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
Environmental fate and behaviour  - OHTs 24 to 40 & 401
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. 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 129 OECD Harmonised Templates and their related materials. 

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


Updates to all Templates, and new OHT 401 now available online (Dec. 2018)

The full set of OECD Harmonised Templates for Reporting Chemical Test Summaries (OHTs) was updated by ECHA and OECD for a range of improvements and format changes, and aligning them with new characteristics of IUCLID 6.3 launched in October 2018. In particular, a new field ‘Confidential details on test material’ was added to the ‘Test material information’ section of each template. In OHT 53 Toxicity to soil microorganisms and OHT 90 Emissions from preservative-treated wood, percentage field were changed from text to %. In OHT 78 Specific investigations: other studies, the redundancy of ‘specific investigations’ was removed from endpoint phrases, and new endpoints specific to microorganisms were added. The Series of OHTs 303 to 306 on Use and Exposure Information was updated for aligning the ‘Article categories’, ‘product codes’ and ‘Technical function’ phrase groups with internationally-harmonised categories. Then a new OHT 401 on Dispersion stability of nanomaterials was added to the Series on Environmental fate and behaviour (Degradation and accumulation).

Five updated Templates 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.