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Important Holiday Shipping Schedule Update


ATCC will be closed Wednesday, December 24, 2025 to Thursday, January 1, 2026. Please be advised  you can still submit orders for products during this time, but shipping will resume on Friday, January 2, 2026.


To ensure shipping before the ATCC holiday closing period, please reference the shipping schedule below:


  • Last shipping day for Domestic orders is Friday, December 19, 2025 (Room temperature items shipping only as no frozen item shipments on Fridays. Frozen/ dry ice shipments resumes January 2, 2026).

  • Last shipping day for International orders is Friday, December 12, 2025.

  • Shipping resumes January 2, 2026 for orders submitted after December 19, 2025.

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Certified Reference Materials

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Biological standards with unprecedented reliability

You need the highest level of quality assurance, accuracy, and traceability in your scientific research. However, the inherent variability of biological materials brings unique challenges to establishing standards for in vitro model systems and setting up the ISO-compliant processes to produce them. 

To support this need, ATCC offers standards produced under ISO 17034 and ISO/IEC 17025 accredited and ISO 9001 certified processes. These certified reference materials are traceable to the original culture and have confirmed identity, well-defined characteristics, and an established chain of custody, making them ideal for use as biological standards for research and development purposes.

Further, each vial is also accompanied by a certificate of analysis that states the results of each assessed property value, the expiration date of the material, and proper use. These certificates confirm that all necessary procedures were performed to ensure their validity and traceability (ISO Guide 30).

ATCC Certified Reference Material have a number of recommended uses, including:

  • Establishing sensitivity, linearity, and specificity during assay validation or implementation
  • Challenging assay performance
  • Validating or comparing test methods
  • Testing and calibration in ISO 17025 labs that stipulate the use of reference materials
  • Benchmarking critical assay performance for regulatory submissions and production lot release

ATCC Certified Reference Materials offer the highest level of quality assurance, accuracy, and traceability, and they give you complete confidence that your results are reliable and reproducible. Explore our certified reference materials below to get started.

Notice: Live microbial certified reference materials (CRMs) will be discontinued at the end of 2026. The same strains previously offered as CRMs are now available in our precisely quantitated MicroQuant™ format, providing a reliable alternative for your needs.

Certified Reference Materials

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