contracts and technical requirements guide those decisions.
Maintain unambiguous identification
The identification system must prevent physical and documentary confusion while the laboratory is responsible for the item. Where relevant, accommodate subdivisions, groups and transfers. Labels, barcodes or another system may be used, but the chosen approach needs to preserve the connection among the original item, portions, records and report.
Consider points where identity can be lost: relabelling, preparation into several containers, movement between departments or receipt of several similar instruments. A clear sample register is not sufficient if the physical items become indistinguishable on the bench.
Resolve unsuitable or unexpected conditions before proceeding
Record deviations from specified conditions at receipt. If suitability is doubtful or the item does not match its description, consult the customer before proceeding and record the outcome. Do not quietly correct the paperwork or assume the analyst will resolve the issue later.
If the customer asks the laboratory to test or calibrate despite an acknowledged deviation, the report must include a disclaimer identifying which results may be affected. This is not a blanket permission to perform invalid work or conceal the limitation. Evaluate the technical situation and the applicable contract and method requirements.
Where specified storage or conditioning environments are needed, maintain, monitor and record them under clause 7.4.4. A receipt check does not protect an item subsequently stored under unsuitable conditions.
Why clause 7.4 matters to the laboratory
Results are only meaningful for the item that was actually measured. A mislabelled specimen, a sample that warmed up on the loading bay or an instrument returned with unrecorded damage turns careful technical work into a liability. These failures are common because they happen in corridors and stores, not at the bench. Strong item handling reduces lost work, repeat testing and awkward conversations about whose fault a poor result was. It also lets the laboratory show a customer exactly what condition their item arrived in, which is valuable evidence if an outcome is disputed or an instrument fails shortly after calibration.
How to implement clause 7.4
Walk the physical route of an item and make each stop deliberate. Involve reception, store and bench staff together, because identity and condition are usually lost at the handovers between them.
- Trace an item from delivery door to disposal or return, listing each place it waits or changes hands.
- Set receipt checks that compare condition and description with what was ordered, and give staff a clear route when they find a difference.
- Choose an identification method that survives preparation, subdivision and movement, and define how portions inherit the original identity.
- Define storage and conditioning needs by item type, and place monitoring where it covers the actual storage location.
- State retention, disposal and return rules, agreed with customers where their interests are involved.
- Include a template for the customer consultation record and for the report disclaimer when work proceeds despite a deviation.
- Audit the route occasionally by following a live item without warning staff in advance.
Two illustrative handling decisions
A calibration laboratory receives an instrument with evidence of transport damage. It records the condition and consults the customer before proceeding. If work continues, the technical and reporting implications are addressed explicitly rather than issuing a normal report that hides the deviation.
A materials testing laboratory divides one received sample into several test portions. Its identification system preserves the link between each portion and the original item through preparation and records. Similar-looking portions from different jobs are not distinguished only by their position on a workbench.
Evidence and common mistakes
Keep the required procedure, identification records, receipt deviations, customer consultation and relevant environmental records. The standard does not prescribe one chain-of-custody form for all services, although such a form may be useful or required by a specific application.
Avoid treating customer acknowledgement as a reason to omit a report limitation, accepting undocumented sample substitutions, or disposing of items before checking agreed retention needs. Review handovers with couriers and external sites where responsibility or conditions can become unclear.
Frequently asked questions
Must we reject every item received outside specified conditions?
Not automatically. Record the deviation, assess suitability and consult the customer before proceeding where required. Technical validity and accurate reporting must remain protected.
Is a barcode system mandatory?
No. The requirement is unambiguous identification throughout laboratory responsibility, including relevant subdivision and transfer. A manual system can work if it controls those risks effectively.
Does customer approval remove the need to report a condition problem?
No. Where the customer proceeds despite an acknowledged deviation, the report must identify the results that may be affected. Agreement does not erase the technical limitation.
Turn this requirement into reliable laboratory practice
Sterling can help review the item journey and the decisions made when samples or instruments arrive with problems. Use a laboratory consultation to target identification, handover and reporting improvements within your implementation programme.
Build the team's understanding through Documented Information Management. Discuss the relevant scope, employee learning and agreed access to Effivity ISO & GRC automation software with Sterling; laboratory technical decisions remain with competent, authorised personnel.
ISO/IEC 17025 requirements hub · Process requirements · Sampling controls · Common report information