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Accreditation Systems and Programs

Minituber (Solanum tuberosum) Laboratory Testing Pilot with Private Laboratories

APHIS will provisionally approve qualified private laboratories to conduct pathogen testing of minitubers (Solanum tuberosum) and plant tissues used for the production of minitubers in support of U.S. export certification beginning August 2016.  This pilot will allow APHIS to evaluate the use of private laboratory pathogen test results for phytosanitary certification prior to pursuing implementation through rulemaking.

To qualify for the pilot, private laboratories must have International Organization for Standardization/International Electrotechnical Commission (ISO/IEC) 17025 accreditation for laboratory testing of plants and plant product pathogens. Interested laboratories must complete and sign the application form and meet all applicable APHIS requirements to participate. To request the application form, please send an email to

During the pilot, industry may use laboratory test results from approved private entities when they apply for minituber phytosanitary certification. Once entities complete the application process, a list of approved laboratories will be provided on this page.

APHIS’ other accreditation programs—the State National Harmonization Program and the National Seed Health System —will continue to operate without any policy or operational changes. 

For more information about this pilot, please send an email to

APHIS-Approved Private Laboratories

Company APHIS Approval Status Third-Party Accreditation Approved Services
Agdia Testing Services
52642 County Rd. 1
Elkhart, IN 46514
September 25, 2020

September 22, 2023
ANAB (ANSI National Accreditation Board)

ISO/IEC 17025:2017
Testing of plant pathogens associated with minituber (Solanum tuberosum) and tissue derived from plants used for the production of minitubers.
Exact Scientific Services, Inc.

1355 Pacific Place,
Ste. 101
Ferndale, WA 98248
February 4, 2021
February 4, 2022
ANAB (ANSI National Accreditation Board)

ISO/IEC 17025:2017 (Valid to: January 29, 2023 )
Testing of plant pathogens associated with minituber (Solanum tuberosum) and tissue derived from plants used for the production of minitubers.

National Seed Health System (NSHS)
The NSHS was established by 7 CFR 353.9 . The NSHS specifies standards for laboratory seed health tests and seed crop field inspections used for issuing phytosanitary certificates that meet international regulations pertaining to seed exports from the United States.

Regulatory Framework for Seed Health (ReFreSH)
To reduce that plant pest risk associated with the international movement of seed, USDA’s Plant Protection and Quarantine (PPQ) program developed the Regulatory Framework for Seed Health (ReFreSH) in collaboration with the seed industry, State and Federal officials, academia, and others. ReFreSH is a PPQ-approved systems approach that identifies and leverages current seed industry production and quality management practices that reduce overall pest risk. It will recognize these measures within the context of an accreditation program that accommodates all seed sectors and all sizes of companies.

State National Harmonization Program (SNHP) 
This SNHP for seed potatoes specifies minimum phytosanitary standards to enhance uniformity and quality in seed potatoes shipped between states; enhance marketing of high quality commercial potatoes grown in the U.S.; and enhance international marketing of quality seed potatoes exported from the U.S. Requirements for participants include minimum standards set by State regulatory authorities for certification of seed potatoes to facilitate interstate shipment, export and cooperation in pest management.

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