Nursing research databases are where your evidence comes from, and the database you choose decides what you find. Searching one source with a few loose keywords is the quickest way to miss the studies your marker expects to see.
This guide compares the databases most used in nursing, shows how to turn a PICOT question into a structured search, walks through a search step by step and explains how to sift and judge the results.
The Databases Most Nursing Searches Start With
Most nursing literature searches start with CINAHL for nursing and allied health research and PubMed for the wider biomedical literature. Add the Cochrane Library for systematic reviews, and APA PsycInfo for mental health or behavior topics.
Use subject headings as well as keywords, combine terms with Boolean operators and record your search so it can be repeated.
Why Database Choice Matters
No single database indexes everything. CINAHL covers many nursing journals that PubMed does not, while PubMed indexes far more medical and pharmacology research. A topic such as medication safety may need both.
Database choice also shapes the type of evidence you find. The Cochrane Library is the natural home of systematic reviews, while PsycInfo brings in qualitative and behavioral studies that clinical databases can miss. Matching the database to your topic is part of the skill being marked.
Your marker also wants to see that you searched systematically. Naming the databases you used, and why, shows that your evidence is not just the first few results from a general search engine.
Nursing Research Databases Compared
| Database | Best for | Subject headings | Access |
|---|---|---|---|
| CINAHL | Nursing and allied health research | CINAHL Subject Headings | Usually through your library |
| PubMed (MEDLINE) | Biomedical and clinical research | MeSH | Free online |
| Cochrane Library | Systematic reviews and trials | MeSH | Abstracts free; full access varies by country and library |
| APA PsycInfo | Mental health, psychology and behavior | APA Thesaurus terms | Usually through your library |
| Embase | Drug and device research, wide European coverage | Emtree | Usually through your library |
| JBI EBP Database | Evidence summaries and best practice sheets | Varies by platform | Usually through your library |
| Google Scholar | A broad check and finding full texts | None | Free online |
Your library may offer other useful collections, such as ProQuest's nursing databases or the TRIP database for clinical guidelines. Ask a subject librarian which ones your institution subscribes to.
From PICOT Question to Search Terms
A good search begins with your question, not with the search box. Break the PICOT question into its main concepts, then list synonyms and subject headings for each one.
PICOT question: In older adults in hospital (P), does hourly rounding (I), compared with usual care (C), reduce falls (O)?
| Concept | Keywords and synonyms |
|---|---|
| Population | aged, elderly, "older adult*", geriatric, inpatient* |
| Intervention | "hourly rounding", "intentional rounding", "purposeful rounding" |
| Outcome | fall*, "accidental falls", "fall prevention" |
Search string: ("hourly rounding" OR "intentional rounding" OR "purposeful rounding") AND (fall* OR "accidental falls") AND (aged OR elderly OR "older adult*")
The comparison element is usually left out of the search. Including "usual care" would exclude good studies that describe their control group differently.
Search Tools That Make the Difference
- AND narrows the search: every concept must appear.
- OR widens it: any of the synonyms can appear.
- NOT excludes a term, but use it sparingly, as it can remove relevant studies.
- Quotation marks search an exact phrase, such as "pressure injury".
- Truncation, usually an asterisk, finds word endings: nurs* finds nurse, nurses and nursing.
- Subject headings find articles indexed under a concept even if the author used different words.
Use subject headings and keywords together. Headings catch well-indexed studies; keywords catch new articles not yet indexed and terms the headings miss.
Running a Database Search Step by Step
- Write your concept table with keywords and synonyms.
- Search each concept separately, combining its synonyms with OR.
- Look up the matching subject heading for each concept and add it with OR.
- Combine the concept searches with AND.
- Apply limits: publication date, language, peer review and age group where relevant.
- Screen titles and abstracts against your inclusion criteria.
- Read the full texts of likely studies and record why you exclude any.
- Repeat the search in your second database, adapting headings to its thesaurus.
- Check the reference lists of key studies for anything you missed.
Save your searches in each database, with the date and number of results. Many rubrics ask for a search table, and systematic reviews need a PRISMA flow diagram showing how many records you screened and excluded.
Judging What Your Search Returns
A long list of results is not evidence until you sift it. Set inclusion and exclusion criteria before you screen, so your choices are consistent.
| Question to ask | Why it matters |
|---|---|
| Is it peer-reviewed primary research or a systematic review? | Opinion pieces and news items rarely count as evidence |
| Does the population match yours? | Findings from children may not apply to older adults |
| Is it recent enough? | Many rubrics ask for the last five years |
| What level of evidence is it? | A systematic review of trials outweighs a single case report |
| Is the method sound? | Appraise with a tool such as a CASP or JBI checklist |
Keep a simple evidence table as you go: author and year, design, sample, key findings, level of evidence and limitations. It saves hours when you write the review.
Guidelines, Gray Literature and Full Texts
Journal databases are not the only source of good evidence. Clinical guidelines and reports from health bodies often summarize the best evidence and are directly relevant to practice.
- Clinical practice guidelines: national guideline bodies and professional nursing organizations publish evidence-based recommendations on common problems.
- Government and public health reports: useful for statistics on how common or costly a problem is.
- Theses and dissertations: sometimes contain detailed reviews, though they are not peer-reviewed journal articles.
- Conference abstracts: can point to new work, but often lack enough detail to appraise.
Check your rubric before relying on gray literature. Many programs want most sources to be peer-reviewed research, with guidelines used to support the clinical context.
Getting the Full Text
When a database shows only the abstract, look for your library's link resolver button, which checks every subscription your institution holds. If that fails, search the title in Google Scholar for an open-access version.
Interlibrary loan can supply articles your library does not hold, though it may take a few days. Plan for that if your deadline is close.
Never cite a study from its abstract alone. The abstract may leave out limitations or results that change how the study fits your argument.
Common Database Search Mistakes
| Mistake | Fix |
|---|---|
| Typing the whole question into the search box | Break it into concepts and synonyms |
| Searching only Google Scholar | Use CINAHL and PubMed, then Scholar as a check |
| Ignoring subject headings | Add CINAHL Headings or MeSH for each concept |
| Too many limits too early | Apply limits after you see the size of the result set |
| No record of the search | Save strings, dates and result counts |
| Using abstracts only | Read full texts before you cite a study |
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Frequently Asked Questions
CINAHL is the main nursing-specific database, and PubMed is essential for wider clinical research. Most nursing searches use both.
Yes. PubMed is free to search. Some full texts are free, while others need access through your library.
MeSH is the subject heading system used in PubMed. CINAHL has its own headings tailored to nursing. Each database's headings work only in that database.
It is useful for checking and finding full texts, but rely on CINAHL and PubMed for a systematic search. Many rubrics expect them.
At least two for most assignments, usually CINAHL and PubMed. Systematic reviews often search three or more.
Many rubrics ask for studies from the last five years. Older landmark studies can be included where they are central to the topic.
Rules set before screening that decide which studies you keep, such as population, design, language and publication date.
A flow diagram showing how many records were found, screened, excluded and included in a systematic review.
Usually because concepts are joined with OR instead of AND, or the terms are too general. Combine each concept with AND and use more specific phrases.
Yes. Send the question and rubric, and your writer delivers a custom review with a documented search and evidence table.