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Derwent World Patents Index: Manual Code revision 2020

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Emtree in Classic STN Updated for 2016 with Additional Thesaurus Fields and Expanded Terminology

10. February 2016

The 2016 Emtree is now available in Embase and Embase Alert on classic STN! The Emtree thesaurus provides access to the terminology of pharmacology, biomedicine and medical devices, and should be used for designing comprehensive yet precise searches. The thesaurus now includes several types of new data:

Field Code

Field Name



Subheading Abbreviation

Two character subheading for medical and drug subheadings. Example: PR/CT, for the term pharmaceutics


Term Type

Emtree controlled terms are classified as one of the following: disease term, drug term, device term or medical term


History Note

Includes creation date for Preferred terms, plus additional history notes. May also include scope notes describing how the Preferred Term is indexed.


Term Name Type

Applies to Preferred Terms only. Will be one of the following: MeSH descriptor, device trade name or drug trade name.


Enzyme Commission Number

Numerical classification scheme for enzymes. Example: EC

In addition to the new data, this version of Emtree introduces 640 new terms:

  • 124 drug terms (terms assigned to the Chemicals and Drugs facet)
  • 516 non-drug terms (terms not assigned as Chemicals and Drugs)

Some of the new terms were added to maintain consistency with MeSH, the Medical Subject Headings Thesaurus used in MEDLINE. The total number of preferred terms in Emtree is now 73,127.

Emtree 2016 has been in use since the beginning of the new calendar year. STN customers running Alerts in Embase are encouraged to review the vocabulary changes introduced with this new version of Embase, and adjust their search strategies as necessary. To see lists of new and replaced terms (no terms were deleted in this edition of Emtree) go to
Refer to the updated Database Summary Sheets for Embase and Embase Alert for additional information on Emtree (