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====== ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories =====

ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories is the main ISO/IEC standard used by testing and calibration laboratories. In most countries, ISO/IEC 17025 is the standard for which most labs must hold accreditation in order to be deemed technically competent. In many cases, suppliers and regulatory authorities will not accept test or calibration results from a lab that is not accredited. Originally known as ISO/IEC Guide 25, ISO/IEC 17025 was initially issued by ISO/IEC in 1999. There are many commonalities with the ISO 9000 standard, but ISO/IEC 17025 is more specific in requirements for competence and applies directly to those organizations that produce testing and calibration results and is based on somewhat more technical principles. Laboratories use ISO/IEC 17025 to implement a quality system aimed at improving their ability to consistently produce valid results. It is also the basis for accreditation from an accreditation body.


[[https://en.wikipedia.org/wiki/ISO/IEC_17025|
ISO/IEC 17025]]

ISO/IEC 17025 is an international standard that sets out the general requirements for the competence of testing and calibration laboratories. During an ISO/IEC 17025 assessment, various topics are evaluated to determine the compliance and effectiveness of a laboratory's quality management system. Some of the key assessment topics include:

1. Management System: Assessment of the laboratory's quality management system, including its documentation, policies, procedures, organizational structure, and responsibilities.

ISO 17025 is an international standard that specifies the general requirements for the competence, impartiality, and consistent operation of testing and calibration laboratories. The standard focuses on the management and technical aspects of laboratory operations to ensure reliable and accurate results.

Assessing a laboratory's quality management system (QMS) in accordance with ISO 17025 involves a thorough evaluation of various elements. Here are the key areas that should be assessed:

1. Documentation: Review the laboratory's documented quality manual, policies, procedures, and work instructions. Ensure that these documents are up to date, reflect the laboratory's actual practices, and are accessible to all relevant personnel.

2. Organizational Structure: Evaluate the laboratory's organizational structure to determine if it supports effective communication, clearly defines roles and responsibilities, and provides adequate resources for quality management.

3. Management Commitment: Assess the laboratory's management commitment to quality by reviewing their involvement, leadership, and support for the implementation of the QMS. This includes their establishment of quality objectives and their commitment to continual improvement.

4. Resource Management: Evaluate the laboratory's allocation of resources, such as personnel, infrastructure, equipment, and facilities, to ensure they are adequate for achieving quality objectives and performing accurate testing or calibration.

5. Competence of Personnel: Verify that laboratory personnel possess the necessary education, training, skills, and experience to perform their assigned tasks competently. This may involve reviewing records of qualifications, certifications, and training programs.

6. Measurement Uncertainty: Assess the laboratory's approach to estimating and reporting measurement uncertainty associated with test or calibration results. Verify that appropriate methods and procedures are followed to ensure reliable and accurate measurements.

7. Equipment and Calibration: Evaluate the laboratory's equipment management program, including equipment selection, calibration, maintenance, and verification procedures. Verify that equipment is properly maintained, calibrated, and traceable to international standards.

8. Internal Audits and Management Reviews: Review records of internal audits conducted within the laboratory to assess the effectiveness of the QMS. Additionally, evaluate the laboratory's management review process to ensure that it includes a systematic evaluation of the QMS's performance and opportunities for improvement.

9. Nonconformities and Corrective Actions: Examine the laboratory's procedures for identifying, documenting, and addressing nonconformities. Verify that appropriate corrective and preventive actions are implemented to address identified issues and prevent their recurrence.

10. Data Management and Reporting: Assess the laboratory's procedures for data management, including data integrity, confidentiality, and traceability. Verify that test or calibration reports are accurate, complete, and issued in a timely manner.

During the assessment, auditors typically conduct interviews, document reviews, and observations to evaluate the laboratory's compliance with ISO 17025 requirements. The findings of the assessment are documented in an audit report, which identifies any nonconformities and provides recommendations for improvement. The laboratory can then take corrective actions to address the identified areas of improvement and maintain or enhance its quality management system.



2. Personnel Competence: Evaluation of the competence and qualifications of laboratory personnel, including their education, training, skills, and experience relevant to the testing and calibration activities.

ISO/IEC 17025 is an international standard that specifies the general requirements for the competence of testing and calibration laboratories. One of the key requirements outlined in ISO/IEC 17025 is personnel competence, which focuses on evaluating the qualifications and abilities of laboratory personnel involved in testing and calibration activities.

The personnel competence requirement of ISO/IEC 17025 emphasizes that laboratory staff should possess the necessary education, training, skills, and experience to perform their assigned tasks competently. Here are some important aspects related to personnel competence as per the standard:

1. Education: Laboratory personnel should have the appropriate educational background and qualifications relevant to their respective roles. This typically includes academic degrees or certifications in relevant scientific or technical fields.

2. Training: Personnel should receive ongoing training to enhance their knowledge and skills. The laboratory should establish a training program that addresses the specific needs of its staff and ensures their competence in performing testing and calibration activities.

3. Skills: Laboratory personnel should possess the practical skills required to carry out their assigned tasks effectively. This involves hands-on proficiency in using laboratory equipment, conducting tests, calibrating instruments, and analyzing results.

4. Experience: The standard recognizes the importance of practical experience in developing personnel competence. Laboratory staff should have relevant experience in conducting similar tests or calibrations, working with specific methodologies, and interpreting results.

5. Job Descriptions: Each staff member should have a clear job description that outlines their roles and responsibilities. This helps ensure that personnel are appropriately assigned tasks based on their competence and expertise.

6. Competence Assessment: The laboratory should have a systematic process for assessing the competence of its personnel. This may involve evaluating their knowledge, skills, and performance through tests, practical demonstrations, proficiency testing, and other methods.

7. Continuing Professional Development: ISO/IEC 17025 encourages laboratories to promote continuous learning and professional development among their personnel. This includes attending relevant conferences, workshops, and training programs to stay updated with the latest developments in their field.

By addressing the personnel competence requirements of ISO/IEC 17025, laboratories can ensure that their staff members are qualified, trained, and experienced to carry out testing and calibration activities effectively and produce reliable results.


**3. Equipment and Calibration: Assessment of the laboratory's equipment, calibration procedures, and traceability to national or international standards. This includes verifying that the equipment is fit for purpose and properly maintained.**


ISO 17025 is an international standard that specifies the general requirements for the competence of testing and calibration laboratories. One of the key sections of ISO 17025 focuses on equipment and calibration. This section, known as Clause 6, outlines the requirements for assessing a laboratory's equipment, calibration procedures, and traceability to national or international standards. 

Here are some key points related to equipment and calibration in ISO 17025:

1. Equipment Selection: The laboratory should have a documented process for selecting equipment appropriate for the tests and calibrations they perform. This includes considering factors such as accuracy, reliability, suitability, and any specific requirements of the relevant standards or methods.

2. Equipment Verification: The laboratory needs to have procedures in place to ensure that the equipment used for testing and calibration is fit for its intended purpose. This involves conducting regular checks, inspections, and functional verifications to confirm that the equipment is operating correctly and within specified tolerances.

3. Calibration Procedures: ISO 17025 requires laboratories to establish and maintain procedures for the calibration of equipment. These procedures should specify the calibration methods, standards, and reference materials used, as well as the frequency of calibration. The calibration procedures should be based on recognized methods and standards.

4. Traceability: The standard emphasizes the importance of traceability to national or international standards. The laboratory should have a documented process to ensure that the measurement results are traceable to recognized standards. This involves establishing a calibration hierarchy that links the laboratory's equipment to higher-level standards, with documented records of traceability.

5. Maintenance and Repair: Laboratories must have procedures in place to ensure that equipment is properly maintained and, if necessary, repaired. This includes regular preventive maintenance, calibration adjustments, and repair activities. The laboratory should also keep records of maintenance and repair activities.

6. Uncertainty of Measurement: ISO 17025 requires laboratories to consider and estimate the uncertainty of measurement for the equipment used. Uncertainty is a measure of the doubt associated with the measurement result. The laboratory should evaluate and document the sources of uncertainty and take them into account when reporting results.

Compliance with the requirements related to equipment and calibration in ISO 17025 helps ensure that laboratories produce accurate and reliable test and calibration results. By following these requirements, laboratories demonstrate their competence and commitment to quality in their testing and calibration activities.


**4. Measurement Uncertainty: Evaluation of the laboratory's understanding and application of measurement uncertainty, including the estimation, calculation, and reporting of measurement uncertainty associated with test results.**

ISO 17025 is an international standard that specifies the general requirements for the competence of testing and calibration laboratories. One of the key aspects covered by ISO 17025 is the evaluation of measurement uncertainty. Measurement uncertainty is the parameter that characterizes the dispersion of the values attributed to a measured quantity.

Under the ISO 17025 standard, laboratories are required to demonstrate their understanding and application of measurement uncertainty. This involves several elements:

1. **Estimation of Measurement Uncertainty:** Laboratories must identify and evaluate all significant sources of uncertainty that affect the measurement process. This includes considering factors such as equipment limitations, environmental conditions, calibration standards, and operator proficiency. By assessing these sources, laboratories can estimate the uncertainty associated with their measurements.

2. **Calculation of Measurement Uncertainty:** Once the sources of uncertainty have been identified, laboratories need to quantify the individual contributions of each source and combine them to determine the overall measurement uncertainty. This is typically done using statistical methods, such as the "GUM" (Guide to the Expression of Uncertainty in Measurement) or other relevant approaches.

3. **Reporting of Measurement Uncertainty:** ISO 17025 requires laboratories to report measurement uncertainty along with the test results. The reported uncertainty should be expressed in a way that is both relevant and meaningful to the intended users of the test results. This may involve providing the uncertainty as an expanded uncertainty interval or as a coverage factor multiplied by the standard deviation.

By evaluating the laboratory's understanding and application of measurement uncertainty, ISO 17025 ensures that the reported test results are accompanied by an indication of their reliability. This helps users of the laboratory's services make informed decisions based on the measurement data provided.

It's important to note that ISO 17025 provides a framework for the evaluation of measurement uncertainty, but it does not prescribe specific numerical criteria for acceptable uncertainty levels. The standard allows laboratories to define their own performance criteria based on the nature of the tests they conduct and the needs of their customers.

**5. Sampling: Assessment of the laboratory's sampling procedures to ensure they are appropriate, representative, and documented.**

ISO 17025 is an international standard that specifies the general requirements for the competence of testing and calibration laboratories. In the context of ISO 17025, the assessment of sampling procedures is an important aspect of laboratory quality management.

Sampling refers to the process of selecting a subset of a population or material for testing or analysis. It is crucial to ensure that the sampling procedures used by a laboratory are appropriate, representative, and properly documented. Here's a breakdown of the key considerations related to sampling in ISO 17025:

1. Appropriate sampling procedures: The laboratory should have established procedures for sampling that are suitable for the specific type of testing or calibration being performed. These procedures should take into account relevant factors such as the nature of the sample, the purpose of the analysis, and any applicable regulatory requirements or industry standards.

2. Representative sampling: The sampling procedures should aim to obtain a representative sample that accurately reflects the characteristics of the larger population or material being tested. This requires careful consideration of factors such as the location and timing of sampling, as well as any potential sources of bias or variability.

3. Documentation: ISO 17025 emphasizes the importance of documentation throughout the laboratory's operations. Regarding sampling, the laboratory should maintain records that demonstrate the implementation of appropriate sampling procedures. This includes details such as the sampling method used, the rationale for the sampling plan, the identification of the person responsible for sampling, and any deviations or modifications to the standard procedures.

4. Quality control: The laboratory should establish quality control measures to ensure the reliability and accuracy of the sampling process. This may involve the use of certified reference materials, participation in inter-laboratory comparison programs, or the implementation of statistical techniques to evaluate the representativeness of samples.

5. Training and competence: Personnel involved in sampling activities should be adequately trained and competent in the specific sampling techniques applicable to their work. The laboratory should have procedures in place to verify the competence of staff involved in sampling and provide appropriate training or retraining as needed.

By assessing the laboratory's sampling procedures in accordance with ISO 17025, it ensures that the samples collected are appropriate, representative, and documented, which contributes to the overall quality and reliability of the laboratory's testing and calibration results.

**6. Test and Calibration Methods: Review of the laboratory's test and calibration methods to ensure they are valid, reliable, and fit for purpose. This includes verifying that the methods are properly documented, validated, and implemented.**

In ISO 17025, which is the international standard for testing and calibration laboratories, Clause 6 focuses on the review of test and calibration methods. This clause ensures that the laboratory's methods are valid, reliable, and appropriate for the intended purpose. The aim is to verify that the methods are properly documented, validated, and implemented within the laboratory's quality management system.

Here are the key points covered in this clause:

1. **Method review**: The laboratory should have a process in place to review its test and calibration methods. This review ensures that the methods are suitable for achieving accurate and reliable results. The laboratory should consider factors such as the method's scope, relevance, and appropriateness for the required measurements.

2. **Documentation**: The laboratory needs to document the test and calibration methods used. This documentation should include all relevant information about the methods, such as procedures, instructions, specifications, and any associated equipment or software requirements. The documentation should be readily available and up to date.

3. **Method validation**: The laboratory should perform method validation to demonstrate the suitability and reliability of the methods. Method validation involves confirming that the chosen method is capable of producing accurate and precise results under specific conditions. The validation process typically includes assessing method performance, evaluating measurement uncertainty, and verifying the method's limitations.

4. **Implementation**: The laboratory should ensure that the validated methods are effectively implemented within its operations. This includes providing appropriate training to personnel involved in using the methods, maintaining the necessary equipment and infrastructure, and following the documented procedures consistently.

5. **Review of changes**: Any changes to test and calibration methods should be thoroughly reviewed before implementation. The laboratory should assess the impact of the changes on the validity and reliability of the results and determine if revalidation or recalibration is necessary. Changes should be properly documented and communicated to relevant personnel.

By reviewing the test and calibration methods, documenting them adequately, validating their performance, and ensuring proper implementation, laboratories can ensure the accuracy and reliability of their results. This ultimately helps to maintain confidence in the laboratory's competence and the quality of its testing and calibration services.


**7. Quality Control: Examination of the laboratory's quality control procedures, including the use of reference materials, proficiency testing, inter-laboratory comparisons, and internal quality control measures.**

ISO/IEC 17025 is an international standard that sets out the general requirements for the competence of testing and calibration laboratories. Quality control is an essential aspect of ISO/IEC 17025, and it includes the examination of the laboratory's quality control procedures. Here are some key components related to quality control in ISO/IEC 17025:

1. Reference materials: The laboratory should have procedures in place for selecting and using appropriate reference materials. Reference materials are used to calibrate measurement instruments or validate test results. They provide a known and consistent value for a particular property or substance, allowing the laboratory to verify the accuracy of its measurements.

2. Proficiency testing: Proficiency testing involves the participation of the laboratory in external testing programs to assess its performance. These programs are conducted by external organizations, which provide samples to the laboratory for testing. The laboratory performs the tests and reports the results back to the program organizer. The organizer evaluates the laboratory's performance by comparing its results with those of other participating laboratories. Proficiency testing helps identify potential areas of improvement and ensures the laboratory's competence in delivering accurate and reliable results.

3. Inter-laboratory comparisons: Inter-laboratory comparisons involve the laboratory's participation in exercises where multiple laboratories analyze the same sample. The results obtained by different laboratories are compared to assess the level of agreement and identify any discrepancies. Inter-laboratory comparisons help identify systematic errors, bias, or inconsistencies between different laboratories and promote the improvement of measurement processes.

4. Internal quality control measures: The laboratory should establish and implement internal quality control measures to monitor the accuracy and reliability of its testing or calibration activities. These measures typically include the use of control samples, regular calibration of equipment, verification of measurement procedures, and the implementation of quality control charts. Control samples with known values are used to monitor the performance of the laboratory's measurement processes. Calibration of equipment ensures that instruments are accurate and traceable to national or international standards. Verification of measurement procedures involves checking the reliability and validity of the laboratory's testing or calibration methods. Quality control charts are used to monitor and detect any shifts or trends in the laboratory's measurement performance over time.

By examining these quality control procedures, ISO/IEC 17025 ensures that a laboratory operates with a systematic approach, maintains accuracy and reliability in its test results, and continually improves its processes to meet the requirements of customers and regulatory authorities.

**8. Reporting of Results: Assessment of the laboratory's procedures for recording, analyzing, approving, and reporting test and calibration results. This includes checking for accuracy, completeness, and traceability of results.**

ISO 17025 is an international standard that specifies the general requirements for the competence of testing and calibration laboratories. One of the key elements of ISO 17025 is the reporting of results, which is addressed in clause 8 of the standard. This clause focuses on the assessment of the laboratory's procedures for recording, analyzing, approving, and reporting test and calibration results, with a specific emphasis on accuracy, completeness, and traceability of results. Let's explore this further.

1. **Recording of Results:** The laboratory should have established procedures for accurately recording the results obtained during testing or calibration. This includes documenting the raw data, observations, measurements, calculations, and any other relevant information necessary for reporting the results.

2. **Analysis of Results:** The laboratory needs to have appropriate methods and procedures in place to analyze the recorded data and transform it into meaningful test or calibration results. This involves applying relevant statistical techniques, data evaluation, and interpretation to ensure the accuracy and reliability of the reported results.

3. **Approval of Results:** There should be a defined process for approving the test or calibration results before they are released. This typically involves a review by authorized personnel, such as technical experts or supervisors, to ensure that the results meet the required quality standards and are consistent with the laboratory's established procedures.

4. **Reporting of Results:** The laboratory should have a systematic approach for preparing reports that accurately present the test or calibration results. The reports should provide clear and concise information, including the test or calibration methods used, any applicable measurement uncertainties, and any specific conditions or limitations associated with the results.

5. **Accuracy of Results:** The laboratory must have mechanisms in place to verify the accuracy of the reported results. This includes calibration of measurement equipment, participation in proficiency testing, interlaboratory comparisons, and other quality control measures to ensure that the reported results are reliable and traceable.

6. **Completeness of Results:** The laboratory needs to ensure that the reported results include all relevant information necessary for their interpretation and understanding. This includes documenting any deviations from the test or calibration procedures, any abnormal or unexpected observations, and any additional information that may be relevant for the end-users of the results.

7. **Traceability of Results:** The laboratory should establish and maintain traceability of measurement results by ensuring that measurement standards and reference materials used in the testing or calibration process are themselves traceable to internationally recognized standards. This ensures that the reported results can be linked to a known reference point, providing confidence in their accuracy and reliability.

In summary, clause 8 of ISO 17025 focuses on assessing the laboratory's procedures for accurately recording, analyzing, approving, and reporting test and calibration results. The aim is to ensure the accuracy, completeness, and traceability of the reported results, thereby enhancing the overall quality and reliability of the laboratory's testing and calibration services.


**9. Complaints and Non-Conformities: Evaluation of the laboratory's procedures for handling customer complaints, non-conformities, and corrective actions. This includes reviewing the effectiveness of the laboratory's corrective and preventive actions.**

ISO/IEC 17025 is an international standard that specifies the general requirements for the competence of testing and calibration laboratories. Clause 9 of ISO/IEC 17025 focuses on the evaluation of the laboratory's procedures for handling customer complaints, non-conformities, and corrective actions. The aim is to ensure that the laboratory has effective processes in place to address any issues that may arise and to prevent their recurrence.

The evaluation of the laboratory's procedures for complaints and non-conformities involves several key aspects:

1. Customer Complaints: The laboratory should have a well-defined process for receiving, documenting, and addressing customer complaints. This includes establishing clear channels of communication for customers to submit their complaints, maintaining records of complaints received, and promptly investigating and responding to each complaint. The effectiveness of the laboratory's procedures for handling customer complaints should be evaluated to ensure that they are being addressed in a timely and satisfactory manner.

2. Non-Conformities: Non-conformities refer to instances where the laboratory's activities or results do not meet the specified requirements. The laboratory should have a systematic approach to identify, document, and evaluate non-conformities. This involves conducting thorough investigations to determine the root cause of the non-conformity and taking appropriate corrective actions to prevent its recurrence. The laboratory's procedures for identifying and addressing non-conformities should be reviewed to ensure their effectiveness.

3. Corrective and Preventive Actions: The laboratory should have documented procedures for implementing corrective and preventive actions. Corrective actions are taken to address existing non-conformities, while preventive actions are aimed at identifying and eliminating the causes of potential non-conformities. The laboratory's procedures for initiating, implementing, and monitoring the effectiveness of corrective and preventive actions should be evaluated to ensure they are robust and consistently applied.

During the evaluation, the laboratory's compliance with the requirements of ISO/IEC 17025, as well as any additional applicable regulations or standards, should be assessed. The effectiveness of the laboratory's procedures for handling complaints and non-conformities should be measured based on factors such as timeliness, thoroughness of investigations, adequacy of corrective actions, and evidence of preventive measures.

Regular internal audits and management reviews should be conducted to assess the performance of the laboratory's procedures for handling complaints and non-conformities. The findings from these audits and reviews can be used to identify areas for improvement and to implement necessary changes to enhance the effectiveness of the laboratory's quality management system.

**10. Data Management: Review of the laboratory's data management procedures, including data integrity, confidentiality, protection against loss or damage, and backup processes.**

ISO/IEC 17025 is an international standard that specifies the general requirements for the competence of testing and calibration laboratories. The standard covers various aspects of laboratory operations, including data management. In section 10, "Data Management," ISO/IEC 17025 requires a review of the laboratory's data management procedures. Here are some key points related to this requirement:

1. Data Integrity: The laboratory should have procedures in place to ensure the integrity of the data generated during testing or calibration activities. This includes measures to prevent unauthorized access, alteration, or deletion of data. The laboratory should have controls in place to detect and prevent any unauthorized changes to data.

2. Confidentiality: The laboratory should establish procedures to protect the confidentiality of client data and ensure that it is only accessed by authorized personnel. This may include password protection, encryption, or other security measures to prevent data breaches.

3. Protection against loss or damage: The laboratory should have measures to protect data from loss or damage. This may involve regular backups of data, use of redundant storage systems, or other means of data protection. The laboratory should also have procedures to recover data in the event of loss or damage.

4. Backup processes: The laboratory should have documented procedures for regularly backing up data to ensure its availability and prevent loss. The backup processes should include the frequency of backups, storage locations, and methods used for data backup. It is important to periodically test the data restoration process to ensure its effectiveness.

During the assessment against ISO/IEC 17025, the accreditation body or auditing entity will review the laboratory's data management procedures to ensure compliance with these requirements. This may involve examining documented procedures, interviewing laboratory personnel, and inspecting the systems and infrastructure used for data management.

By complying with ISO/IEC 17025 requirements for data management, laboratories can demonstrate their commitment to producing reliable and accurate results, maintaining data integrity, and protecting client confidentiality.


**11. Facilities and Environment: Assessment of the laboratory's physical facilities, environmental conditions, and safety measures to ensure they are suitable for the intended testing and calibration activities.**

ISO/IEC 17025 is an international standard that specifies the general requirements for the competence, impartiality, and consistent operation of testing and calibration laboratories. Within ISO/IEC 17025, Clause 5 specifically addresses the requirements for "Facilities and Environment." This clause focuses on assessing the laboratory's physical facilities, environmental conditions, and safety measures to ensure they are suitable for the intended testing and calibration activities.

Here are some key points related to Clause 5 of ISO/IEC 17025:

1. Physical Facilities: The laboratory must have adequate physical facilities to support its testing and calibration activities. This includes having appropriate space for conducting tests and calibrations, as well as areas for sample preparation, storage, and equipment maintenance. The facilities should be designed in a way that minimizes the risk of errors, contamination, or cross-contamination.

2. Environmental Conditions: The laboratory should establish and maintain suitable environmental conditions to ensure the accuracy and reliability of its testing and calibration results. This includes controlling factors such as temperature, humidity, and lighting, as they can affect the performance of equipment, samples, and measurements. The laboratory should monitor and document these conditions to ensure they are within acceptable ranges.

3. Safety Measures: Laboratories must implement appropriate safety measures to protect personnel, equipment, and the integrity of testing and calibration activities. This involves identifying and addressing potential hazards, providing safety equipment, and establishing procedures for handling hazardous materials or substances. Safety training and awareness programs should also be in place to ensure staff members are knowledgeable and compliant with safety protocols.

4. Equipment and Infrastructure: The laboratory must have appropriate equipment, instruments, and infrastructure to support its testing and calibration activities. This includes ensuring that the equipment is suitable for the intended purpose, properly calibrated, and maintained. The laboratory should establish procedures for equipment selection, verification, and maintenance, as well as contingency plans in case of equipment failures.

5. Contamination Control: Laboratories should have measures in place to prevent contamination or cross-contamination of samples, materials, and equipment. This may involve implementing procedures for sample handling, cleaning protocols, and the use of appropriate protective clothing or personal protective equipment (PPE). Contamination control is crucial to maintaining the integrity and reliability of test and calibration results.

6. Documented Procedures: The laboratory should have documented procedures for managing its facilities and environment. These procedures should outline how the laboratory assesses, maintains, and controls its physical facilities, environmental conditions, and safety measures. Documented procedures provide guidance to laboratory personnel and ensure consistency in operations.

Compliance with the requirements of Clause 5 of ISO/IEC 17025 demonstrates that the laboratory has taken the necessary steps to provide a suitable and safe environment for conducting testing and calibration activities. By meeting these requirements, the laboratory enhances the reliability and quality of its results, instilling confidence in its clients and stakeholders.

**12. Internal Audits: Verification of the laboratory's internal audit program, including the frequency and effectiveness of internal audits, as well as the follow-up on identified non-conformities.**


ISO 17025 is an international standard that specifies the general requirements for the competence, impartiality, and consistent operation of testing and calibration laboratories. Clause 12 of ISO 17025 focuses on internal audits, which are an essential part of maintaining compliance with the standard.

Internal audits serve as a means to verify the effectiveness of the laboratory's quality management system (QMS), including its internal audit program. The purpose of internal audits is to assess whether the laboratory's operations and practices comply with the requirements of ISO 17025 and its own established procedures.

Here are the key aspects covered in Clause 12 of ISO 17025 related to internal audits:

1. Internal Audit Program: The laboratory must have a documented internal audit program in place. This program outlines the frequency and scope of internal audits to be conducted within the laboratory. The program should consider the size and complexity of the laboratory's activities, as well as the risks associated with its operations.

2. Frequency of Internal Audits: The laboratory should establish a schedule for conducting internal audits. The frequency of internal audits may vary depending on the laboratory's size, complexity, and the importance of the activities being audited. The goal is to ensure that all aspects of the laboratory's QMS are audited at regular intervals.

3. Effectiveness of Internal Audits: The internal audit program should be designed to assess the effectiveness of the laboratory's QMS and identify areas for improvement. Auditors, who can be internal or external to the laboratory, should be competent and impartial. They should have the necessary knowledge and skills to conduct audits effectively.

4. Non-Conformities and Follow-up: During internal audits, any non-conformities, or deviations from the requirements of ISO 17025 or the laboratory's own procedures, should be identified. These non-conformities must be documented and communicated to the appropriate personnel responsible for corrective action. The laboratory should have a process in place to ensure that non-conformities are addressed and resolved effectively.

5. Records of Internal Audits: The laboratory should maintain records of internal audits, including the scope, dates, auditors, findings, and actions taken to address non-conformities. These records provide evidence of compliance with ISO 17025 requirements and serve as a reference for future audits and assessments.

By conducting internal audits, a laboratory can evaluate the effectiveness of its QMS, identify areas for improvement, and ensure compliance with ISO 17025. The findings from internal audits help drive continuous improvement within the laboratory and enhance the quality and reliability of its testing or calibration services.


These are some of the main topics that are assessed during an ISO/IEC 17025 evaluation. The specific assessment areas may vary depending on the scope of accreditation and the nature of the laboratory's activities.