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 85-10
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

- Literature 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 can also be downloaded at once from a single zip file which collates the 128 OECD Harmonised Templates and their related materials. 

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

What's New

Updated Series of OHTs on Pesticide Residue Chemistry (September 2017)

The Series of templates on Pesticide Residue Chemistry was updated and extended. It is now available online as OHTs 85-1 to 85-10. The Series was re-organised (residues in crops and in rotational crops grouped in single files) and completed to cover the whole set of OECD Test Guidelines dealing with pesticide residues: three new templates added on the nature, magnitude and stability of residues in commodities. The two OHTs relating to metabolism in livestock and in crops/rotational crops were harmonised with corresponding MetaPath Study Summary Composers. The updates included also the addition of a range of repeatable fields to capture (new) data reporting tables, and elements to cover the EU Biocidal Product Regulations. Some predefined tables and executive summaries were revised or added as appropriate.

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.