QUADAS-2
QUADAS-2 is a checklist used to assess the quality of studies that evaluate diagnostic tests. It helps reviewers judge how reliable and applicable the results of these studies are by looking at four key areas: how patients were selected, the diagnostic test being studied, the reference standard used for comparison, and the flow of patients through the study.
At a glance
Use when
Conducting systematic reviews of diagnostic test accuracy; when assessing methodological quality of primary diagnostic studies.
Avoid when
Evaluating therapeutic interventions, prognostic studies, or non-diagnostic research; when study reports lack sufficient detail for judgment.
Inputs
Primary diagnostic accuracy studies, review question details
Outputs
Risk of bias and applicability assessments per study
How it works
QUADAS-2 evaluates diagnostic accuracy studies across four domains: patient selection, index test, reference standard, and flow and timing. Each domain is assessed for risk of bias; the first three also include applicability concerns. Signalling questions guide judgments. The tool is applied in four phases: clarifying the review question, adapting the tool for the review, constructing a study flow diagram, and making bias and applicability judgments.
- HTA domains
- Clinical Effectiveness
- Categories
- Data Quality Assessment
- Assumptions
- The tool assumes that bias and applicability can be systematically judged using predefined domains and signalling questions; that the review question is clearly defined; and that study details are sufficiently reported.
- Strengths
- Structured, transparent assessment of bias and applicability; tailored for diagnostic accuracy studies; includes guidance for adaptation to specific reviews; widely accepted in systematic reviews.
- Limitations
- Requires trained reviewers; subjective judgments may vary; depends on adequate reporting in primary studies; not suitable for non-diagnostic studies.
- Also known as
- Quality Assessment of Diagnostic Accuracy Studies-2
Questions this answers
- › Does the study clearly describe how patients were selected?
- › Was the index test performed and interpreted without knowledge of the reference standard result?
- › Was the reference standard appropriate for the condition being diagnosed?
- › Were all patients included in the analysis?
- › Were there concerns about the applicability of the patient selection to the review question?
- › Was there a delay between the index test and the reference standard that could affect results?
References & sources
Similar by meaning
Beta record. Generated from the primary source via AI extraction and independent audit, pending final human review.