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


Five updated Templates now available online (August 2018)

Five revised OECD Harmonised Templates for Reporting Chemical Test Summaries (OHTs), developed and approved during the first half of 2018 to cover some new or revised OECD Test Guidelines, are now published online: OHT 47 Tox. to microorganisms (from the Series on Effects on Biotic Systems), OHT 61 Acute toxicity: inhalation, OHT 62 Acute toxicity: dermal, OHT 68 Repeated dose toxicity: inhalation and OHT 71 Genetic toxicity in vivo (from the Series on Health Effects). Their updated Word files (August 2018 version) are available on the website, while the corresponding XML Schemas and changes to the ‘ALL PICKLISTS’ document will be published later, together with other OHT updates in line with IUCLID 6.3 to be issued in October. 


Nine Updated Templates available online (January 2018)

Nine revised OECD Harmonised Templates for Reporting Chemical Test Summaries (OHTs), developed and approved during 2017, are now published online (December 2017 version): four templates from the Series on Effects on Biotic Systems were extended to cover some new OECD Test Guidelines (OHT 43 and OHT 44:-Short-term/-Long-term toxicity to aquatic invertebrates; OHT 46 Tox. to aquatic plants other than algae; and OHT 50-2 Tox. to terrestrial arthropods); and five templates from the Series on Health Effects (OHT 67, OHT 68 and OHT 69-1: Repeated dose toxicity: -oral / -inhalation / -dermal); OHT 70: Genetic tox. in vitro; and OHT 73: Tox. to reproduction) were updated to align them with some revised/new OECD Test Guidelines. The lists containing ALL OHTs and related materials, ALL XML SCHEMAS and ALL PICKLISTS were updated accordingly.