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

Shipment Schedule

2021 PT Sample Shipment Schedule (tentative dates)

Test groups, parameters, matrices, units and concentrations can found in PTC’s Catalog, document PAR02.

NOTE: There have been some changes to the October 2021 PT round. Please see the Schedule Update for details

NOTE 2: The reporting deadline for C70 Potency in cannabis and C78 Water Activity/Moisture in Hemp has been changed to December 10, 2021.

2022 PT Schedule

Original PT RoundOCT 2021JAN 2022MAR 2022JUN 2022OCT 2022
Invoice / Ship Notice12 Nov17 Jan25 Apr22 Aug
Registration Deadline10 Jan28 Feb6 Jun3 Oct
ShippingSee Schedule Update24 Jan21 Mar
14 Mar Microbiology
20 Jun17 Oct
Reporting DeadlineSee Schedule Update25 Feb22 Apr22 Jul18 Nov

2022 Asbestos Schedule (C20 Asbestos)

 JAN 2022MAR 2022JUN 2022OCT 2022 
Invoice / Ship Notice12 Nov 202117 Jan25 Apr22 Aug
Registration Deadline20 Dec 202128 Feb6 Jun3 Oct
Shipping10 Jan 20227 Mar13 Jun10 Oct
Reporting Deadline4 Feb 202222 Apr8 Jul4 Nov

* Refer to PT Catalogue for the original schedule of Individual Test Groups.

** These dates are based on the early lifting of COVID-19 restrictions in Ontario.

Request more information

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