327 FDA warning letters in five months — a 73% increase over the prior year. The chromatography data system your QC laboratory runs on was not designed to validate its own calibration mathematics. WLTR is the calibration intelligence layer that does.
WLTR sits above your existing chromatography data system as an independent calibration intelligence layer. WLTR connects to your installed Empower, Chromeleon, OpenLab, LabSolutions, or Chromera installation and re-evaluates calibration mathematics against the data you have already captured.
Warning Letters · Jul–Dec 2025
Reed Smith · December 2025
Rise in CDER Warning Letters
RAPS · December 2025
SHARE OF DRUG GMP WARNING LETTERS
Certivo · March 2026
Action : The firm’s quality system did not adequately ensure the accuracy and integrity of data supporting drug safety, effectiveness, and quality; out-of-specification investigations were neither scientifically sound nor conclusive.
Action : HPLC data integrity failures included absence of audit-trail enforcement, shared administrator credentials enabling uncontrolled deletion or modification of HPLC files, and inadequate backup procedures.
Action : A contract testing laboratory cited because laboratory control records lacked complete data, proper documentation, and secondary review; specific test records reviewed during the inspection contained only numerical data with no headers or explanation.
WLTR sits above the CDS as an independent verification layer. WLTR does not generate reportable results, modify methods, or replace the CDS. WLTR re-evaluates the mathematics, documents what the CDS does not record, and produces audit-ready output in regulator-aligned language.
WLTR validates calibration mathematics against the laboratory’s own data — coefficient of determination, response factor, percent error, residual standard error, weighted regression, calibration linearity over the reporting range. Validation runs against the data already captured by Empower, Chromeleon, or OpenLab. No method modification. No revalidation.
WLTR verifies that the chosen calibration model meets compendial and method-specified acceptance criteria for every target analyte, evaluating system suitability under USP <621>, the precision and accuracy expectations of ICH Q2(R2), and the firm’s internal SOPs. Verification supports the analyst at the bench and the QA reviewer in second-line review.
WLTR documents the calibration evaluation in regulator-aligned language — 21 CFR Part 11, ALCOA+, PIC/S PI 041-1, USP <1058>. Output is audit-ready from the moment it is generated. Inspectors see the language they expect.
Operates HPLC, UHPLC, GC, GC-MS, and LC-MS/MS under approved compendial methods. Constructs the initial calibration curve, executes system suitability under USP <621>, and signs the calibration record under 21 CFR 211.194. The calibration decision may be reconstructed by an FDA inspector years after the original injection. WLTR supports the analyst in calibration construction, model selection, and the absence-of-fraud documentation that protects the signature.
Carries statutory accountability for batch certification and product release. The Qualified Person designation under EU GMP Annex 16 creates personal regulatory accountability for batch release. Decisions on analytical infrastructure, instrument fleet management, and CDS strategy sit at this level. WLTR is the institutional verification layer that supports the signature.
Bears existential exposure to a warning letter — equity-price impact, supply chain disruption, recalls, shareholder litigation, and import alerts that can close the U.S. market. Recent enforcement against API manufacturers has shown that a single facility’s data integrity failure can shut down U.S. market access entirely. WLTR is the fiduciary verification layer that makes calibration data defensible before it becomes evidence.
WLTR operates inside the firm’s Pharmaceutical Quality System under 21 CFR 211 and ICH Q10. WLTR is a QA/QC verification layer — categorically distinct from a method modification. No supplemental NDA, ANDA, or alternate test procedure submission is required.
WLTR will run against a sample dataset from your installed CDS — Empower, Chromeleon, OpenLab, LabSolutions, or Chromera — and return audit-ready findings in regulator-aligned language.
