Note that some PT samples for the current PT round will require specific preparation prior to analysis. For details, please refer to the instruction sheets.

General PT Reports

Below you will find reports from the previous 5 years for each test group. Reports prior to October 2015 are available on request by sending an email to Ken Middlebrook at

The following reports are included in each .zip package:

GENERAL: to be used in conjunction with the custom PDF report emailed to each participant. It identifies the scoring system used and the overall performance summary for all participants.

SUMMARY BY ANALYTE: provides an overall summary of performance, by individual analyte, for all participants. These include:

  • Kernel density plots;
  • z-score plots;
  • Summary statistics by method; and
  • Z-score plots by method







Request more information

If you are interested in acquiring PT for your organization, send an email to