systems are performing optimally and that results are reliable and reproducible.

2. Scope

This SOP applies to all chromatographic and spectroscopic methods developed within the AMD department where system suitability tests are required before and/or during sample analysis, including but not limited to HPLC, GC, UPLC, and UV-Visible spectroscopy.

3. Responsibilities

• Analytical Scientist: Identifies and sets preliminary system suitability parameters during method development.
• Method Validation Analyst: Evaluates parameters during method validation to finalize suitability criteria.
• QA Reviewer: Reviews and approves finalized system suitability specifications and their application in method SOPs.
• Documentation Officer: Ensures proper recording of suitability data in method protocols and reports.

4. Accountability

The Head of AMD is accountable for reviewing and authorizing system suitability standards and ensuring their compliance with regulatory requirements and scientific rigor.

5. Procedure

5.1 Understanding System Suitability

1. System suitability is a series of tests to verify that the system performance is adequate for the intended analysis.
2. It serves as a prerequisite before beginning the sample analysis or batch release.

5.2 Common System Suitability Parameters

• Retention Time (RT): Time taken for the analyte peak to elute.
• Resolution (Rs): Measure of separation between adjacent peaks. Minimum acceptable value: Rs ≥ 2.0.
• Theoretical Plates (N): Column efficiency. Higher value indicates better separation.
• Tailing Factor (Tf): Peak symmetry. Ideal range: 0.8–1.5.
• Relative Standard Deviation (%RSD): For replicate injections. Acceptable limit: ≤ 2.0%.
• Capacity Factor (k’): Relates to retention and column efficiency.

5.3 Establishing System Suitability Criteria

1. During method development, record multiple injections of the analyte standard.
2. Evaluate RT, Rs, Tf, N, and %RSD from the injections.
3. Identify average and standard deviation values across runs and analysts.
4. Determine appropriate limits by considering:
   • Regulatory expectations (e.g., ICH Q2(R1))
   • Analytical variability
   • Method criticality and complexity

5.4 Integration with Validation Activities

1. Confirm the reliability of system suitability criteria during intermediate precision and robustness validation runs.
2. Record all parameter readings in a dedicated system suitability log (Annexure-1).

5.5 Application in Routine Analysis

1. System suitability criteria must be mentioned in the final test method SOP.
2. Prior to sample analysis, verify that all parameters are within acceptance limits.
3. If any parameter fails:
   • Investigate the cause (e.g., column aging, mobile phase instability).
   • Recalibrate or recondition the system.
   • Do not proceed with sample injections until criteria are met.

5.6 Documentation

1. Use Annexure-1 to log system suitability evaluations for each method developed.
2. Include chromatograms, calculation spreadsheets, and electronic audit trails in method development reports.

6. Abbreviations

• RT: Retention Time
• Rs: Resolution
• N: Theoretical Plates
• Tf: Tailing Factor
• RSD: Relative Standard Deviation
• ICH: International Council for Harmonisation

7. Documents

1. Annexure-1: System Suitability Evaluation Log Template
2. Method Development Worksheet
3. Validation Report Template

8. References

• ICH Q2(R1) – Validation of Analytical Procedures
• USP General Chapter <621> Chromatography
• FDA Guidance for Industry – Analytical Procedures and Methods Validation

9. SOP Version

Version: 2.0

10. Approval Section

	Prepared By	Checked By	Approved By
Signature
Date
Name	Alok Sharma	Nidhi Patel	Dr. Harshita Goyal
Designation	Senior Analyst	QA Reviewer	Head – AMD
Department	Analytical Method Development	Quality Assurance	Analytical Method Development

11. Annexures

Annexure-1: System Suitability Evaluation Log Template

Parameter	Limit	Observed Value	Pass/Fail
Resolution (Rs)	≥ 2.0	2.4	Pass
Tailing Factor (Tf)	0.8–1.5	1.2	Pass
RSD (%)	≤ 2.0	1.1	Pass

Revision History

Revision Date	Revision No.	Details	Reason	Approved By
01/06/2025	2.0	Updated acceptance limits and added annexure log	Annual Review	Dr. Harshita Goyal
01/07/2022	1.0	Initial Issue	New SOP	QA Head