Peer-review is the system used to assess the quality of a manuscript before it is published. Independent researchers in the relevant research area assess submitted manuscripts for originality, validity and significance in order to help editors determine whether the manuscript should be published in their journal.

Psychiatria Fennica operates a single-blind peer-review system, where the reviewers will get knowledge of the names and affiliations of the authors, but the reviewer reports provided to the authors are anonymous. Submitted manuscripts will generally be reviewed by one to two experts who will be asked to evaluate whether the manuscript is scientifically sound and coherent, whether it duplicates already published work, and whether or not the manuscript is sufficiently clear for publication. Reviewers will also be asked to indicate how interesting and significant the manuscript is. The Editors will reach a decision based on these reports and, where necessary, they will consult with members of the Editorial Board.