Good Laboratory Practice (GLP) Certification: Requirements, Process, Benefits and Compliance

Good Laboratory Practice (GLP) certification demonstrates that a test facility has been assessed against applicable GLP principles and has the systems, personnel, facilities, equipment, procedures, and records needed to conduct studies reliably.

Good Laboratory Practice (GLP) provides a structured quality system for laboratories and test facilities conducting regulated non-clinical health and environmental safety studies. It helps ensure that studies are properly planned, performed, monitored, documented, reported, and archived.

However, GLP certification should not be confused with laboratory accreditation under standards such as ISO/IEC 17025. GLP focuses primarily on the organisation and management of regulated non-clinical studies and the integrity of study data, whereas ISO/IEC 17025 focuses on the competence of testing and calibration laboratories.

In India, the National Good Laboratory Practice Compliance Monitoring Authority (NGCMA) under the Department of Science and Technology (DST), Government of India, administers the national GLP compliance monitoring programme.

What Is Laboratory Practice (GLP) Certification?

Good Laboratory Practice (GLP) certification is the formal recognition of a test facility’s compliance with applicable Good Laboratory Practice requirements.

The OECD describes GLP as a managerial quality system covering the organisational process and conditions under which non-clinical health and environmental safety studies are planned, performed, monitored, recorded, reported, and retained or archived.

A GLP-compliant facility should therefore be able to demonstrate control over areas such as:

• Organisation and personnel
• Responsibilities of management and study personnel
• Quality assurance
• Study planning
• Standard operating procedures
• Facilities
• Equipment and instruments
• Test and reference items
• Raw data
• Computerised systems
• Study reports
• Record retention and archives
• Data integrity

GLP certification is particularly important when study results will be submitted to regulatory authorities to support decisions concerning the safety of chemicals, pharmaceuticals, pesticides, veterinary products, cosmetics, food or feed additives, and other regulated products.

What Does GLP Stand For?

GLP stands for Good Laboratory Practice.

It is an internationally recognised quality system designed to promote the reliability, consistency, traceability, and integrity of data generated during regulated non-clinical studies.

The OECD GLP principles apply to areas including physical and chemical testing, toxicity studies, mutagenicity studies, environmental toxicity studies, residue studies, bioaccumulation studies, and analytical and clinical chemistry testing.

GLP does not apply to clinical trials involving human subjects. The OECD specifically describes GLP as relating to non-clinical testing.

Why Is GLP Certification Important?

Regulatory decisions often depend on laboratory data. If the data cannot be traced to reliable procedures, equipment, personnel, records, and controlled conditions, regulators may have difficulty determining whether the results are trustworthy.

GLP addresses this problem by establishing a controlled framework for generating and maintaining study data.

The major objectives of GLP include:

1. Ensuring reliable study data
2. Protecting data integrity
3. Improving traceability
4. Defining responsibilities
5. Reducing errors and undocumented changes
6. Ensuring appropriate quality assurance
7. Supporting regulatory submissions
8. Facilitating international acceptance of safety data

The OECD states that GLP principles are intended to promote the quality and validity of test data used to assess the safety of chemicals and chemical products.

GLP Certification vs GLP Compliance

These terms are sometimes used interchangeably, but they are not exactly the same.

GLP compliance

GLP compliance means that a test facility and its studies follow the applicable GLP principles.

Compliance can be evaluated through inspections and study audits conducted by an authorised GLP compliance monitoring programme.

GLP certification

GLP certification generally refers to formal recognition by the applicable national GLP compliance monitoring authority that a test facility has demonstrated compliance with the relevant GLP requirements.

The OECD explains that national GLP compliance monitoring programmes verify compliance through test-facility inspections and study audits. A facility that has been inspected and found to operate according to GLP principles can be recognised as a GLP-compliant test facility.

Therefore, it is more accurate to think of GLP certification as recognition of a test facility’s GLP compliance, rather than as a universal laboratory certificate.

Who Needs GLP Certification?

Not every laboratory needs GLP certification.

GLP is particularly relevant to test facilities conducting regulated non-clinical safety studies whose results may be submitted to regulatory authorities.

Examples include facilities conducting:

• Toxicology studies
• Mutagenicity studies
• Environmental toxicity studies
• Physical and chemical studies
• Residue studies
• Bioaccumulation studies
• Analytical studies supporting GLP safety studies
• Ecotoxicology studies
• Certain pharmaceutical safety studies
• Pesticide safety studies
• Industrial chemical safety studies
• Veterinary product safety studies
• Studies involving food and feed additives

The exact scope depends on the applicable country’s regulations and the regulatory purpose of the study.

The OECD lists pharmaceuticals, pesticides, cosmetics, veterinary drugs, food and feed additives, and industrial chemicals among the product categories for which its GLP principles may apply to non-clinical safety testing.

Is GLP Certification Mandatory?

GLP certification is not universally mandatory for every laboratory.

Whether GLP compliance is required depends on:

• The type of study
• The purpose of the study
• The regulatory authority receiving the data
• The applicable national legislation
• The product being tested
• The type of safety assessment involved

For example, a laboratory performing routine research that will never be used as regulated non-clinical safety data may not need GLP certification.

In contrast, a test facility generating regulated safety data for submission to authorities may need to work under a recognised GLP compliance programme.

In India, the NGCMA states that GLP-compliance certification is voluntary in nature, while test facilities seeking regulatory recognition for applicable safety studies may apply for GLP certification.

This distinction is important: voluntary certification does not mean GLP requirements are irrelevant when a particular regulatory submission requires GLP-compliant data.

Who Provides GLP Certification?

GLP certification is generally handled through a country’s national GLP compliance monitoring authority or another competent authority designated under its national system.

The OECD framework requires countries participating in the GLP system to establish procedures for monitoring compliance and designate appropriate authorities for these functions.

The actual organisation responsible therefore varies by country.

GLP Certification in India

In India, the National Good Laboratory Practice Compliance Monitoring Authority (NGCMA) operates under the Department of Science and Technology, Government of India.

NGCMA was established in 2002 and is responsible for monitoring GLP compliance of test facilities in India. India became a full adherent to the OECD Mutual Acceptance of Data (MAD) system in 2011.

According to DST, Indian GLP-certified test facilities generate non-clinical health and safety data that can benefit from international acceptance under the OECD MAD framework.

As reported by DST for 2024–25, India had 60 GLP-certified test facilities, including four government laboratories.

What Are the Main GLP Requirements?

A laboratory seeking GLP certification must establish a comprehensive quality system rather than simply obtaining a certificate.

The major requirements include the following.

1. Organisation and Management

The facility should have a clearly defined organisational structure.

Management must establish appropriate responsibilities and ensure that adequate resources are available to conduct studies.

Roles should be clearly defined for:

• Test facility management
• Study directors
• Principal investigators, where applicable
• Study personnel
• Quality assurance personnel
• Supporting personnel

Clear responsibilities reduce confusion and improve accountability.

2. Quality Assurance Programme

Quality assurance is one of the most important elements of GLP.

The QA function provides independent monitoring of GLP compliance within the test facility.

The OECD identifies QA as a cornerstone of the GLP system because it provides internal monitoring of both the test facility and the studies conducted there.

A QA programme may include:

• Facility inspections
• Study-based inspections
• Process inspections
• SOP reviews
• Audit of records
• Reporting of findings
• Follow-up of corrective actions
• Verification of compliance

QA personnel should have sufficient independence to perform their responsibilities effectively.

3. Personnel and Training

GLP laboratories need appropriately qualified and trained personnel.

Personnel should have:

• Appropriate education and experience
• Defined responsibilities
• Initial training
• Ongoing training
• Documented competency
• Training records

Training should cover applicable SOPs, safety requirements, equipment operation, study procedures, data recording, and GLP principles.

A laboratory should be able to demonstrate that employees performing critical activities are suitably trained.

4. Facilities

The physical layout of the facility should support the type of studies being performed.

Facilities should be designed and maintained to minimise risks such as:

• Contamination
• Cross-contamination
• Mix-ups
• Unauthorised access
• Incorrect storage
• Environmental control failures

The OECD GLP framework specifically considers the suitability of facilities and equipment and includes expectations concerning the layout of testing and storage areas.

5. Equipment and Instruments

Equipment used for GLP studies must be suitable for its intended purpose.

Important controls include:

• Installation
• Identification
• Qualification, where applicable
• Calibration
• Maintenance
• Cleaning
• Inspection
• Repair
• Operating instructions
• Equipment records

Calibration and maintenance records should be controlled and readily traceable.

If an instrument fails or produces questionable results, the laboratory should have a documented process for evaluating the potential effect on study data.

6. Standard Operating Procedures

Standard Operating Procedures, or SOPs, are fundamental to GLP.

SOPs should describe how routine and critical activities are performed.

Examples include SOPs for:

• Equipment operation
• Calibration
• Cleaning
• Sample handling
• Test item handling
• Data recording
• Computerised systems
• Deviations
• Investigations
• Quality assurance
• Archiving
• Waste disposal

SOPs should be approved, controlled, periodically reviewed, and available to the personnel who need them.

7. Test and Reference Items

GLP requires appropriate control of test items and reference items.

The facility should have procedures covering:

• Receipt
• Identification
• Labelling
• Sampling
• Characterisation
• Storage
• Handling
• Distribution
• Use
• Return or disposal

The OECD has specific guidance addressing the transportation, receipt, identification, labelling, sampling, handling, storage, characterisation, archiving, and disposal of test items.

8. Study Plans

Each regulated GLP study should be properly planned before it begins.

The study plan establishes important information such as:

• Study identification
• Objectives
• Test systems
• Methods
• Test items
• Experimental design
• Measurements
• Data requirements
• Responsibilities
• Applicable procedures

Changes to the approved study plan should be documented and appropriately authorised.

9. Raw Data and Data Integrity

Data integrity is a critical GLP requirement.

Laboratories must be able to demonstrate that data are:

• Attributable
• Legible
• Contemporaneous
• Original
• Accurate
• Complete
• Consistent
• Traceable
• Secure

Electronic systems introduce additional considerations, including:

• User access
• Audit trails
• Electronic records
• Data backup
• System validation
• Security
• Change control

The OECD has dedicated guidance on GLP data integrity and recommends a risk-based approach considering data risk, criticality, and lifecycle.

10. Computerised Systems

Modern laboratories increasingly depend on electronic systems for:

• Instrument data
• Laboratory information management
• Study management
• Data analysis
• Electronic records
• Reporting
• Archiving

Computerised systems used in GLP activities therefore need appropriate controls.

The OECD has specific guidance on the application of GLP principles to computerised systems.

Controls should address areas such as validation, access control, data security, backups, audit trails, change management, and system maintenance.

11. Study Reports

The final study report should accurately describe the work performed and the resulting data.

It should provide sufficient information for the study to be understood and evaluated.

The report should be consistent with the underlying raw data and should document relevant deviations, amendments, and quality assurance activities.

12. Archives and Record Retention

GLP does not end when the final study report is issued.

Important records must be retained in a controlled archive.

Records may include:

• Study plans
• Raw data
• Final reports
• SOPs
• Amendments
• Deviations
• QA records
• Equipment records
• Training records
• Test item records
• Computerised-system records

The archive should protect records against loss, deterioration, unauthorised modification, and unauthorised access.

Laboratory Practice (GLP) Certification Process

The exact process differs between countries, but a typical GLP certification process follows several stages.

Step 1: Determine Applicability

First, determine whether the facility’s activities fall within the scope of the applicable GLP programme.

Consider:

• Type of studies
• Test substances
• Regulatory purpose
• Intended receiving authorities
• National GLP requirements

This prevents a laboratory from pursuing certification when another accreditation or regulatory framework is more appropriate.

Step 2: Define the Scope

The laboratory should identify the specific areas for which it wants GLP recognition.

For example:

The scope should accurately represent the facility’s actual capabilities.

Step 3: Perform a GLP Gap Assessment

Before applying, the laboratory should compare its existing system with the applicable GLP requirements.

A gap assessment should examine:

• Organisation
• Personnel
• QA
• Facilities
• Equipment
• SOPs
• Study management
• Test items
• Raw data
• Computerised systems
• Data integrity
• Archives

This helps identify deficiencies before the formal inspection.

Step 4: Establish the GLP Quality System

The laboratory should implement the required procedures and controls.

This may require developing or revising:

• Quality manuals
• SOPs
• Training programmes
• Equipment procedures
• Calibration programmes
• QA procedures
• Data-management procedures
• Archiving procedures
• Deviation procedures
• CAPA procedures
• Computerised-system controls

Step 5: Train Personnel

All relevant employees should understand their GLP responsibilities.

Training should not be limited to laboratory scientists.

Depending on the facility, it may include:

• Study directors
• Scientists
• Laboratory technicians
• QA personnel
• IT personnel
• Archivists
• Equipment operators
• Management

Training should be documented.

Step 6: Conduct Internal Audits

Before an external GLP inspection, the facility should conduct internal audits or mock inspections.

These audits can identify problems such as:

• Missing records
• Expired SOPs
• Incomplete training
• Calibration gaps
• Uncontrolled documents
• Data-integrity weaknesses
• Inadequate equipment records
• Poor archive controls

Corrective actions should be completed and documented.

Step 7: Submit the Application

The test facility submits its application to the applicable national GLP compliance monitoring authority.

In India, NGCMA provides documents covering the application and maintenance of GLP certification, including an application form and terms and conditions.

Step 8: GLP Inspection

The competent GLP authority evaluates the facility through an inspection.

The inspection may cover:

• Organisation
• Personnel
• Facilities
• Equipment
• SOPs
• QA programme
• Study records
• Raw data
• Archives
• Computerised systems
• Test items
• Study management

Inspectors may also conduct study audits to verify whether actual studies were conducted according to GLP requirements.

The OECD identifies inspections of test facilities and audits of studies as central components of GLP compliance monitoring.

Step 9: Corrective Actions

If deficiencies are identified, the facility may need to submit corrective actions.

A good corrective-action response should explain:

1. What was found
2. Why it occurred
3. Immediate correction
4. Root cause
5. Corrective action
6. Preventive action where appropriate
7. Responsible person
8. Completion date
9. Evidence of implementation

Simply correcting a single observation may not be enough if the underlying system remains weak.

Step 10: Certification or Recognition

After the inspection and review of the facility’s response, the competent authority determines whether the facility meets the applicable requirements.

If the requirements are satisfied, the facility can receive the relevant GLP compliance recognition or certification.

Step 11: Maintain GLP Compliance

GLP certification is not a one-time activity.

The facility must continuously maintain its GLP system.

This requires:

• Ongoing QA
• Training
• SOP review
• Equipment calibration
• Maintenance
• Internal inspections
• Data-integrity controls
• CAPA
• Management oversight
• Record retention
• Regulatory inspections

In India, NGCMA’s published information states that GLP certification is valid for three years, with surveillance inspection at approximately 18 months and re-certification inspection during the third year.

GLP Certification Requirements Checklist

A laboratory preparing for GLP certification can use the following checklist.

GLP Certification vs ISO/IEC 17025 Accreditation

A common question is whether GLP certification and ISO/IEC 17025 accreditation are the same.

They are not.

The OECD itself has published a position paper addressing the relationship between the OECD GLP principles and ISO/IEC 17025, highlighting that the two frameworks should not simply be treated as interchangeable.

A laboratory may therefore need GLP compliance, ISO/IEC 17025 accreditation, or both, depending on its activities and regulatory requirements.

Benefits of Good Laboratory Practice (GLP) certification

1. Improved Data Reliability

GLP establishes controls throughout the study lifecycle, helping laboratories generate reliable and traceable data.

2. Regulatory Confidence

GLP compliance provides regulatory authorities with evidence that studies were conducted within an established quality framework.

3. Better Data Integrity

Controlled documentation, raw data, audit trails, procedures, and QA activities strengthen data integrity.

4. International Acceptance

Participation in the OECD GLP and Mutual Acceptance of Data framework can facilitate acceptance of qualifying safety data across participating countries.

India’s full adherence to OECD MAD has helped support international acceptance of relevant data generated by Indian GLP-certified facilities.

5. Improved Laboratory Management

GLP clarifies responsibilities and introduces structured controls for equipment, personnel, procedures, studies, and records.

6. Reduced Risk of Data Rejection

A well-controlled GLP system reduces the risk that regulators question the reliability, traceability, or integrity of submitted study data.

7. Commercial Advantage

GLP certification can increase the credibility of contract research and testing facilities when working with pharmaceutical, chemical, pesticide, agrochemical, and other regulated industries.

Common GLP Certification Mistakes

Laboratories preparing for GLP certification often focus heavily on documentation while overlooking actual implementation.

Common weaknesses include:

Inadequate QA independence

QA should be able to perform its responsibilities without inappropriate interference.

Poor training records

A laboratory may have competent personnel but inadequate documented evidence of training.

Incomplete equipment records

Calibration alone is not enough. Maintenance, use, repair, inspection, and related records may also need appropriate control.

Weak data-integrity controls

Electronic data systems require appropriate access controls, audit trails, backups, security, and lifecycle management.

Uncontrolled SOPs

Employees should not rely on outdated or unofficial procedures.

Poor deviation management

Deviations should be documented, assessed, and appropriately investigated.

Inadequate archives

Records must remain protected, retrievable, and traceable throughout the required retention period.

Treating GLP as a documentation exercise

This is perhaps the most important mistake.

GLP is not simply a collection of SOPs. It is a quality system that must be implemented in actual laboratory operations.

How to Prepare for a GLP Inspection

A practical inspection-preparation programme can include the following activities:

1. Review the applicable GLP principles.
2. Define the certification scope.
3. Perform a detailed gap assessment.
4. Update the organisational structure.
5. Verify personnel qualifications and training.
6. Review the QA programme.
7. Review all critical SOPs.
8. Check equipment calibration and maintenance.
9. Verify test-item controls.
10. Review study plans and amendments.
11. Audit raw data.
12. Review electronic systems and audit trails.
13. Verify archive controls.
14. Conduct mock inspections.
15. Document and close corrective actions.
16. Ensure management understands the GLP system.

The goal should not be merely to “pass an inspection.” The goal should be to demonstrate that the facility can consistently generate reliable and reconstructable study data.

Role of Quality Assurance in GLP Certification

Quality assurance is central to the Good Laboratory Practice (GLP) certification system.

The QA programme provides an independent mechanism for monitoring whether the facility and studies operate according to GLP requirements.

QA activities can include:

• Facility inspections
• Study-based inspections
• Process inspections
• SOP reviews
• Audit of reports
• Verification of corrective actions
• Reporting observations to management

QA should maintain appropriate records demonstrating what was inspected, what was found, and what follow-up occurred.

Role of the Study Director

The study director has a central role in a GLP study.

The study director is responsible for the overall conduct of the study and for ensuring that the study is conducted according to the approved study plan and applicable GLP requirements.

The role involves coordinating study activities, evaluating relevant information, addressing deviations, and ensuring that the final report accurately represents the study.

The OECD has issued specific guidance concerning the role and responsibilities of the study director in GLP studies.

GLP Certification for Contract Research Laboratories

Contract research organisations and other testing facilities can particularly benefit from GLP certification when they perform regulated safety studies for sponsors.

Certification can demonstrate that the organisation has established controls for:

• Study management
• Personnel
• QA
• Equipment
• Facilities
• Test items
• Raw data
• Reporting
• Archives

This can improve confidence among sponsors and regulatory authorities.

However, a GLP certificate does not automatically mean that every study performed by the organisation is compliant. The study itself must be conducted within the applicable GLP framework and must satisfy the relevant requirements.

Does GLP Certification Apply to Individuals?

This point requires special attention.

There are commercial training courses and professional certificates that provide GLP training or certification to individuals. Such certificates can demonstrate that a person has completed training in GLP concepts.

However, an individual’s GLP training certificate is not the same thing as regulatory GLP certification of a test facility.

For example:

Individual GLP training certificate

Shows that a person has completed a GLP education or training programme.

GLP facility certification

Shows that a test facility has been assessed under an applicable GLP compliance monitoring programme.

These should not be confused in professional or regulatory communications.

GLP Certification in India: Key Points

For laboratories in India, the following points are particularly important:

• NGCMA operates under the Department of Science and Technology.
• NGCMA monitors GLP compliance of test facilities.
• Certification is based on the applicable OECD GLP principles and OECD Test Guidelines.
• GLP certification is voluntary under the national programme.
• Facilities conducting relevant safety studies can apply.
• Inspections form an important part of the certification process.
• Certification requires continuing compliance.
• India has been a full adherent to the OECD Mutual Acceptance of Data system since 2011.

The Government of India’s current information also provides access to NGCMA application and related GLP documents.

Key Takeaways

• GLP means Good Laboratory Practice.
• GLP is a quality system for regulated non-clinical studies.
• GLP certification generally applies to test facilities, not every laboratory.
• GLP certification and individual GLP training certificates are different.
• GLP and ISO/IEC 17025 are different frameworks.
• Quality assurance is a fundamental part of GLP.
• Data integrity is essential to GLP compliance.
• GLP compliance involves the entire study lifecycle.
• In India, NGCMA under DST administers the national GLP compliance monitoring programme.
• Maintaining GLP compliance is an ongoing responsibility.

Conclusion

Good Laboratory Practice (GLP) certification provides a structured framework for ensuring the quality, integrity, reliability, and traceability of data generated during regulated non-clinical studies. It covers the complete study lifecycle, from planning and personnel management to equipment, procedures, quality assurance, data recording, reporting, and archiving.

Good Laboratory Practice (GLP) certification is not simply a certificate or a documentation exercise. It demonstrates that a test facility has established and implemented an effective quality system and can conduct studies in accordance with applicable GLP requirements. For laboratories working in pharmaceuticals, chemicals, pesticides, environmental testing, and other regulated fields, GLP certification can strengthen regulatory confidence and support the acceptance of study data.

Laboratories seeking GLP lab certification should therefore focus on building a strong compliance culture, maintaining data integrity, training personnel, controlling procedures and equipment, and continuously monitoring their quality system. With effective implementation and ongoing compliance, GLP provides a reliable foundation for generating trustworthy non-clinical safety data.

Frequently Asked Questions

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