Best Practices for Retaining Food Samples and Analytical Records

Once the analytical work is complete, the real challenge begins: deciding what to keep and what to discard. Food testing laboratories generate a continuous stream of physical samples and documentation, and managing these materials requires thoughtful policies that balance regulatory compliance, quality assurance, and practical limitations. Whether you operate an in-house laboratory or work with third-party testing facilities, understanding the principles of sample and record retention is essential for protecting both product integrity and your organization’s interests.

Why retention policies matter in food analysis 🔗

Retention policies serve multiple critical functions in food laboratory operations. First, regulatory bodies often mandate specific holding periods for samples and documentation. Under FDA regulations at 21 CFR 117.315, food safety records must be retained at the plant or facility for at least two years after they were prepared. Records relating to the adequacy of equipment or processes must be kept for at least two years after their use is discontinued.

Beyond compliance, retained samples allow companies to evaluate consumer complaints, verify product quality throughout shelf life, and provide evidence during investigations or recalls. When a customer files a complaint or a safety issue emerges, having access to samples from the relevant production lot can be invaluable for identifying where a problem occurred.

Sample retention fundamentals 🔗

A retain sample program ensures that production samples from each manufactured lot are kept onsite. These samples serve as references for quality evaluation, complaint investigation, and potential regulatory review. Most food industry standards recommend collecting samples at multiple points during production, typically at the beginning, middle, and end of each production run.

Determining retention periods for samples 🔗

The appropriate retention period depends on several factors including product type, shelf life, and potential legal exposure. Many experts recommend retaining samples for the product’s stated shelf life plus an additional ten percent buffer. This accounts for consumers who may use products beyond the printed expiration date.

For shelf-stable products, some facilities retain samples for the product’s shelf life plus one year. Perishable items with short shelf lives, such as deli meats or fresh prepared foods, may only require retention for a few days beyond the best-by date. Contract laboratories typically follow different schedules: food microbiology samples are commonly retained for 30 calendar days, while highly perishable items like water samples may be held for only 7 days.

Storage conditions and sample integrity 🔗

Proper storage is critical for maintaining sample integrity during the retention period. Temperature control is paramount, with many food samples requiring refrigeration at 2-8°C or freezing at -18°C or below. Samples must be stored in containers that prevent contamination and degradation. Each retained sample needs clear labeling showing identification information, testing date, and the scheduled end of the retention period.

The storage area should be designated exclusively for retain samples, properly secured, and accessible only to authorized personnel. Combining retain samples with active ingredients or production materials creates risks for both contamination and improper access.

Record retention requirements 🔗

Documentation requirements often extend well beyond sample retention periods. FDA’s Good Laboratory Practice regulations at 21 CFR 58.195 establish specific retention periods for nonclinical laboratory studies. Records must be retained for at least two years following approval of an application that used the study results, or five years following submission to the FDA, whichever is shorter. When studies do not support regulatory submissions, records should be kept for at least two years after study completion.

Types of records requiring retention 🔗

Laboratory records encompass far more than final test reports. Complete documentation includes raw data sheets, calibration records, quality control results, analytical protocols, and training records. Clinical laboratory guidance indicates that all data records and reports must be safely and securely retained for a defined period sufficient to fully reconstruct the study if necessary.

The shift toward electronic records has added complexity to retention planning. Electronic data must be stored in formats that ensure long-term accessibility and verifiability. Backup systems, access controls, and audit trails all factor into electronic record management.

Categorizing records by importance 🔗

Not all records warrant the same retention treatment. The USDA’s Food Safety and Inspection Service categorizes records as permanent, temporary, non-records, or transitory. Permanent records have historical or evidential value warranting indefinite preservation. Temporary records may be disposed of after specified periods. Transitory records typically need retention for no more than 90 days.

Quality assurance systems should establish clear categories and corresponding retention periods for each type of documentation the laboratory generates. This classification prevents both premature destruction of valuable records and unnecessary accumulation of materials that no longer serve any purpose.

Special considerations for litigation-sensitive cases 🔗

When litigation is reasonably anticipated, standard retention policies give way to legal hold requirements. A legal hold program defines the processes by which information is identified, preserved, and maintained when a duty to preserve has arisen. This duty supersedes normal records management policies that would otherwise result in destruction of relevant materials.

Implementing legal holds 🔗

Effective legal hold implementation requires several key steps. First, potentially relevant samples and records must be promptly identified when litigation becomes reasonably foreseeable. Staff handling affected materials need formal notification about the hold. Normal disposal processes must be suspended for materials under hold, and additional preservation measures may be needed to maintain sample integrity for extended periods.

A litigation hold order should define the scope and timeframe subject to preservation, including both beginning and anticipated end dates. The order should clearly specify whether it extends to documents created on an ongoing basis after the hold is initiated.

Chain of custody documentation 🔗

For samples that may become evidence, maintaining an unbroken chain of custody is essential. This includes detailed tracking of every sample transfer from collection through analysis and storage, use of tamper-evident seals and restricted-access storage areas, witness signatures verifying sample transfers where appropriate, and photographic documentation of sample condition at critical points.

Federal Rules of Civil Procedure provide a safe harbor for documents inadvertently destroyed despite good faith efforts to maintain and follow a record retention program. However, claiming this protection requires having an effective program in place and consistently enforced before any discovery requests arrive.

Proper disposal of samples and hazardous materials 🔗

Once retention periods expire, samples should be systematically disposed of rather than allowed to accumulate indefinitely. The overriding principle in laboratory waste management is that no activity should begin unless a disposal plan has been formulated. This ensures compliance with state and federal requirements and prevents unexpected difficulties.

Hazardous waste identification 🔗

Food laboratories commonly work with materials that qualify as hazardous waste under environmental regulations. EPA regulations establish specific requirements for hazardous waste generated in laboratory settings, including standards for accumulation time frames and container management.

Hazardous chemical waste is defined as any liquid, gaseous, or solid chemical that is ignitable, corrosive, reactive, toxic, or listed by regulation. Common examples in food laboratories include solvents used in analytical procedures, reagent chemicals that are no longer needed, and byproducts from certain testing methods. Disposal through sinks, drains, or regular waste channels is strictly prohibited for these materials.

Disposal procedures and documentation 🔗

Proper identification and labeling of all waste containers is essential. Laboratories should never store hazardous waste in food containers such as water bottles or juice jugs, even if chemically compatible. Containers must be compatible with the waste they hold, securely capped during storage, and left with adequate headspace for expansion.

Documentation of sample disposal is just as important as documentation of sample analysis. The quality and safety group bears responsibility for properly recording disposal activities, including any testing performed on samples before destruction. This documentation protects the organization by demonstrating that samples were handled appropriately throughout their lifecycle.

Building an effective retention program 🔗

Creating a comprehensive retention program requires addressing multiple operational elements. Written policies should clearly specify retention periods for each category of samples and records, storage requirements and locations, responsibility assignments for program management, disposal procedures after retention periods end, and processes for handling legal holds and other exceptions.

All certification standards require food businesses to maintain records that provide evidence that activities actually took place. The program should include initial training for all laboratory personnel on retention procedures, periodic refresher training when policies change, and role-specific instruction for staff directly responsible for managing retained materials.

Regular audits verify that the retention system functions as intended. These should include scheduled compliance reviews, storage condition monitoring for temperature, humidity, and security, and periodic policy updates based on changing regulatory requirements or operational needs.

What do you think? How does your organization balance the need for comprehensive sample retention against practical limitations of storage space and resources? Have you faced situations where retained samples or records proved valuable during investigations or disputes?

References

1. https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-117/subpart-F/section-117.315
2. https://www.food-safety.com/articles/10445-fundamentals-of-a-retain-sample-program
3. https://haccpmentor.com/keeping-retention-samples/
4. https://emsl.com/Page.aspx?id=525&bcl=2
5. https://www.ecfr.gov/current/title-21/chapter-I/subchapter-A/part-58/subpart-J/section-58.195
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC2213906/
7. https://www.fsis.usda.gov/policy/fsis-directives/2620.1
8. https://www.daymarksi.com/information-technology-navigator-blog/legal-hold-101-data-retention-and-destruction
9. https://www.rmmagazine.com/articles/article/2024/04/25/the-importance-of-document-retention-and-litigation-hold-orders
10. https://www.clm.com/record-retention-policies-2/
11. https://www.ncbi.nlm.nih.gov/books/NBK55885/
12. https://www.epa.gov/hwgenerators/regulations-hazardous-waste-generated-academic-laboratories
13. https://ehs.sfsu.edu/laboratory-hazardous-waste
14. https://safety.uchicago.edu/environmental-health/hazardous-waste-and-handling/hazardous-waste-and-disposal-procedures/
15. https://haccpmentor.com/manage-haccp-records/