Journals may be deselected from MEDLINE for various reasons including, but not limited to, extremely late publication patterns, major changes in the scientific quality or editorial process, and changes in ownership or publishers. NLM supports the publishing practices outlined by:

• Committee on Publication Ethics (COPE)
• International Committee of Medical Journal Editors (ICMJE)
• Council of Scientific Editors (CSE)
• National Information Standards Organization (NISO), in particular Recommended Practices for the Presentation and Identification of E-Journals (PIE-J)

NLM expects PubMed journals to follow current standard best publishing practices. Over time, NLM reviews currently indexed MEDLINE journals. It is possible that a journal's MEDLINE status could change.