Review of Requests and Selection of Methods

Let’s start where every testing or calibration project begins—with a request from a client. According to the Requirements of ISO/IEC 17025 2017, the lab can’t just accept a job and dive in. First, it has to make sure it fully understands what the client is asking for—and confirm it can actually do the work correctly and reliably.

This is laid out in Clause 7.1, and it’s all about communication, clarity, and capability.

Here’s what labs are expected to do:

• Review the request, tender, or contract to understand the requirements

• Confirm that the lab has the right methods, resources, and staff to perform the work

• Resolve any unclear or conflicting information with the client

• Document any differences or changes from the original agreement

Why is this such a big deal? Because even a small misunderstanding—like which method to use or the type of results needed—can cause delays, rework, or inaccurate results. That’s why the Requirements of ISO/IEC 17025 2017 make this initial review a formal, traceable step in your process.

Once everything is clear and agreed upon, the next task is method selection, which is covered under Clause 7.2. The Requirements of ISO/IEC 17025 2017 expect labs to use methods that are appropriate and validated for the task at hand. In most cases, this means using internationally recognized standards (like ISO, ASTM, or EPA methods). But if a standard method doesn’t exist—or if you’re using a modified or lab-developed method—you’ll need to verify or validate it.

This part of the process ensures the method will actually work in your specific lab conditions, with your equipment and personnel. Again, it’s all about reliability and consistency.

So, to sum it up:

• Don’t assume—always review requests in detail

• Choose methods that are appropriate, validated, and clearly documented

• If methods are new or non-standard, validate them before use

By following these early-stage Requirements of ISO/IEC 17025 2017, labs can prevent confusion, avoid errors, and build a solid foundation for the rest of the testing or calibration process. And that’s exactly what this standard is designed to do—help you get it right from the very beginning.

Sampling, Handling of Items, and Technical Records

Once the method is selected and confirmed, it’s time to get hands-on. Whether you’re testing water, food, chemicals, or mechanical parts, how you handle the actual test items is a big deal—and the Requirements of ISO/IEC 17025 2017 are very clear about what’s expected.

Let’s start with sampling. If your lab is responsible for taking the sample (instead of just receiving it), Clause 7.3 kicks in. The standard says your sampling plan needs to be documented and repeatable. In other words, someone else in your lab should be able to follow your procedure and get the same type of sample, under the same conditions.

Here’s what that usually involves:

• Clear instructions on how and where to sample

• How much to take and what equipment to use

• How to avoid contamination or changes during sampling

• How to label and store the sample until it’s tested

Next up is handling of test and calibration items, covered under Clause 7.4. This part of the Requirements of ISO/IEC 17025 2017 makes sure that nothing happens to the sample that could affect your results. That means storing it at the right temperature, protecting it from damage, and making sure it’s clearly labeled and traceable at every step.

If a sample is lost, damaged, or doesn’t meet acceptance criteria when it arrives, your lab needs to have a clear procedure for what to do next—and keep a record of it.

And speaking of records, that brings us to Clause 7.5: technical records. According to the Requirements of ISO/IEC 17025 2017, labs need to record everything that could influence the validity of their results. That includes:

• Raw data and calculations

• Equipment used

• Environmental conditions (when relevant)

• Any observations or deviations

• Who performed the work and when

All of this needs to be traceable and protected from accidental changes or loss. Whether you use paper forms, spreadsheets, or a lab information system, your records need to be complete, accurate, and accessible when needed.

So, to sum it up: the Requirements of ISO/IEC 17025 2017 expect your lab to handle samples with care, follow documented sampling methods, and maintain solid technical records. These are the behind-the-scenes actions that ensure every result your lab produces is based on a clear, traceable chain of events—and that’s the kind of trust your clients (and auditors) count on.

Measurement Uncertainty, Validity of Results, and Reporting

Now let’s talk about the part of lab work that often sounds complicated—but is actually pretty logical once you break it down: measurement uncertainty, validity checks, and reporting results. These are all covered in Clauses 7.6 to 7.8 of the Requirements of ISO/IEC 17025 2017, and they’re essential for making sure your test or calibration results can be trusted.

Understanding Measurement Uncertainty

Let’s say you measure something and report a value of 10.00. Is that number exact? Not quite. There’s always some level of variation or doubt—even in the best labs. That’s what measurement uncertainty is all about: estimating how much variation could reasonably exist around your result.

According to the Requirements of ISO/IEC 17025 2017, labs must evaluate and document this uncertainty wherever it’s relevant. This doesn’t mean guessing—it means using real data, like repeatability, instrument precision, and environmental factors, to build a reasonable estimate.

This is especially important when clients use your results to make decisions. If you’re measuring something against a specification or limit, understanding uncertainty can affect whether it passes or fails.

Ensuring the Validity of Results

Clause 7.7 focuses on making sure the results you’re reporting are valid and consistently accurate. The Requirements of ISO/IEC 17025 2017 ask labs to put ongoing quality checks in place. This could include:

• Using control charts

• Retesting samples at intervals

• Participating in interlaboratory comparisons or proficiency testing

• Running reference or check standards regularly

These aren’t just nice-to-have practices—they’re essential tools to confirm that your methods, equipment, and staff are all performing the way they should. If something drifts or fails, you can catch it before the wrong result is reported to a client.

Clear and Accurate Reporting

Once the testing or calibration is complete, it’s time to write the report—and Clause 7.8 has very specific instructions. According to the Requirements of ISO/IEC 17025 2017, every report should be clear, complete, and meaningful to the client. It should include:

• Identification of the item tested

• The method used

• The results (with units)

• Measurement uncertainty (if required)

• Date, name of the responsible person, and signature

• Any deviations from the standard procedure

If you’re reporting a pass/fail result or a statement of conformity, you also need to apply a decision rule—which means explaining how uncertainty is factored into that judgment.

All of these steps help your lab meet the Requirements of ISO/IEC 17025 2017 not just by following the rules, but by delivering results that clients can rely on. It’s about turning technical work into something clear, confident, and credible.

Coming up next, we’ll look at what happens when things go wrong—complaints, nonconforming work, and data control. Yep, even mistakes are part of the process—and ISO 17025 has a plan for those too.

Complaints, Nonconforming Work, and Data Control

Let’s face it—things don’t always go perfectly in the lab. Maybe a client isn’t happy with a report, or a piece of equipment fails mid-test. Or maybe someone catches a small error after a result has already been sent. The good news? The Requirements of ISO/IEC 17025 2017 are designed to help you handle these situations calmly, clearly, and professionally.

Handling Complaints the Right Way

Clause 7.9 focuses on client complaints—and how your lab responds to them. The Requirements of ISO/IEC 17025 2017 expect you to have a documented process for receiving, investigating, and resolving complaints. That means:

• A clear way for clients to raise concerns

• A fair, non-defensive approach to evaluating the issue

• Keeping records of the complaint, your response, and how it was resolved

• Making sure actions taken actually fix the root cause

It’s not about assigning blame—it’s about building trust. A well-handled complaint can actually strengthen client relationships by showing how seriously your lab takes quality and transparency.

Dealing with Nonconforming Work

Clause 7.10 covers nonconforming work—which is ISO-speak for when something goes off-track. Maybe the wrong test was run, a sample was mislabeled, or a piece of equipment was out of calibration. The Requirements of ISO/IEC 17025 2017 say your lab needs to act quickly and systematically to address these issues.

Your procedure should include:

• Identifying the problem as soon as possible

• Stopping the affected work (if needed)

• Evaluating the impact of the issue

• Notifying the client if results are affected

• Taking corrective actions to prevent a repeat

Again, the focus here is control—not punishment. The standard assumes that mistakes happen, but it expects your lab to handle them responsibly and keep a record of how you corrected the situation.

Controlling Data and Information

Lastly, Clause 7.11 zooms in on how your lab manages data. The Requirements of ISO/IEC 17025 2017 expect you to make sure all data—whether it’s digital or paper—is secure, accurate, and protected from loss or tampering.

That means:

• Backing up files regularly

• Controlling access to sensitive information

• Validating software systems used for calculations or reporting

• Keeping audit trails when data is changed

Whether you’re using a full LIMS or just a well-organized spreadsheet system, what matters most is that your records are reliable and traceable. When data is well-managed, the entire lab runs more smoothly—and that’s exactly what the Requirements of ISO/IEC 17025 2017 are aiming for.

In the next section, we’ll step into Clause 8 and explore how management system requirements bring everything together to support quality from the top down.

Management System Requirements – Clause 8

Now that we’ve covered the technical side of lab operations, let’s look at the structure that holds it all together: the management system. Clause 8 of the Requirements of ISO/IEC 17025 2017 focuses on how your lab stays organized, reviews its performance, and continuously improves. This part is all about keeping your quality system healthy and effective—not just for audits, but for everyday work.

Option A vs. Option B – Two Paths to Compliance

The standard gives labs two options for how they want to structure their management system:

• Option A is a standalone quality system based purely on ISO/IEC 17025

• Option B aligns more closely with ISO 9001, for labs that are already certified or want to integrate both standards

Whichever you choose, the goal is the same: to meet the Requirements of ISO/IEC 17025 2017 by ensuring your lab’s operations are consistent, well-documented, and regularly reviewed.

Document Control, Audits, and Reviews

Clause 8.2 through 8.5 dig into the nuts and bolts of how your lab manages quality. These areas might not involve test tubes or calibration weights, but they’re just as important.

Here’s what the Requirements of ISO/IEC 17025 2017 expect:

• Control of documents and records: making sure procedures, forms, and logs are current, reviewed, and protected from accidental changes

• Internal audits: scheduled checks to make sure the system is working as intended—and to catch issues before external auditors do

• Management review: regular meetings to step back, look at the big picture, and evaluate performance, risks, and opportunities

• Continual improvement: documenting changes, collecting feedback, and using data to make meaningful upgrades to how the lab operates

These activities aren’t just for show—they’re about staying proactive. When a lab commits to ongoing review and improvement, it’s easier to catch issues early, keep clients happy, and maintain accreditation without last-minute scrambles.

And here’s the thing: all these management system steps are interconnected with everything else you do. That’s why the Requirements of ISO/IEC 17025 2017 weave them in as a core part of the standard. They ensure that what your lab does behind the scenes is just as solid as what happens on the bench.

Up next, we’ll tie everything together with some final thoughts on how understanding and applying these requirements can elevate your lab’s credibility and consistency.

Final Notes on the Requirements of ISO/IEC 17025 2017

And there you have it—a full walkthrough of the operational and management system side of the Requirements of ISO/IEC 17025 2017. From reviewing client requests and handling samples, all the way to reporting results and managing quality behind the scenes, this part of the standard really brings the big picture into focus.

By the time a lab meets all the Requirements of ISO/IEC 17025 2017, it’s not just checking boxes—it’s building a system that supports consistency, accuracy, and trust. Every test or calibration is backed by reliable methods, well-documented processes, and a quality system that knows how to identify and fix problems before they grow.

Here’s a quick recap of what we covered:

• Clause 7 dives into the technical details—methods, sampling, records, and result validity

• Clause 8 outlines the structure—how the lab stays organized, audits itself, and keeps improving

• Each requirement connects to the next, forming a strong, traceable chain from request to result

Understanding the Requirements of ISO/IEC 17025 2017 doesn’t mean memorizing every clause—it means knowing how they work together to support a lab that’s professional, transparent, and dependable.

So whether you’re preparing for accreditation, updating your quality system, or just brushing up on best practices, keeping these requirements in mind will help your lab stay sharp, confident, and audit-ready.

And remember: ISO 17025 isn’t just a standard—it’s a mindset. When you build your lab around these principles, you’re not just meeting expectations. You’re setting the bar.

Levy M.

I hold a Master’s degree in Quality Management, and I’ve built my career specializing in the ISO/IEC 17000 series standards, including ISO/IEC 17025, ISO 15189, ISO/IEC 17020, and ISO/IEC 17065.

My background includes hands-on experience in accreditation preparation, documentation development, and internal auditing for laboratories and certification bodies.

I’ve worked closely with teams in testing, calibration, inspection, and medical laboratories, helping them achieve and maintain compliance with international accreditation requirements.

I’ve also received professional training in internal audits for ISO/IEC 17025 and ISO 15189, with practical involvement in managing nonconformities, improving quality systems, and aligning operations with standard requirements.

At QSE Academy, I contribute technical content that turns complex accreditation standards into practical, step-by-step guidance for labs and assessors around the world.

I’m passionate about supporting quality-driven organizations and making the path to accreditation clear, structured, and achievable.