Articles in peer-reviewed or scholarly journals almost always report original research. Articles will typically include the following:
Author(s) credentials or academic affiliation
A lengthy abstract
Report on the research methodology
Conclusion or results of the research
Footnotes or in-text references
A lengthy bibliography
Not all items that appear in peer reviewed journals are actually peer-reviewed. Articles that require a certain level of scholarly effort such as research studies,experiments and literature reviews are peer-reviewed. Items appearing in peer-reviewed journals that are not peer reviewed are;
Letters to the editor
Keep that in mind when you limit your search to peer review. The results list may contain some of the above items that are not peer reviewed. Make sure you check what type of item you are looking at before you assume it is peer-reviewed simply because it appears in a peer-reviewed journal.
Review articles and Peer-reviewed articles are not the same thing!
Review articles synthesize and analyze the results of multiple studies on a topic.
Peer-reviewed articles are articles of any kind that have been vetted for quality by an expert or number of experts in the field.
The bibliographies of review articles can be a great source of original, peer-reviewed empirical articles.
Rigorous Peer Review is Worth the Effort.
Res Nurs Health. 2016 Oct 14;39(1):393-5. doi: 10.1002/nur.21771.
Academic Primer Series: Key Papers About Peer Review.
Yarris LM, Gottlieb M, Scott K, Sampson C, Rose E, Chan TM, Ilgen J.
West J Emerg Med. 2017 Jun;18(4):721-8. doi: 10.5811/westjem.2017.2.33430.