API offers PT programs for labs performing microbiology and chemistry analyses on food products. Participants can select from a variety of programs and matrices to match the testing performed at their facility. The enrollment fee includes three shipments per year, easy-to-understand evaluation reports comparing your performance to other laboratories, and extra report copies sent to any management personnel who require them. Sample evaluation reports with an explanation of what they contain are available from the Learn More link on the left.

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Our catalog in PDF format contains details on the programs we offer and the analytes included in each program. Laboratories typically enroll for one year, which includes three test events with two samples in each. Mid-year enrollments are welcome; we will prorate prices to reflect the test events remaining. For information on how to order or whom to contact with questions, please click on the Distributor Locator link above.


NEW for 2016

Water Microbiology* – Quantitative tests for Total Plate Count, Total Coliform Count, and Total Enterococci Count.

Pseudomonas – Qualitative and quantitative tests for Pseudomonas sp. will be offered only in the third event of 2016.

Technician Competency – In 2016, Food Chemistry Proficiency Testing customers will also be able to submit up to four additional sets of results in using the Technician Competency program on

*Not all analytes are included in API’s scope of accreditation. Our full scope of accreditation to ISO/IEC 17043 is available on our website at by clicking on the A2LA Accredited logo.

Added in 2015

Anaerobic Package (Formerly Clostridium) - This package offers participants the options to enumerate Total Anaerobic Count, Sulfite-reducing bacteria, Clostridium sp., and Clostridium perfringens. As with all other packages, participants can respond to one or more analytes in this package.

Cronobacter – Qualitative test for the presence of Cronobacter sp. – available only with a milk matrix.

Vibrio – Qualitative test for the presence of Vibrio sp. – no matrix.

Pseudomonas – Qualitative and quantitative tests for Pseudomonas sp. – available with either a milk or meat matrix.

Listeria – In 2015 the Listeria module will include the option to enumerate both Listeria sp., Listeria monocytogenes, or both. These options are included in the price of the Listeria module.

Quantitative Package – Also in 2015, participants will have the option to enumerate Osmophilic Yeast and Mold and Thermotolerant Coliforms. These options are included in the price of the Quantitative packages.