analytical methods for drug substances and drug products used at Receiving Units (RU) where deviations, failures, or inconsistencies are observed in comparison to Sending Unit (SU) data.

3. Responsibilities

• RU Analyst: Identifies and reports method-related problems with supporting evidence.
• SU Scientist: Supports troubleshooting by providing guidance, documents, and method history.
• QA Executive: Monitors compliance, investigates root causes, and approves CAPA if required.

4. Accountability

The Head of Analytical Method Development is accountable for ensuring a root-cause-based troubleshooting mechanism is followed for all post-transfer issues and is properly documented and resolved.

5. Procedure

5.1 Issue Identification

1. Log all anomalies observed during transferred method execution (e.g., inconsistent results, system suitability failure, unexpected peaks).
2. Complete a Method Issue Notification Form (Annexure-1) and submit to QA and SU.

5.2 Preliminary Investigation

1. Check system suitability, analyst proficiency, reagent quality, instrument calibration, and environmental conditions.
2. Review chromatograms for retention time shifts, peak shape issues, or ghost peaks.

5.3 Root Cause Analysis

1. Compare RU data with SU historical trends and benchmarks.
2. Use the 5-Why or Fishbone (Ishikawa) diagram technique for structured RCA.
3. If required, perform a side-by-side run by SU and RU under same conditions.

5.4 Troubleshooting Actions

• Reagents: Replace with fresh batches.
• Column/Consumables: Change columns, filters, vials as per original method specs.
• Method Parameters: Adjust pH, wavelength, flow rate slightly within validated ranges.
• Equipment: Recalibrate or change instrument module (detector, injector).

5.5 Documentation and Reporting

1. Document all tests, observations, and changes made during troubleshooting.
2. Summarize in Troubleshooting Report (Annexure-2) with CAPA recommendations.
3. Route to QA for review and approval.

5.6 Re-Verification and Closure

1. Once resolved, repeat full system suitability and method run on affected batch.
2. Compare new results with acceptance criteria and SU reference values.
3. Close the issue through QA approval and archive documentation.

6. Abbreviations

• SU: Sending Unit
• RU: Receiving Unit
• CAPA: Corrective and Preventive Action
• RCA: Root Cause Analysis
• QA: Quality Assurance

7. Documents

1. Method Issue Notification Form – Annexure-1
2. Troubleshooting Investigation Report – Annexure-2
3. RCA and CAPA Log – Annexure-3

8. References

• ICH Q9: Quality Risk Management
• FDA Guidance on Analytical Procedure Transfers
• USP <1224>: Transfer of Analytical Procedures

9. SOP Version

Version: 2.0

10. Approval Section

	Prepared By	Checked By	Approved By
Signature
Date
Name	Ashwini Khare	Jitesh Rana	Sunita Reddy
Designation	QC Analyst	QA Reviewer	Head – AMD
Department	Analytical Method Development	QA	Analytical Method Development

11. Annexures

Annexure-1: Method Issue Notification Form

Issue ID	MIF/300/01
Date Reported	15/05/2025
RU Analyst	Deepak Nair
Method Name	HPLC Assay for ABC Tablet
Description	Late eluting impurity peak observed; not reported at SU

Annexure-2: Troubleshooting Investigation Report

Upon inspection, it was found that the impurity peak originated due to degraded buffer and partially clogged column. Fresh mobile phase prepared and column replaced. Issue resolved.

Annexure-3: RCA and CAPA Log

Root Cause	Corrective Action	Preventive Action	Status
Degraded mobile phase	Prepared fresh buffer	Introduce expiry labeling on buffer bottles	Closed

Revision History:

Revision Date	Revision No.	Details	Reason	Approved By
21/05/2025	2.0	Added root cause analysis tools and clarified preventive actions	Annual SOP Review	Sunita Reddy
01/09/2022	1.0	Initial Release	New SOP	QA Head