The OECD Harmonised Templates (OHTs) are standard data formats for reporting information used for the risk assessment of chemicals, mainly studies done on chemicals to determine their properties or effects on human health and the environment, but also for storing data on use and exposure. They are aimed at developers of database systems, as they prescribe the formats by which information can be entered into and maintained in a database. By using these templates, governments and industry are easily able to electronically exchange test study summary information. The templates can be used to report summary test results for any type of chemical (e.g., pesticides, biocides, industrial chemicals).

The OECD Harmonised Templates cover endpoints and reporting elements which are grouped as follows:

Physico-chemical properties (incl. nanomaterials) - OHTs 1 to 23-5 & 101 to 113
Degradation and accumulation - OHTs 24 to 40
Effects on biotic systems - OHTs 41 to 57
Health effects - OHTs 58 to 84 & 86
Pesticide residue chemistry - OHTs 85-1 to 85-7
Analytical methods - OHT 87
Efficacy - OHTs 88 & 89
Emissions from treated articles - OHT 90
Intermediate effects - OHT 201
Use and exposure information - OHTs 301 to 306
Generic elements for all OHTs

- Litterature reference - Test material information                        - Reference substance - Chemical inventory

Each Template is accessible online in readable format (.doc file), with associated html schema (.xsd file), and with predefined tables and executive summaries (.html files) as available. Since the webpage renovation made in June 2016, the links to corresponding OECD Test Guidelines are given where applicable. 

All OHT materials (April 2016 version) can also be downloaded at once from a single zip file which collates the 126 OECD Harmonised Templates and their related materials. The file was completed with the generic elements in February 2017.

For more information and technical details on Templates see : Introduction; Format and conventions used

What's New

Generic elements added online (February 2017)

The four "core template" files containing the generic elements for all OHTs: Litterature Reference, Test Material Information, Reference Substance, and Chemical Inventory, not published with the 2016 update, were added online for completion in February 2017.

Full set of revised and new Templates is now published online (August 2016)

The OECD Harmonised Templates for Reporting Chemical Test Summaries (OHTs) were revised to include a set of updates, technical improvements and completions identified by OECD and template users over the past years. The changes, approved in 2015, contribute to harmonising the elements considered, the picklists and the terminology used in the OHTs. The template format was simplified, and future updates will be facilitated. In addition, new templates are made available on the following type of information: additional physico-chemical properties (OHTs 23-2, 23-3, 23-4 and 23-5), in vivo endocrine disrupter testing in aquatic vertebrates (OHT 48-2), intermediate effects (OHT 201), use and exposure information (OHTs 301 to 306)

The IUCLID 6 system, released in April 2016, is fully aligned with these revised and new OHTs.