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The QCS PT program provides online reporting of unknown results and conformance reporting for quantitative and qualitative proficiency trials. The Samples Unknown quantitative PT program is now included in the Proficiency Testing Program. Access to the program and a detailed user guide may be reached using the links below.

QCS Proficiency Testing Program Access

QCS Proficiency Testing Program User Guide
Version 1.4 - Effective January 2, 2023

QCS Proficiency Testing Program 2024 Schedule - Component PT
Udpated February 28, 2024

Proficiency Testing Program 2025 Schedule - Component & Fatty Acids
Udpated September 5, 2024

The QCS Samples Unknown program is monthly quantitative proficiency test to verify the accuracy of laboratory instruments. The timetable of the monthly samples unknown program is such that:

  • In accordance with the published PT schedule, the samples unknown supplier sends duplicate sets of 12 samples to each of the participating DHI component laboratories on the Monday of the week of the PT trial.
  • By midnight EST on the Friday of the same week, each laboratory is required to analyze the 24 samples and submit the results to the QCS Proficiency Program website. Laboratories submitting data after the deadline may be subject to fees or changes in certification status.
  • On the Monday after the submission, QCS analyzes the reference and routine instrument results submitted.
  • When the analysis is complete, participating laboratories are notified that certification and nonconformance reports are available for viewing or printing on the QCS Proficiency Program website.