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P ubMed  was developed and is maintained by the National Center for Biotechnology Information (NCBI), at the U.S. National Library of Medicine (NLM), located at the National Institutes of Health (NIH).

Citations in PubMed primarily stem from the biomedicine and health fields, and related disciplines such as life sciences, behavioral sciences, chemical sciences, and bioengineering. 

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• PubMed Tips (2022) This document contains expert level information to search in PubMed.
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• Last Updated: Oct 3, 2023 4:16 PM
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Welcome to PubMed

PubMed comprises more than 37 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher websites.

PubMed: Find Research Articles

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Finding Comparative Effectiveness Research

Comparative effectiveness research is the conduct and synthesis of research comparing the benefits and harms of different interventions and strategies to prevent, diagnose, treat and monitor health conditions in "real world" settings.

Two specialized resources are available to inform comparative effectiveness research:

Comparative Effectiveness Research  on the PubMed Topic-Specific Queries page. Provides specialized PubMed searches of published research and research in progress to help inform investigations of comparative effectiveness.

• Medline Plus  is the world’s largest medical library, it brings you information about diseases, conditions, and wellness issues in language you can understand. MedlinePlus offers reliable, up-to-date health information, anytime, anywhere, for free.

3 Ways to Find Research Articles in PubMed

1. filter (limit) to article type.

Most citations in PubMed are for journal articles. However, you may limit your retrieval based on the type of material the article represents. Use the Filters on the Results page sidebar and look at the Article Types checklist which contains a list of frequently searched publication types.

For example, choose Randomized Controlled Trial or Clinical Trial or Meta-Analysis from the list.

2. PubMed Clinical Queries 

Enter your search terms and evidence-filtered citations will appear under Clinical Study Categories. Systematic Reviews or Medical Genetics. The Clinical Queries link is found on the PubMed home page or under the More Resources drop-down at the top of the Advanced Search page.

The resulting retrieval in PubMed Clinical Queries can be further refined using PubMed's Filters, e.g., English language, humans.

3. Limit to Articles with Structured Abstracts

Many abstracts that are added to PubMed include section labels such as BACKGROUND, OBJECTIVE, METHODS, RESULTS, and CONCLUSIONS. These 'structured' abstracts appear in many different article types such as review articles, original research, and practice guidelines and facilitate skimming of citations for relevance and specific information such as research design within the Methods section.  The presence of structured abstracts in citations are a searchable feature in PubMed.  To limit to citations containing structured abstracts, include the term hasstructuredabstract in the search box.

For example: valerian AND sleep AND hasstructuredabstract

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