QUADAS-3
A revised approach to risk-of-bias and applicability assessment for diagnostic test-accuracy evidence, organized around the review question, an ideal accuracy study, and the specific estimates assessed.
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What this is
A revised approach to risk-of-bias and applicability assessment for diagnostic test-accuracy evidence, organized around the review question, an ideal accuracy study, and the specific estimates assessed. QUADAS-3 uses six phases: define the synthesis question; specify the ideal test-accuracy study/trial; draw a flow diagram; identify accuracy estimates; assess bias and applicability; and make an overall judgment. The ideal study is an appraisal benchmark, not a claim that every diagnostic study must randomize. Use the current official instrument for exact questions and decision rules.
When to use
Use when systematically appraising diagnostic test-accuracy evidence for an explicit review or synthesis question. Specify the index test, reference standard, target condition, population, thresholds, timing, and estimates. Compare the actual flow and exclusions with the ideal study and document how each difference could affect the estimate or applicability.
What it requires and practical domains
The analyst or appraiser should keep the question, population, outcome or model result, source documents, version, and judgments connected. Use the domains below to organize that evidence. They are a condensed implementation crosswalk; consult the linked official source for exact instrument text, permissions, and decision rules. Retain disagreements and missing information rather than converting them into favorable answers.
When NOT to use and limitations
Do not replace STARD reporting with an appraisal label, equate high accuracy with low risk of bias, use the same undifferentiated judgment for incompatible thresholds or estimates, or apply a numeric sum as a validated quality score. A completed form documents an assessment; it does not create missing study evidence, guarantee future performance, or authorize a clinical, regulatory, or reimbursement conclusion. Applicability remains a separate question from internal validity and reporting completeness.
How it maps to this catalog
Follow the related concepts to implement definitions, analysis, diagnostics, and interpretation. For this entry the companion routes are diagnostic-accuracy, sensitivity-specificity-rwe, ppv-npv-rwe, stard, prisma-dta. Preserve the distinction between the guidance/tool and the methods that implement it; source-backed concepts explain those methods, while this resource organizes reporting or appraisal evidence.
Evidence record
For each applicable domain record the exact evidence location, relevant study/model version, judgment and rationale, uncertainty, unresolved issue, responsible reviewer, and review date. Do not invent approvals, validation results, or completed analyses to fill a field. Store the actual operational specification separately from the assessment, so a favorable label cannot silently replace the underlying evidence.
Checklist
- Define the diagnostic synthesis question and the intended population and use.
- Specify the ideal study and draw the actual participant/test flow.
- Identify the sensitivity/specificity or other accuracy estimate under appraisal.
- Assess bias and applicability using the exact current QUADAS-3 instrument.
- Record supporting evidence, judgment rationale, and the implications for synthesis.