ISO/IEC 17025 by industry
ISO 17025 for food testing laboratories: residues, contaminants, microbiology and sample integrity under accreditation
Clause by clause: ISO/IEC 17025:2017 requirements: every clause explained →
What changes when the laboratory tests food, feed and crops: who relies on the results, how to write a scope of tests and matrices, where assessors sample sample integrity, matrix validation, quality control and decision rules, and how accreditation sits beside ISO 22000, ISO 9001 and regulator requirements.
Key points
- Food and agriculture results carry consequences outside the laboratory: a residue or contaminant result can hold a shipment, support an export certificate or decide whether a batch is released.
- The scope of accreditation names tests, matrices and ranges, so "pesticide residues in food" is not a scope; residues by a stated technique in defined commodity groups is.
- Assessors concentrate on sample integrity from receipt to disposal, matrix-specific validation, recoveries and quality control, and the decision rule applied when a result sits near a limit.
- Microbiology and chemistry are assessed as separate disciplines, with their own facilities, equipment, proficiency testing and competence evidence.
Why food and agriculture laboratories are asked for ISO 17025
The request comes from whoever relies on the number. Exporters and their buyers want residue, contaminant and microbiology results that an importing authority will accept behind an export certificate. Brand owners and retailers write accredited results into supplier specifications and release criteria. Manufacturers sending out pathogen or allergen samples check the scope before signing a testing contract, and nutrition labelling results have to stand up when a label is challenged.
Where a food regulator or an importing country's authority designates or recognises laboratories for official testing, accreditation for the relevant tests may be one of its conditions. Its own rules decide, by country and commodity, so confirm them before you plan the scope. For the wider question, see Do you need ISO/IEC 17025? A decision guide for laboratories.
Scope for a food laboratory: tests, matrices and sampling
A food or agriculture scope lists each test by analyte or organism, method, technique, matrix and range: aflatoxins in grains and nuts, Salmonella detection in ready-to-eat foods, moisture and fat in feed, heavy metals in seafood. Each matrix group claimed needs its own evidence, because commodities behave differently in extraction and recovery.
Three scope mistakes recur. The first is claiming "all foods" for a method validated on two commodities. The second is leaving sampling out of the scope while the laboratory's own staff collect samples at farms, warehouses or ports; if you sample, decide whether sampling is claimed and plan for it. The third is subcontracting specialised residue or allergen work without evaluating the subcontractor as an external provider or telling the customer. How to write the schedule is covered in ISO/IEC 17025 scope of accreditation: fixed, flexible and how to write it.
Where the requirements bite in a food laboratory
| Requirement area | What it means in a food laboratory | Evidence the assessor samples |
|---|---|---|
| Sampling and handling of test items | Sample integrity from collection to disposal: temperature on arrival for chilled and frozen samples, time to analysis for microbiology, sub-sampling and homogenisation of heterogeneous lots, and retention of the retained portion | Sampling plans, chain-of-custody forms, receipt logs with temperature and condition, rejection or deviation notes, homogenisation records, storage and disposal logs |
| Selection, verification and validation of methods | Standard methods verified in your hands for each matrix; in-house and multi-residue methods validated for recovery, precision, limit of quantification and matrix effects | Verification and validation files per method and matrix group, spiking and recovery data, reference material results, the approval record before use |
| Evaluation of measurement uncertainty and statements of conformity | Residue and contaminant results are read against maximum limits, and nutrient results against label declarations, so uncertainty and the decision rule decide pass or fail near a limit | Uncertainty budgets per method, the decision rule agreed at contract review, reports that state conformity and the rule applied |
| Ensuring the validity of results | Routine quality control on every run plus proficiency testing matched to your analytes, organisms and matrices | Blanks, spikes and control samples on control charts, positive and negative culture controls, media performance checks, a proficiency testing plan with results and the action taken on each |
| Facilities, environment and equipment | Separation of microbiology from chemistry, contamination control for trace residue and metals work, and equipment that drifts quietly | Environmental monitoring of the microbiology area, incubator and refrigerator temperature records, balance and pipette checks, instrument calibration and intermediate checks |
Method work is covered in Method verification and validation under ISO/IEC 17025, and budgets and limits in Measurement uncertainty under ISO/IEC 17025: a budget you can defend.
Food safety systems, regulators and customers alongside ISO 17025
A food plant's laboratory supplies the verification and release data its food safety management system relies on, and independent laboratories test for plants certified to ISO 22000. The two standards do different jobs: ISO 22000 governs the food chain business, ISO/IEC 17025 the competence behind the result. For the food business side, see ISO 22000 certification, and for laboratories inside a plant, ISO/IEC 17025 for in-house manufacturing laboratories.
If the organisation already runs ISO 9001, Option B lets that management system meet clause 8, leaving the technical clauses as the real work. Regulator designation rules, customer specifications and importing-country requirements are recorded at contract review, so each result is produced and reported against the requirement it has to meet.
What a food laboratory engagement looks like
Duration depends on the number of tests, matrices and disciplines in scope, how many methods need validation rather than verification, the dates of the proficiency testing rounds for your analytes, and harvest or export peaks in sample volume. The laboratory manager, the quality manager, the section heads for chemistry and microbiology, authorised analysts, sample reception and whoever signs testing contracts take part. With Design™, Sterling guides your team to build and own the system; with Drive™, Sterling takes on more of the documentation, validation planning, internal audit and readiness work so testing keeps moving.
How Sterling works with food and agriculture laboratories
Results that hold up at the border, at the label and in the release meeting.
Our expert and experienced consultants build the system around your matrices, methods and sample flow, then audit it discipline by discipline before the accreditation body arrives. Effivity holds the management system records and is included with the engagement, at no additional cost. Sterling does not accredit; the accreditation body assesses and decides. We ensure successful accreditation for our clients.
Book a free discovery callISO 17025 for food testing laboratories: questions laboratory managers ask
Do food testing laboratories need ISO 17025 accreditation?
They need it when their customers, an importing authority or a regulator will only accept accredited results for the tests concerned.
Can one food laboratory be accredited for both microbiology and chemistry?
Yes, one accreditation can cover both disciplines. Each is assessed on its own methods, facilities, equipment, quality control and proficiency testing, usually by technical assessors with the matching expertise.
Does ISO 17025 accreditation cover sampling at farms, warehouses or ports?
Only if sampling is claimed on the scope of accreditation. If your staff collect samples but sampling is not accredited, the sampling plan and records still matter, because the result depends on them.
Is a pesticide residue method validated for one crop valid for all foods?
No, validation covers the matrices it was tested on. Other commodity groups need their own recovery and precision evidence before they appear on the scope, because extraction and matrix effects change from one to the next.
ISO/IEC 17025 by industry
Every guide in the ISO/IEC 17025 series is written for one question and links back to the hub for the whole picture.
- ISO/IEC 17025 for calibration laboratories
- ISO/IEC 17025 for chemical and microbiological testing
- ISO/IEC 17025 for construction materials testing
- Effivity ISO 17025 guide
- ISO/IEC 17025 for environmental laboratories
- ISO 17025 calibration and traceability
- ISO/IEC 17025 for food and agriculture laboratories
- ISO 17025 gap analysis
- ISO/IEC 17025 for government and forensic laboratories
- ISO 17025 implementation plan
- ISO/IEC 17025 for in-house manufacturing laboratories
Keep exploring
Explore more about ISO/IEC 17025
Watch a video on how to implement ISO 17025 here.
Watch a video on ISO 17025 requirements here.
ISO/IEC 17025 resources
Services for ISO/IEC 17025
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