Never Store Biological Indicators Near Electromagnetic Sources

Do Not Store Biological Indicators Near Electromagnetic Sources

Remember: Keep biological indicators away from electromagnetic fields to protect spore viability and ensure accurate sterility validation.

Why This Matters in GMP

Biological indicators (BIs) are used to verify the effectiveness of sterilization processes such as steam autoclaving, ethylene oxide sterilization, or dry heat cycles. These indicators contain highly resistant bacterial spores — typically Geobacillus stearothermophilus or Bacillus atrophaeus — whose survival or destruction serves as proof of process efficacy. Exposure to electromagnetic fields (EMF), particularly those from high-powered devices or wireless transmitters, can compromise the viability of these spores even before use.

Storing BIs near electromagnetic sources can unintentionally damage the microbial content or degrade the carrier medium, thereby invalidating results. If compromised BIs are used in cycle validation, they may show false-positive or false-negative results, which could lead to incorrect release of non-sterile batches or rejection of perfectly sterile loads. Such errors introduce significant risks to product quality and patient safety and undermine the entire sterility assurance program.

Also Read: Ensure QA Oversight in Destruction of GMP Rejected Products

Regulatory and Compliance Implications

21 CFR Part 211.63 stipulates that equipment — including test indicators — must be located to prevent contamination and ensure reliable performance. EU GMP Annex 1

emphasizes the reliability of validation tools and the protection of sensitive materials. WHO GMP guidelines also highlight proper handling and storage of microbiological materials, including the avoidance of interference that may compromise their utility.

During audits, inspectors may ask where BIs are stored and how their viability is maintained. Evidence of exposure to unregulated environmental factors such as heat, light, or EMF may result in data integrity concerns. Use of potentially compromised BIs for sterilization validation is considered a major GMP failure, often triggering requalification, recalls, and intensified regulatory scrutiny. Protecting BIs from EMF is part of maintaining the overall reliability of sterility testing programs.

Also Read: Never Allow Maintenance Tools in Grade A GMP Cleanrooms

Implementation Best Practices

Designate a BI storage cabinet that is temperature- and humidity-controlled, away from EMF sources such as routers, servers, induction equipment, and electrical panels. Train microbiology and QA staff on the sensitivity of BIs and include EMF exclusion in the storage SOP. Validate BI storage areas and monitor environmental factors that may affect spore viability.

Perform periodic checks of storage areas for compliance. Use shielding materials or Faraday enclosures in high-risk areas if complete separation is not feasible. Ensure all BI shipments are inspected on receipt for damage or deviation from recommended conditions. Include EMF considerations in any facility design or relocation plans involving sterile QA labs or autoclave zones.

Also Read: Never Stack Rejected Goods in GMP Primary Warehouses

Regulatory References

– 21 CFR Part 211.63 – Equipment design, size, and location
– EU GMP Annex 1 – Manufacture of sterile medicinal products
– WHO TRS 961, Annex 6 – Microbiological testing and validation
– ISO 11138 – Sterilization of health care products – Biological indicators