Evidence-based practice (EBP) in nursing is a problem-solving approach to patient care that combines the best available research evidence with the nurse's clinical expertise and the patient's own preferences and values. The definition of evidence-based practice in nursing grew out of evidence-based medicine, which David Sackett and colleagues described as "the conscientious, explicit, and judicious use of current best evidence in making decisions about the care of individual patients." In practice, EBP means you can explain why you do what you do, and that the reason is better than "we've always done it this way."
This article explains the definition in plain terms, walks through the seven steps of evidence-based practice, shows how levels of evidence work, and describes well-documented evidence-based practice examples from real hospitals. It ends with the EBP models nurses use and a short guide to writing an EBP paper.
Most nursing programs teach two closely related definitions. The first is Sackett's, from the 1996 BMJ editorial "Evidence based medicine: what it is and what it isn't". Sackett stressed that evidence alone is never enough: it has to be combined with individual clinical expertise, and external evidence can inform, but never replace, individual clinical expertise.
The second comes from nursing scholars Bernadette Melnyk and Ellen Fineout-Overholt, whose American Journal of Nursing series introduced the seven steps of evidence-based practice. They describe EBP as a problem-solving approach that brings together evidence from well-designed studies and patient care data with clinician expertise and patient preferences and values. Their definition widens Sackett's in two useful ways: it counts internal data, such as your unit's infection or fall rates, as evidence, and it frames EBP as a process a whole organization takes part in, not only a decision one clinician makes.
Put together, evidence-based practice in nursing rests on three components:
All three are needed. Strong evidence for early mobility, for example, still has to be applied to a patient who may be anxious about walking, and a nurse has to judge whether today's vital signs make it safe.
Care that is not based on evidence varies from nurse to nurse and unit to unit, and outdated habits can persist for years. The Institute of Medicine's Roundtable on Evidence-Based Medicine set a goal that by 2020, 90 percent of clinical decisions would be supported by accurate, timely and up-to-date clinical information and reflect the best available evidence. EBP is also built into nursing education standards: the AACN Essentials place evidence-based practice within the domain of scholarship for the nursing discipline, which applies to both entry-level and advanced nursing education.
Students often mix these up in papers. They overlap, but each answers a different question.
| Approach | Main question | What it produces |
|---|---|---|
| Research | What is true? Does this intervention work? | New, generalizable knowledge, usually with ethics board approval |
| Evidence-based practice | What does the existing evidence say we should do here? | A practice change based on appraised evidence, adapted to the setting |
| Quality improvement | Is our process working, and how can we make it better? | Local improvement measured with internal data, often in rapid cycles |
Melnyk and colleagues numbered their steps from 0 to 6. Step 0 comes first because nobody asks a clinical question without curiosity and a workplace culture that allows it.
A spirit of inquiry means questioning routine practice. Why are patients woken at 4 a.m. for vital signs? Why does one unit use a different fall-prevention checklist from another? Organizations support this step with EBP mentors, journal clubs and leaders who treat questions as useful rather than disruptive.
Turn the concern into a focused, searchable question that names the population, intervention, comparison, outcome and time. Our guide on how to formulate PICOT questions explains the method, and these PICOT question examples show weak drafts rewritten into strong ones.
Use your PICOT terms to search databases such as CINAHL, PubMed and the Cochrane Library. Start with the strongest, most synthesized sources: clinical practice guidelines and systematic reviews. Combine keywords and subject headings, and keep a record of your search so it can be repeated.
Rapid critical appraisal asks three questions of each study: Are the results valid? What are the results? Will they help me care for my patients? Rate each source's level of evidence and quality, then look across the whole body of evidence for consistency. Our guide on how to write an article critique covers appraisal of individual studies, and this literature review example shows how to synthesize several sources.
Decide what the evidence supports and how it fits your patients, your setting and your resources. This is where a practice change is designed, piloted and put into a protocol, policy or care plan. At the bedside, it is also where you check whether a specific patient agrees with and can follow the recommended approach.
Measure whether the change produced the expected results. Pick outcomes before you start, such as infection rates per 1,000 catheter-days, falls per 1,000 patient-days or patient-reported pain scores, and compare them with baseline data.
Share what happened, whether or not it worked. Dissemination can be a unit presentation, a poster at a conference, a hospital newsletter or a journal article. Without this step, other units repeat the same work or never learn from it.
A level of evidence hierarchy ranks study designs by how well they protect against bias when answering a particular type of question. The most widely taught nursing hierarchy is Melnyk and Fineout-Overholt's seven levels for intervention (treatment) questions, reproduced in many university library guides such as the University of Colorado Anschutz levels of evidence guide.
| Level | Type of evidence | Example |
|---|---|---|
| I | Systematic review or meta-analysis of randomized controlled trials (RCTs) | A Cochrane review pooling RCTs of a fall-prevention intervention |
| II | Well-designed RCT | A trial randomizing ventilated ICU patients to early or usual-timing therapy |
| III | Controlled trial without randomization (quasi-experimental) | A before-and-after study with a comparison unit |
| IV | Case-control or cohort study | Following patients with and without a risk factor over time |
| V | Systematic review of descriptive or qualitative studies | A synthesis of interview studies on patient experience |
| VI | Single descriptive or qualitative study | A survey of nurses' attitudes toward bedside handoff |
| VII | Opinion of authorities or expert committee reports | A position statement from a professional organization |
Three points help when you apply this table:
The following evidence-based practice examples are well documented in the literature and in national guidelines. Each shows the same pattern: a clinical problem, evidence that a different approach works better, a change in nursing practice and measured results.
Central line-associated bloodstream infections (CLABSI) were long seen as an unavoidable risk of intensive care. In the Michigan Keystone ICU project, Pronovost and colleagues introduced a set of evidence-based insertion practices plus a checklist, and nurses were empowered to stop a procedure if a step was missed. Across 103 ICUs, the median infection rate fell from 2.7 per 1,000 catheter-days at baseline to 0 within three months, and the mean rate fell from 7.7 to 1.4 at 16 to 18 months.
The practices in central line bundles come from the CDC Guidelines for the Prevention of Intravascular Catheter-Related Infections, which include hand hygiene, maximal sterile barrier precautions during insertion, a chlorhexidine-alcohol skin preparation, avoiding the femoral vein in adults, and promptly removing any line that is no longer essential. For nurses, the EBP lessons are the daily review of line necessity and speaking up when a step is skipped.
Bed rest used to be the default for patients on mechanical ventilation. A randomized controlled trial by Schweickert and colleagues compared physical and occupational therapy started within the first days of ventilation with therapy started later. Fifty-nine percent of patients in the early-therapy group returned to independent functional status by hospital discharge, compared with 35 percent of controls, and the early group also had shorter delirium.
Evidence like this led to early mobility protocols, often combined with daily sedation interruption and delirium screening. The AHRQ early mobility training module describes how ICU teams put this into practice, with nurses screening patients for safety each day and progressing activity step by step, from sitting at the edge of the bed to walking.
Hospital-acquired pressure injuries cause pain, infection and longer stays, and many can be prevented with consistent nursing care. The AHRQ toolkit Preventing Pressure Ulcers in Hospitals organizes best practice into a bundle: a comprehensive skin assessment, a standardized risk assessment such as the Braden Scale, and an individualized care plan that addresses each area of risk. Typical nursing actions include scheduled repositioning, pressure-redistributing support surfaces, managing moisture and incontinence, nutrition screening and offloading heels.
These practices are graded in the international pressure injury guideline published jointly by the NPIAP, EPUAP and PPPIA, whose fourth edition is being released as a living online guideline. Pressure injury prevention is a good example of how evidence, nursing judgment and patient preferences meet: a patient in pain may decline frequent turns, so the nurse adjusts the schedule, the surface and pain management together.
| Clinical problem | Evidence-based change | Outcome to measure |
|---|---|---|
| Catheter-associated urinary tract infection | Nurse-driven protocol to remove urinary catheters that are no longer needed | CAUTI per 1,000 catheter-days; catheter days |
| Heart failure readmissions | Teach-back discharge education | 30-day readmission rate |
| Inpatient falls | Individualized fall-prevention plan based on a validated risk tool | Falls per 1,000 patient-days |
| Handoff errors | Structured bedside handoff using a standard tool | Missed information; patient satisfaction |
| Procedural pain in children | Distraction techniques during needle procedures | Self-reported pain scores |
If you use one of these for an assignment, find current guidelines and studies to support it rather than relying on the table. EBP changes also feed directly into care planning; our guide on how to write a nursing care plan shows how to write evidence-based rationales for each intervention.
EBP models give teams a structure for moving from a question to a sustained practice change. Melnyk's seven steps describe the process, while organizational models add guidance on teams, piloting and implementation. These are the EBP models students meet most often:
| Model | Core structure | Often used for |
|---|---|---|
| Iowa Model | Triggering issue, team, evidence review, pilot, then integration and sustained change; revised by the Iowa Model Collaborative in 2017 | Hospital-wide practice changes, especially ones that need a pilot |
| Johns Hopkins EBP Model | PET process: practice question, evidence, translation | Structured team projects that need ready-made appraisal tools |
| ACE Star Model | Five points: discovery, evidence summary, translation, integration, evaluation | Showing how research becomes a guideline and then practice |
| Stetler Model | Practitioner-oriented phases from preparation to evaluation | Individual clinicians and educators using research in decisions |
| ARCC Model | Assessing culture and readiness, building EBP mentors, implementing and evaluating | Building EBP culture and capacity in an organization |
The 2017 Iowa Model revision is a common choice for capstone and DNP projects because its pilot stage maps neatly onto a project timeline. Whatever model you pick, explain why it fits your project rather than naming it in passing.
Most EBP assignments follow the same steps you've just read. A typical structure is:
Write it in APA format and make sure every claim about effectiveness is tied to a cited source. If this is your first EBP paper, ask your instructor which EBP model and evidence hierarchy the rubric expects before you start.
EBP papers, PICOT projects and evidence tables are common in BSN and graduate courses, and the appraisal step is where many students lose marks. If you would like someone to review your PICOT question, search strategy or synthesis, our nursing homework help service offers tutoring and feedback on each section. Use any outside help in line with your school's academic integrity policy.
Evidence-based practice in nursing means making care decisions by combining the best available research evidence with your clinical expertise and the patient's preferences and values.
Melnyk and colleagues list them as Step 0, cultivate a spirit of inquiry; Step 1, ask a PICOT question; Step 2, search for the best evidence; Step 3, critically appraise it; Step 4, integrate it with clinical expertise and patient preferences; Step 5, evaluate outcomes; and Step 6, disseminate the results.
Using a central line bundle is a classic example. Hand hygiene, full sterile barriers, chlorhexidine skin preparation, avoiding the femoral site in adults and removing unneeded lines are all recommended by CDC guidelines and have been linked to large reductions in bloodstream infections.
For intervention questions, Level I is a systematic review or meta-analysis of randomized controlled trials. For other types of questions, such as patient experience, a different design may provide the best evidence.
Research generates new knowledge through studies. EBP uses existing research and other evidence to decide how to care for patients in a particular setting.
Use the model your program or organization requires. If you can choose, the Iowa Model suits projects that pilot a change on one unit, and the Johns Hopkins model suits team projects that need ready-made appraisal tools.
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