Demonstrate sampling recovery
Recovery should be demonstrated for sampled contact materials and methods.
CV-REQ-000001
EU GMP Annex 15: Qualification and Validation§ 10.12
TOPIC EXPLORER
Recovery
Understanding what the sampling and analytical procedure can retrieve.
5 connected references
Understand swab compatibility
Sampling materials and extraction solvents can influence analytical results.
CV-REQ-000010
Validation of Cleaning Processes§ Direct surface sampling
Understand the rinse result
Rinse testing must meaningfully represent residues on equipment surfaces.
CV-REQ-000011
Validation of Cleaning Processes§ Rinse samples
Establish method capability
Analytical sensitivity and attainable recovery should support residue evaluation.
CV-REQ-000017
Q7A: Good Manufacturing Practice for APIs§ 12.7 — analytical methods
Design direct surface sampling
Surface sampling needs a justified, reproducible collection approach.
CV-REQ-000027
Cleaning validation guide (GUI-0028)§ 9.2.1
Practical guidance
HPLC, LC-MS/MS, TOC, UV or Visual Inspection? Choosing a Cleaning Validation Method by Risk
The analytical method is not a laboratory preference — it is the part of the cleaning validation strategy that decides whether a limit is actually measurable. The useful question is not which technique is 'best' but which technique matches the residue, the acceptance limit, the sampling method and the surface. This analysis walks through the trade-offs using published recovery, detection and clearance data, and shows why a method chosen before the residue is characterised tends to fail at the limit rather than at the bench.
A MACO Is Only as Good as the Assumptions Behind It
A maximum allowable carry-over value is a PDE multiplied by a set of process assumptions — batch size, dose, surface area, recovery and the cleaning step itself. Read as a body of evidence, the 2025–2026 enforcement record is rarely about toxicity assessment, and almost always about those assumptions.
PIC/S Publishes PI 006-4: A New Qualification and Validation Recommendation Takes Effect in October
PIC/S has published PI 006-4, the revised Recommendations on Qualification and Validation, superseding the 2007 PI 006-3 and entering into force on 1 October 2026. Cleaning validation now occupies a full chapter, with HBEL-driven scope, explicit limits on visual inspection and a clear position against continued test-until-clean practice.
What FDA Has Been Citing in Cleaning Validation: The Recurring Themes of 2025–2026
Twelve FDA warning letters issued between 3 December 2024 and 24 July 2026 cite cleaning and cross-contamination control. Read together rather than case by case, they stop looking like twelve incidents and start looking like one audit checklist: worst-case selection, hold times, recovery, MACO justification, visual-only strategies, sampling locations, change control and lifecycle management — in that order of frequency.
ADCs Are Creating a New Cleaning Validation Problem
Antibody-drug conjugates combine a biologic, a chemical linker and a cytotoxic payload on shared equipment. A STERIS webinar frames the problem; independent guidance shows why one product-specific assay no longer answers the question.
Should Cleaning Validation Extend Into the QC Laboratory?
A 2025 DARU Journal of Pharmaceutical Sciences study builds a structured cleaning-validation protocol for QC-lab glassware and stainless-steel equipment, using oxcarbazepine as worst-case API and pairing HPLC residue analysis with conductivity and TOC detergent checks.
When MACO Is Not Enough: What the Granules India Warning Letter Really Teaches
The FDA rejected a retrospective MACO argument in a February 2025 warning letter — not because the arithmetic was wrong, but because the cleaning it assumed had not been performed. What cleaning-validation teams can take from it.
Cleaning Validation Meets Waste Treatment: A Study of SGLT-2 Inhibitor Residues
A NIPER-Ahmedabad group pairs a validated RP-HPLC surface-residue method for three SGLT-2 inhibitors with a detoxification strategy for the resulting cleaning waste.