Analytical method transfer: key considerations

In pharmaceutical development, analytical method transfer serves as the critical bridge between sending and receiving laboratories, ensuring proper transition of analytical proficiency and maintaining method performance as intended. Far from being a mere paperwork exercise, a well-executed transfer demonstrates that a method performs consistently across different laboratories. Within GMP framework and the ICH Q2(R2)/Q14 lifecycle, this step is essential for ensuring reliable results and supporting regulatory confidence. Ultimately, a successful transfer safeguards reliable laboratory performance, maintaining product quality and mitigating risk during site transfers or scale-up¹. For a detailed discussion of validation expectations under ICH Q2(R2) and Q14, see our previous blog on analytical method validation.

Transfer is required whenever the method is executed at a different testing site, such as from one another manufacturing facility to another, or to a quality control contract lab (or vice versa). It is also triggered during regulatory submissions when a method developed in-house in R&D needs to be implemented in a GMP testing environment².

Typical transfer scenario

Analytical method transfer can happen in various contexts. A common scenario is a CRO ↔ client transfer, where a biotech or pharmaceutical company provides a validated method to a contract laboratory for routine GMP testing. Another situation where analytical method transfer is critical involves moving a method from one manufacturing site to another. For instance, a facility in Europe may need to replicate analytical testing that was originally carried out in the United States.

Simply handing over the analytical procedure is not sufficient. The receiving lab must demonstrate that it can perform the method as intended, verify that its results are comparable to those of the sending lab and evaluate any differences in equipment or environmental conditions. When both labs follow clear instructions and carefully assess the data, they are much more likely to get consistent outcomes³.

Regulatory expectations and documentation

Regulatory authorities require that analytical method transfer activities are carefully documented and supported by scientific rationale. During inspections or when reviewing submissions, agencies look at the transfer protocol, the defined acceptance criteria, and the accompanying reports to ensure that the method can be reliably performed at the receiving lab⁴.

Transfer protocols and acceptance criteria

A detailed transfer protocol describes each step of the method, specifies which sample sets will be tested, indicates the number of replicates, and explains how the data will be assessed. While acceptance criteria can vary based on the selected transfer approach, they typically cover relevant parameters and measures, such as relative standard deviation, recovery, or limits of detection, to show that the method works reliably. Clear, predefined criteria make the process transparent and give regulators confidence that the analytical method transfer is scientifically justified¹.

GMP and data integrity considerations

All GMP analytical testing must comply with data integrity principles. That means raw data, calculations, and observations should be traceable, complete, and accurate, among other ALCOA++ principles. During method transfer, labs need to ensure that data collection and reporting procedures match the sending laboratory’s standards. This is not only essential for compliance but also for maintaining trust in comparability testing results across sites⁵.

Analytical transfer approaches

Co-validation: The lab that performs the validation of an analytical test procedure is already qualified to perform the method. The sending lab can involve the receiving lab in an interlaboratory co-validation, as a part of the validation team and thereby obtaining data for the assessment of reproducibility. It helps demonstrate that both labs can produce consistent results under real-world conditions.

Partial revalidation: Repeat of parts of the validation activity at the receiving lab. This is often chosen when:

• The method validation has been completed by the sending lab.
• No / not enough representative batches are available to perform comparative testing, or simultaneous testing at both labs is not possible.
• It may also be the preferred choice of the sponsor.

Comparative testing: Analysis of one or multiple product batches in replicate at the different sites. Both labs test the same samples and results are compared statistically.

Transfer waiver: A formal transfer study may be waived in low-risk situations if scientific justification shows the method is robust, equipment is identical, and personnel are trained. Regulators still expect documented rationale⁶.

Best practices for successful method transfer

A successful analytical method transfer begins with thoughtful planning. Starting with a detailed gap analysis which makes it possible to spot relevant differences between the sending and receiving labs. Identifying these gaps early in the transfer strategy gives the team a chance to assess potential risks, determine the requirements for the transfer, and create a protocol that addresses all the key steps of the method. Taking this approach from the start helps make the transfer smoother and reduces the likelihood of issues occurring later.

Equally important is making sure the method is genuinely fit-for-purpose. Whether it will be used for release testing, stability studies, or routine process monitoring, the method must reliably produce results that are meaningful under the conditions of the receiving laboratory. Assessing the method in the context of its intended use not only prevents surprises during the transfer but also strengthens the overall CMC analytical strategy, making sure that method performance aligns with product quality expectations.

Thorough documentation plays a key role throughout the transfer. All activities from the protocol and supporting documents to test reports and review notes should be clearly recorded. Records should be complete, signed, and stored in a way that supports regulatory readiness. Obtaining approval for the protocol and acceptance criteria before beginning the transfer is indispensable to create transparency, avoids misunderstandings, and shows that the process has been carefully planned. Maintaining detailed records is an important part of analytical method lifecycle management, ensuring that the method remains controlled and reliable from development through routine testing⁸.

Frequently asked questions on method transfer

Importance of gap analysis in method transfer activities?

Performing a gap analysis prior to the analytical method transfer is key to successful transfer activities. By mapping differences between sending and receiving labs, such as equipment, analytical procedure details, materials and environment, early on the teams can anticipate anything that could impact method performance before transfer activities start.  Consequently, the transfer approach can be adjusted upfront so the chances for successful method transfer to the receiving lab are maximized.

When is revalidation required?

Full or partial revalidation is necessary when method validation has already been finalized by the sending lab and method parameters differ  significantly between labs, or when regulators request additional verification (and transfer waiver is no option). Revalidation might also be required when comparative testing is not possible due to the lack of representative batches that can be measured simultaneously (in a similar time window) at both sites. Minor or low-risk differences may only require limited bridging studies instead of full or partial revalidation.

What do regulators expect?

Regulators pay close attention to whether a method transfer is based on sound scientific reasoning. They expect a clear and complete protocol describing the transfer set-up, well-defined acceptance criteria, and proof that the receiving laboratory can reliably reproduce the method. A GMP analytical method transfer should follow ICH Q2(R2)/Q14 guidance and show that the method is robust, reliable, and ready for regulatory submission.

What can go wrong during transfer?

Even with a validated method, problems can happen if the transfer is no’t planned carefully. Differences in equipment, poor method robustness or incomplete documentation can all lead to inconsistent results. Skipping a gap analysis or ill-considered choice of acceptance criteria can cause failed transfers, delays, and extra questions from regulators. Planning ahead and addressing these potential issues makes the process smoother and more reliable.

References

1. Bradley, C. (2025, July 16). Analytical method transfer: Best practices and guidelines. Lab Manager. Assessed from https://www.labmanager.com/analytical-method-transfer-best-practices-and-guidelines-34130
2. Choudhary, A. (2025). Analytical method transfer (AMT) in pharmaceuticals. Pharmaguideline. Assessed from https://www.pharmaguideline.com/2025/09/analytical-method-transfer-in-pharmaceuticals.html
3. Particle Analytical. (2026). Analytical method transfer in pharma. Assessed from https://particle.dk/analytical-method-transfer-in-pharma/
4. WHO. (2011). WHO guidelines on transfer of technology in pharmaceutical manufacturing (Annex 7, WHO Technical Report Series No. 961). Assessed from https://www.who.int/docs/default-source/medicines/norms-and-standards/guidelines/production/trs961-annex7-transfer-technology-pharmaceutical-manufacturing.pdf
5. AnaBioTec. (n.d.). Analytical solutions for your development & filing from pre-clinical to market. Assessed from https://www.anabiotec.com/en/service-groups/release
6. Rushing, W. (2017, November 7). Analytical method transfer best practices: Avoiding the perils of analytical method transfer. Contract Pharma. Assessed from https://www.contractpharma.com/analytical-method-transfer-best-practices/
7. Bradley, C. (2025, August 27). Analytical method transfer between laboratories: Challenges and solutions. Lab Manager. Assessed from https://www.labmanager.com/method-transfer-between-laboratories-challenges-and-solutions-34250
8. Wieling, J. (2015). Robust, fit-for-purpose method transfer: why we should apply equivalence testing. Bioanalysis, 7(7), 807–814.