Milk Proficiency Testing Program

​​​​​​​Milk Proficiency Testing samples are annual samples required by the FDA to evaluate analyst competency. Each year, analysts in accredited Grade A dairy laboratories and analysts using a visual read test for drug residue screening are required to analyze Milk Proficiency Test samples. Requirements for analysis are described in Section 6 and Appendix N of the Grade A Pasteurized Milk Ordinance (PMO).

Milk Proficiency Test samples are prepared each March by Wisconsin's Department of Agriculture, Trade and Consumer Protection (WDATCP) Bureau of Laboratory Services (BLS).

For more information on the Wisconsin Milk Proficiency Testing scheme (sample status, data entry, report, etc.), please contact

For more information on participation requirements, certification status, laboratory accreditation, etc., please contact


  • Deadline to register for the 2024 Wisconsin Milk Proficiency Testing scheme will be Wednesday, Jan. 31, 20​24.
  • Proficiency test samples will be shipped Monday, March 18, 2024, with delivery expected on Tuesday, March 19, 2024.
  • Deadline to submit proficiency test results will be Friday, April 5, 2024.
  • Preliminary reports will be distributed early May 2024.
  • Final reports will be distributed late May 2024.

Documents and Forms

Documents and forms are available for viewing, printing, and downloading (saving) in Adobe Acrobat's portable document file (PDF) format. You will need either Adobe Acrobat or Adobe Acrobat Reader​ on your computer and configured to work on your browser to access the file.


Where do I return my shipper?

Please return shippers to:

     WDATCP Bureau of Laboratory Services
     2601 Agriculture Drive, Suite 150
     Madison, WI 53718

The following items must be returned with the shipper: icepacks, polycell floater vial rack, and pegboard. Please note that if shippers are not returned by April 17, 2023, a $50 replacement fee will be added to the billing invoice.

Why won't the "email results​" button ​work?

Some browsers do not support the wide range of PDF features that Adobe Acrobat supports. To enable this button, turn off the browser's built-in PDF viewer (this is not possible with Chrome), or download the form and open it in Adobe Acrobat or Adobe Acrobat Reader. If the submit button still does not work after opening it in Ad​obe Acrobat or Reader, email your completed forms to More instructions can be found here.

How do I report an "estimated" result?

For coliform tests, report your result followed by the letter 'E' (e.g. <1E, 10E). For all other tests, report your result as usual but select 'Estimated' from the dropdown list next to each entry field in the final column ('Equal to' is selected by default).