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
Rinse Sampling
Sampling accessible and enclosed equipment through a justified rinse procedure.
3 connected references
Understand the rinse result
Rinse testing must meaningfully represent residues on equipment surfaces.
CV-REQ-000011
Validation of Cleaning Processes§ Rinse samples
Select suitable sampling methods
Sampling should address soluble and insoluble residues appropriately.
CV-REQ-000016
Q7A: Good Manufacturing Practice for APIs§ 12.7 — sampling
Practical guidance
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.
Can Cleaning Be Monitored in Real Time? In-Line UV Moves Validation Closer to PAT
A STERIS-authored article in Pharmaceutical Technology reports that in-line UV spectrometry at 220 nm can follow a biopharmaceutical cleaning cycle continuously, from heavily soiled rinse to baseline. The data are encouraging, the framing is vendor-supplied, and the distance between process monitoring and a release decision is where our own thinking has to do the work.
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.
Lab, At-Line, Online, In-Line: Where Does TOC Fit?
TOC can live on the QC bench, on the shop floor next to the vessel, or plumbed into the CIP skid. The instrument is the same; the sampling chain — and therefore the meaning of the number — is not.
When Shared Equipment Has Never Been Cleaning-Validated: Lessons From an FDA Warning Letter
An FDA Warning Letter to Indian API manufacturer Micro Orgo Chem describes non-dedicated equipment that had never been cleaned under a validated procedure, cleaning SOPs that were not followed, and no evidence that the rinse and swab samples required by the firm's own procedure were ever collected or tested.
ASTM Moves Toward Dedicated Guidance for TOC in Cleaning Validation
ASTM Work Item WK92599 would give total organic carbon analysis its own dedicated guidance for swab and rinse samples — and force cleaning programmes to defend recovery and limits, not just concentrations.