FilterIntegrityTestQualityChecker

Filter Integrity Test Quality Checker — Control of Sterilizing Filter Integrity

ℹ️  Utility checks critical parameters of filter integrity tests (USP <1229.1> / EU GMP Annex 1):
   • Bubble Point Test: Pressure must be ≥ specified minimum (ensures pore size).
   • Diffusion Flow Test: Air flow must be ≤ specified maximum (ensures no defects).
   • Water Intrusion Test: Water flow must be ≤ specified maximum (for hydrophobic filters).

⚠️  CRITICAL: Filter integrity test failure means the filter is not sterilizing!
   Product passed through such a filter is considered non-sterile and must be rejected.

Usage:
 FilterIntegrityTestQualityChecker.exe                            → demo mode (console output)
 FilterIntegrityTestQualityChecker.exe input.csv output.json      → evaluate your data

Input format:
BatchNumber,TestType,MeasuredValue,LowerLimit,UpperLimit,TestTemperatureC

Example:
 FILTER-BP-2026-001,BubblePoint,4200,4000,0,23.0

— WHY IS THIS NEEDED?
Filter Integrity Test (FIT) is a mandatory batch release test for sterile products.
• Confirms that the filter has the correct pore size (usually 0.22 or 0.45 µm) and is undamaged.
• Performed before (Pre-use) and after (Post-use) filtration.
• USP <1229.1> and EU GMP Annex 1 require documentation of results and immediate investigation upon failure.
• Automation eliminates manual comparison errors with limits specified by the filter manufacturer.

⚠️  CRITICAL:
• Limits are unique for each filter type, size, and manufacturer.
• Temperature affects gas/liquid viscosity and surface tension, so T control or correction is important.
• Filter wetting (for Bubble Point) must be complete.
• Post-use test may be hindered by product presence in the filter (requires rinsing).

Key features:
• Support for main methods: Bubble Point, Diffusion Flow, Water Intrusion.
• Verification of measured values against specifications.
• Generation of PASS/FAIL status for LIMS integration.

Critical parameters:
• Bubble Point: >= Lower Limit
• Diffusion Flow: <= Upper Limit
• Water Intrusion: <= Upper Limit

💡 Usage tips:
1. Always use current limit data from the filter manufacturer (Certificate of Quality).
2. Ensure the testing system is calibrated (pressure and flow sensors).
3. For Post-use tests, ensure the filter is thoroughly rinsed with Water for Injections (WFI).
4. Document any deviations in test temperature.
5. Immediately quarantine the product batch if the Post-use test fails.

⚠️ Note: Integrity test is an indirect method of sterility control. It does not replace product sterility testing but is a more reliable indicator of filtration efficiency.