Container and Closure System Integrity Testing as an Alternative to Sterility Testing for Stability Protocols

What You Need to Know? 👇

What is container and closure system integrity testing and how does it differ from sterility testing?

Container and closure system integrity testing evaluates the physical barrier properties of packaging components to prevent microbial contamination. Unlike sterility testing, which only detects viable organisms present at testing time, integrity testing can detect potential breaches before contamination occurs and is non-destructive.

Can container integrity testing completely replace sterility testing for medical devices?

No, container integrity testing cannot replace sterility testing for product release. It can only substitute sterility testing in stability protocols to monitor continued sterility throughout shelf life. Initial product sterility must still be demonstrated through traditional sterility testing methods before release.

What are the main advantages of using integrity testing over sterility testing in stability protocols?

Key advantages include: detecting container breaches before contamination occurs, conserving samples for other tests, requiring less time than 7-day sterility incubation, reducing false positive results, and providing more reliable assessment of long-term sterility maintenance throughout product shelf life.

Which validation requirements apply when implementing container integrity testing methods?

The test method must be scientifically validated to detect breaches in container and closure system integrity. Validation should be specific to the product container and closure system type. Media-filled containers are acceptable for validation studies, and bracketing matrices can be used for similar products.

What regulatory submissions are required to implement integrity testing for approved products?

For approved products, submit appropriate supplements: “Special Supplement - Changes Being Effected” for human drugs (§314.70), “Supplement - Changes Being Effected” for animal drugs (§514.8) and biologics (§601.12), or PMA supplement for medical devices (§814.39), including validation data.

How frequently should container and closure system integrity testing be performed in stability studies?

Testing should be conducted annually and at expiration, or as required by applicable regulations. The guidance recommends replacing sterility testing at stability time points other than product release, maintaining the same testing frequency as previously established sterility testing schedules.

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What You Need to Do 👇

Recommended Actions

1. Review current stability protocols and consider replacing sterility testing with validated container closure integrity testing
2. Select and validate appropriate alternative test method(s) specific to product container/closure system
3. Prepare documentation demonstrating validation of chosen alternative method(s)
4. Submit appropriate regulatory supplement for approved products:
   • Human drugs: Special Supplement - Changes Being Effected
   • Animal drugs: Supplement - Changes Being Effected
   • Biologics: Supplement - Changes Being Effected
   • Medical devices: PMA supplement
5. Include in submissions:
   • Discussion of test method and applicability
   • Validation data
   • Justification for media-filled container use if applicable
   • Statistical rationale for sample sizes
6. Implement annual and expiration date testing once approved

Key Considerations

Non-clinical testing

• Container and closure system integrity testing should be conducted annually and at expiration
• Alternative test methods must be properly validated
• Number of samples should be statistically appropriate
• Samples passing integrity testing may be used for further stability testing if method is non-destructive

Safety

• Container and closure system integrity tests must demonstrate continued capability to maintain sterility throughout shelf life
• Preservative effectiveness tests alone are not acceptable alternatives for monitoring container integrity

Other considerations

• Alternative test methods may include:
  • Physical/chemical tests (bubble tests, pressure/vacuum decay, trace gas permeation/leak tests, etc.)
  • Microbiological container integrity tests
• Validation can use media-filled containers instead of product-filled containers if justified
• Bracketing matrix approach acceptable for validating multiple products using same container system

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Relevant Guidances 🔗

• Quality System Information Requirements for Premarket Submissions
• Manufacturing Site Inspections and PMA Review Process for Medical Devices
• Submission Requirements for Terminally Sterilized Medical Devices

Related references and norms 📂

• USP: Methods for sterility testing and container closure integrity testing

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Original guidance

• Container and Closure System Integrity Testing as an Alternative to Sterility Testing for Stability Protocols
• HTML / PDF
• Issue date: 2008-02-25
• Last changed date: 2020-05-06
• Status: FINAL
• Official FDA topics: Medical Devices, Postmarket, Drugs, Animal & Veterinary, Biologics, Administrative / Procedural
• ReguVirta ID: 07f6ae6eeb7211a650f3efe75bf9ac25