ISO/IEC 17043 accreditation consulting for PT schemes laboratories and regulators can trust.

What it is

What is ISO/IEC 17043 and what is it used for?

ISO/IEC 17043 sets out what a proficiency testing (PT) provider needs to be competent and impartial and to run each of its PT schemes consistently. Proficiency testing judges each participant's performance against criteria fixed in advance, through interlaboratory comparisons: the provider prepares items, participants measure, test, calibrate, examine, inspect or sample them, and the provider evaluates the results. Participants, regulators, peer-assessment schemes and accreditation bodies use the standard to confirm the provider's competence.

A PT provider is accredited, not certified. An accreditation body working to ISO/IEC 17011 examines how schemes are designed, how items are produced and checked, how data are analysed and how performance is judged, then grants accreditation for a defined list of schemes and publishes it on its register. The standard lets a provider claim conformity only for schemes it has defined and documented, and a note in ISO/IEC 17025 tells laboratories that PT providers meeting ISO/IEC 17043 are considered competent.

Current edition. ISO/IEC 17043:2023, the second edition, was published in May 2023 and replaced ISO/IEC 17043:2010. It follows ISO/IEC 17025:2017 in structure and technical requirements, aligns its terminology with ISO 13528:2022, and adds that testing, calibration and the production of PT items must conform to the relevant requirements of the matching conformity assessment standards. The accreditation community gave accredited providers three years to move across; that transition closed in May 2026, and accreditation to the 2010 edition is no longer recognised. International recognition now runs through Global ACI (Global Accreditation Cooperation Incorporated), whose MRA replaced the IAF MLA and ILAC MRA and counts proficiency testing provision among its main scopes. ISO/IEC 17043 requirements explained, from impartiality to PT reports

Who it is for

Who needs ISO/IEC 17043 accreditation?

ISO/IEC 17043 applies to whoever takes responsibility for developing and operating a PT scheme: a commercial operator, a national metrology institute running comparisons for calibration laboratories, a public health body or regulator running external quality assessment (EQA), or a laboratory network comparing its members. Participants may be testing, calibration or medical laboratories, inspection bodies or samplers. Providers come to Sterling from four starting points:

• Your participants have to show the scheme is sound. ISO/IEC 17025 requires laboratories to compare their results with other laboratories where available and appropriate, and some accreditation bodies want PT results before granting accreditation. An accredited scope tells a participant's assessor that your design and scoring were checked independently.
• You run comparisons and want to offer them as a scheme. A reference laboratory, an instrument maker supporting its users or a laboratory group already sends out samples and compares answers. An accredited scheme needs a documented design, justified assigned values, items shown to be homogeneous and stable, and reports that evaluate performance.
• You operate EQA or a national programme. Medical EQA is proficiency testing under another name, and schemes run by metrology institutes or public bodies meet the same requirements as commercial ones.
• Your accreditation needs rebuilding. The move to the 2023 edition was rushed before May 2026, the same findings return at every surveillance visit, or new schemes have outgrown statistics written for the first one.

The benefit you are after is evaluations participants accept and act on. That comes from design, items, statistics and people working together in every round, not from a certificate.

Business benefits

How ISO/IEC 17043 accreditation supports your schemes and your participants

Accreditation should make a scheme easier to choose and its scores harder to dispute. We start where a participant challenges an assigned value, a batch of items changes in transit or a report leaves with a calculation nobody checked, and build the system around those points.

• Schemes participants can choose with confidenceAn accredited scope on a public register, recognised under the Global ACI MRA where your body is a signatory, so a laboratory can justify its choice to its own assessor.
• Assigned values you can defendA documented route to every assigned value, with its uncertainty where needed and metrological traceability in calibration schemes, so an appeal meets evidence.
• Items that do not distort the roundHomogeneity and stability criteria set by the risk to performance evaluation, and tests showing that items stay fit through storage and transport.
• Control over the partners behind a roundEvaluated laboratories, material producers and couriers, and design, evaluation and report authorisation kept in your own hands.
• Confidentiality participants rely onParticipant identities known only to the people operating the scheme, and enforceable confidentiality commitments from staff, committees and contractors.
• A catalogue that can growOne pattern for scheme plans, statistical design and item testing, reused for each new PT item type, so adding a scheme builds on evidence you already hold.

Measure what these priorities should change: appeals and complaints per round, reports amended after issue, late dispatches, items failing homogeneity or stability checks. A longer procedure manual is not a result.

Requirements

What are the main ISO/IEC 17043 requirements?

ISO/IEC 17043:2023 has five requirement clauses, 4 to 8, laid out like ISO/IEC 17025:2017 rather than on the harmonised structure of management system standards. Clause 7 follows a scheme from contract to report, then complaints and appeals; clause 8 lists the minimum management system, which a quality management system, for example one meeting ISO 9001, can satisfy. Informative annexes cover types of PT scheme and statistical methods, with ISO 13528 as the statistical reference. The table is a plain-language map; the programme checks your provider against every requirement, scheme by scheme.

Accreditation process

How do you get ISO/IEC 17043 accredited?

Build a provider whose schemes meet the standard, run at least one round under the system, then apply to an accreditation body, which assesses and decides. Sterling provides consulting and preparation; the decision belongs to the body, and that independence gives an accredited scope its worth. Procedures vary by body; these six steps are common to them.

1. 01
   Choose the schemes and the body.Decide which schemes and PT item types go on the application and who the participants are, and select an accreditation body that is a Global ACI MRA signatory for proficiency testing provision.
2. 02
   Gap analysis: review the provider against clauses 4 to 8, scheme by scheme.The gap analysis covers impartiality, confidentiality, personnel, external providers, design, statistics, item production, evaluation, reporting and the management system, keeps what works and agrees actions, owners and dates.
3. 03
   Implement, then run a round under the system.Document the statistical design and assigned-value procedure, validate the software, authorise staff and qualify external providers, then operate a complete round, from homogeneity and stability testing to the authorised report, so there are records to assess.
4. 04
   Audit, review and close every finding.An internal audit that follows a round through item production, data analysis and reporting as well as the management system, then a management review; we raise findings first and close them with evidence before the application.
5. 05
   Complete the accreditation body's assessment.Application and document review, a preliminary visit where the body offers one, then the assessment by a lead assessor and technical experts who interview staff, witness key activities and examine how items were produced, tested and scored; findings are closed by the body's deadline before it decides.
6. 06
   Keep the accreditation working.Rounds, internal audits and management reviews continue, alongside the body's surveillance, normally each year, a full reassessment on the cycle it sets, and extensions as schemes are added.

Judge the route before the price. Only accreditation bodies working to ISO/IEC 17011 accredit PT providers; an "ISO 17043 certificate" from a certification body or a consultant is not accreditation. Ask which body will assess you, and confirm on the Global ACI directory that proficiency testing provision is among its scopes. How to choose credible ISO/IEC 17043 support · The accreditation buyer's checklist

Cost

How much does ISO/IEC 17043 accreditation cost?

There is no single figure. One chemistry scheme run from one site needs a different programme from twenty schemes across microbiology, calibration and inspection shipped to forty countries, and the accreditation body charges for the assessment time each scope needs. What Sterling commits to is a proposal that shows every component, with our own fee fixed.

Timeline

How long does ISO/IEC 17043 accreditation take?

Plan on nine to fifteen months for a first accreditation. Three things set the pace and none can be hurried: a scheme has to run under the system, with items produced, tested for homogeneity and stability, dispatched, analysed and reported, before there is evidence to assess; round dates follow the calendar you publish to participants; and the accreditation body needs time for document review, scheduling, the assessment and the closure of findings. We plan around those dependencies, with milestones tracked in Effivity.

If a regulator or a large participant has set a date, tell us at the start. We will say what is achievable, which round should be the first under the system and where an early decision on scope saves months. Any accreditation date offered before someone has read your statistical design is a guess.

Challenges

Common ISO/IEC 17043 implementation challenges

Most PT providers stall on the same five points, most of them inside the scheme rather than the manual. Each has a practical answer.

Your engagement

What your ISO/IEC 17043 engagement includes

The engagement is scoped around what an assessment team will examine: the management system, the evidence behind each scheme, and people able to explain both. Many advisers hand over a manual and leave the statistics to you; Sterling covers the whole journey, from one team, under one all-inclusive proposal.

• Scope, gap analysis and implementation plan

  One scheme at a time, with responsibilities, dates and decision owners fixed before work begins.

• Management system and scheme documentation

  Procedures, scheme plan and statistical design templates, homogeneity and stability protocols and report formats, built on Sterling's template sets with your team.

• Effivity ISO & GRC software

  Your PT provider management system runs in Effivity from day one, included with the engagement at no additional cost.

• Training for everyone

  Internal auditor training, as applicable to your standard, for the people who will audit the provider, plus preferential Sterling Academy access, including complimentary awareness training for your people as part of the engagement.

• Internal audit and management review

  Conducted or facilitated as agreed, following a round from contract to report as well as the management system, with findings closed before the assessors arrive.

• Assessment readiness and support

  Preparation for the document review, any preliminary visit and the assessment itself, and support until the body decides.

Accreditation decisions remain with the independent accreditation body.

How we deliver

How Sterling supports your ISO/IEC 17043 implementation

Every ISO/IEC 17043 engagement runs on Sterling OS™, our delivery operating system: five phases, each with defined deliverables, decision owners and evidence. You choose how much support fits your team's capacity; the method, the software and the accountability do not change.

1. 01
   Design™Guided implementation: your scheme coordinators and statisticians do the work with Sterling's structure, templates, workshops and coaching.
2. 02
   Drive™Fully managed consulting: Sterling consultants take on the agreed documentation, statistical design review and evidence work alongside your team.
3. 03
   Sustain™Post-accreditation operation: surveillance preparation, internal audits, review of round outcomes and training for new staff, year after year.
4. 04
   Automate™The management system in Effivity: documents, records, competence and authorisations, external providers, risks, complaints, appeals, audits, actions and management review in one workspace.
5. 05
   Revise™Scope extensions, changes in the body's rules, and future editions of ISO/IEC 17043 or the standards it relies on.

Before work starts we agree the engagement team, a weekly working session, the deliverables and who decides what. Progress is reviewed against them, so a round that will not be ready shows up in month two, not in the assessment report.

Often combined with

Standards organisations pair with ISO/IEC 17043

• CAP accreditationCAP accreditation readiness for laboratories: checklist gap analysis, method records, self-inspection and peer inspection support.
• ISO 10012ISO 10012 Measurement Management certification consulting: measurement processes and equipment controlled for valid results, ready for a certification audit.
• ISO 14065ISO 14065 accreditation and requirements for bodies verifying environmental information: GHG statements, footprints, the route, cost and timing factors.
• ISO 15189ISO 15189 accreditation consulting for medical laboratories: quality and competence for reliable, timely results, prepared for the accreditation assessment.
• ISO 15190ISO 15190 laboratory safety for medical labs: gap and risk assessment, procedures, training and internal audit alongside ISO 15189.
• ISO 17034ISO 17034 accreditation consulting for reference material producers: competence and consistent operation evidenced and prepared for accreditation assessment.