PTC has an immediate opening for a Program Assistant. See job posting.

Make Changes to PT

Request Changes to Testing or PT Registration

To make deletions, additions or method changes, please log into the Web Data Entry System.

Changes to proficiency testing

  • Log into Web Data Entry using your laboratory number and password.
  • Cross off any unwanted analyte or change method*
  • Confirm number of samples to be shipped
  • Send by email to Ken Middlebrook, Executive Director, PTC Inc.

*Please note that method changes can only be made where the method is being clarified but the process remains the same. If the method is changing completely (i.e., GC/MS to IC) then the analyte must be removed and a new one added.

Additions to proficiency testing

Request more information

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