Systematic vs Scoping Review: What Each Is and What the DNP Literature Review Actually Requires

Systematic Review: What It Is and Why It Matters for DNP Students

A systematic review is a rigorous, reproducible synthesis of all available primary research on a specific clinical question, conducted according to a pre-registered protocol, with explicit inclusion and exclusion criteria, comprehensive database searching, and formal risk of bias assessment for each included study. Systematic reviews follow PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) reporting guidelines and are registered in PROSPERO before data collection begins. The defining characteristic of a systematic review is reproducibility: another researcher following the same protocol should be able to identify the same included studies and reach the same synthesis conclusions.

For DNP students, systematic reviews are the highest-level evidence in the evidence hierarchy (Level I in the Johns Hopkins EBP model) and are the primary source that supports the "sufficient evidence" determination in the Iowa Model. When your PICOT question has existing systematic reviews addressing it, those reviews are the anchor of your literature review, they provide pre-synthesised evidence that you then supplement with primary studies published after the review's search date. When no systematic review exists for your PICOT question, the absence itself is a finding that strengthens the significance of your DNP project.

DNP students do not conduct systematic reviews as their capstone project. A systematic review is a research methodology (it generates new evidence by synthesising existing research. The DNP capstone is a practice improvement project) it implements and evaluates a change in clinical practice. A DNP student who proposes to "conduct a systematic review of the literature on CAUTI prevention" as their DNP capstone is proposing a research project, not a practice improvement project. The systematic review is evidence the student reads and synthesises in Chapter 2; it is not the project itself.

Scoping Review: What It Is and When It Is Used

A scoping review maps the existing literature on a broad topic to identify what types of evidence exist, what the scope of the literature covers, and where the gaps are, without the goal of answering a specific clinical question with a synthesised answer. Scoping reviews follow PRISMA for Scoping Reviews (PRISMA-ScR) reporting guidelines and do not require risk of bias assessment for individual studies. Scoping reviews are appropriate when the evidence base is heterogeneous, when the goal is to describe the landscape of evidence rather than synthesise it, or when a systematic review is not yet feasible because the topic is too new or too broad.

For DNP students, scoping reviews found in the literature signal that the evidence base on a topic is still developing or highly variable, which means the systematic review-level evidence you need to anchor your DNP literature review may not yet exist. In this case, the scoping review itself becomes a primary resource in your literature review chapter, used to establish the current state of evidence and justify why your project is implementing based on the best available evidence rather than on high-certainty systematic review conclusions. DNP students do not typically conduct scoping reviews as their capstone project, for the same reason they do not conduct systematic reviews, scoping reviews are evidence synthesis methods, not practice improvement projects.

Integrative Review: What It Is and How It Differs

An integrative review synthesises both experimental and non-experimental research, as well as theoretical and clinical literature, to build a comprehensive understanding of a concept, phenomenon, or clinical problem. Unlike systematic reviews (which restrict inclusion to specific study designs and conduct formal risk of bias assessment), integrative reviews can include diverse methodologies (quantitative studies, qualitative studies, theoretical papers, and clinical reports) synthesised to generate new understanding. Whittemore and Knafl (2005) provide the most commonly cited methodological framework for nursing integrative reviews.

Integrative reviews are common in nursing literature for topics where the evidence base is methodologically diverse, for example, a DNP project on nurse-patient communication in palliative care settings might find that the available evidence includes qualitative studies of patient experiences, quantitative studies of communication tool effectiveness, and theoretical frameworks for compassionate communication, all of which are relevant but cannot be synthesised in a systematic review that restricts inclusion to RCTs. The DNP literature review chapter is functionally similar to an integrative review in that it synthesises diverse evidence types, but it is not formally called an integrative review and does not require formal integrative review methodology.

Meta-Analysis: What It Is and How It Differs from a Systematic Review

A meta-analysis is a statistical procedure, not a literature review methodology. Meta-analyses use statistical pooling to combine the quantitative results of multiple primary studies into a single summary effect size, typically reported as a pooled odds ratio, relative risk, mean difference, or standardised mean difference with 95% confidence interval. A meta-analysis is always conducted within a systematic review (because systematic review methods are needed to identify the studies to pool), but not all systematic reviews include a meta-analysis (when studies are too methodologically heterogeneous to pool statistically, the systematic review reports a narrative synthesis instead).

For DNP students, meta-analyses found in the literature are the strongest quantitative evidence that an intervention works, a meta-analysis pooling 12 RCTs showing that nurse-driven catheter removal protocols reduce CAUTI rates with a pooled relative risk of 0.68 (95% CI [0.59, 0.79]) is the most compelling evidence available for your DNP QI project's significance argument. When a meta-analysis exists for your intervention, cite it prominently in the significance section and in the evidence synthesis table as Level I evidence.

The DNP Literature Review: What Type of Review It Actually Is

The DNP capstone literature review chapter is a structured, narrative synthesis of evidence relevant to the PICOT question, not a systematic review, scoping review, or integrative review in the formal methodological sense. It follows a PRISMA-inspired search documentation process (databases searched, search terms, date range, inclusion/exclusion criteria, number of studies identified and included) but does not require PROSPERO pre-registration, formal risk of bias assessment using a validated tool (like the Cochrane RoB 2 tool), or the complete PRISMA 27-item checklist. Most DNP programs require a simplified PRISMA flow diagram showing how many records were identified, screened, excluded, and included, but this is a documentation requirement, not a requirement that the student is conducting a formal systematic review.

The DNP literature review is a targeted evidence synthesis: it systematically identifies and synthesises the best available evidence on the specific PICOT intervention and outcome, organises that evidence thematically (not by individual study), draws conclusions about what the evidence supports, and connects those conclusions to the proposed practice change in Chapter 3. The primary quality criteria are: comprehensiveness (did the student search the right databases with appropriate terms?), recency (are studies within the last 5 to 7 years?), relevance (do the included studies address the PICOT population, intervention, and outcome?), and synthesis quality (are findings integrated across studies into themes, not summarised study by study?).