| Code | Display | Definition |
| primary-human-use | Primary human use | Human-friendly main or official abstract |
| primary-machine-use | Primary machine use | Machine-friendly main or official abstract |
| truncated | Truncated | Truncated abstract |
| short-abstract | Short abstract | Brief abstract, for use when abstracts are provided in different sizes or lengths |
| long-abstract | Long abstract | Long version of the abstract, for use when abstracts are provided in different sizes or lengths |
| plain-language | Plain language | Additional form of abstract written for the general public |
| different-publisher | Different publisher for abstract | Abstract produced by a different publisher than the cited artifact |
| language | Different language | Additional form of abstract in a different language |
| autotranslated | Different language derived from autotranslation | Machine translated form of abstract in a different language, language element codes the language into which it was translated by machine |
| duplicate-pmid | Different text in additional Medline entry | Alternative form of abstract in two or more Medline entries |
| earlier-abstract | Different text in an earlier version | Alternative form of abstract in an earlier version such as epub ahead of print |