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arxiv: 2605.22047 · v1 · pith:ADHRUFSAnew · submitted 2026-05-21 · 💻 cs.AI

Active Evidence-Seeking and Diagnostic Reasoning in Large Language Models for Clinical Decision Support

Pith reviewed 2026-05-22 06:17 UTC · model grok-4.3

classification 💻 cs.AI
keywords large language modelsclinical decision supportdiagnostic reasoninginteractive evaluationevidence seekingstandardized patient simulatormedical AIpremature diagnostic closure
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The pith

Multi-turn evidence seeking reduces LLM diagnostic accuracy by 12.75% compared to full-context evaluation.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper introduces an OSCE-inspired standardized patient simulator to evaluate large language models on active diagnostic inquiry rather than static medical exams. Across 468 cases and 15 models, multi-turn interactions lower accuracy by 12.75 percent and supporting-evidence quality by 24.36 percent relative to giving the model all information upfront. These drops trace to premature diagnostic closure and inefficient questioning patterns. The findings indicate that full-context benchmarks likely overestimate how well models will perform when gathering information iteratively in clinical settings.

Core claim

Multi-turn evidence seeking in an interactive standardized patient simulator reduces diagnostic accuracy by 12.75% and supporting-evidence quality by 24.36% relative to full-context evaluation across 468 cases and 15 models, with error analyses linking the declines to premature diagnostic closure and inefficient questioning.

What carries the argument

OSCE-inspired standardized patient simulator that supports controlled multi-turn diagnostic interactions under uncertainty.

If this is right

  • Static full-context medical benchmarks overestimate model readiness for real clinical workflows.
  • Models exhibit premature closure when they must actively gather evidence rather than receive it all at once.
  • Interactive evaluation protocols are needed alongside static tests to assess safer clinical decision support.
  • Inefficient questioning strategies become visible only when models operate without complete context.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Training objectives that reward sustained uncertainty rather than quick answers could reduce the observed gaps.
  • Extending the simulator to include noisy or contradictory patient responses would test robustness beyond the current setup.
  • Deployment guidelines might require human oversight specifically during the evidence-gathering phase.

Load-bearing premise

The simulator captures enough of the uncertainty and dynamics of real clinical encounters for the observed performance gaps to apply outside the benchmark.

What would settle it

A direct comparison showing no accuracy or evidence-quality drop when the same models interact with real patients under matched conditions would falsify the claim that static benchmarks overestimate interactive performance.

read the original abstract

Large language models perform well on static medical examinations, yet clinical diagnosis often requires iterative evidence gathering under uncertainty. Building on prior interactive evaluation efforts, we introduce an OSCE-inspired standardized patient simulator and a controlled, reproducible benchmark for active diagnostic inquiry. Across 468 cases and 15 models in our protocol, we observe that multi-turn evidence seeking reduces diagnostic accuracy by 12.75% and lowers supporting-evidence quality by 24.36% relative to full-context evaluation; error analyses associate these drops with premature diagnostic closure and inefficient questioning. Together, these results suggest that static full-context benchmarks may overestimate performance in interactive evidence-seeking settings, motivating complementary interactive assessment for safer clinical decision support.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 2 minor

Summary. The paper introduces an OSCE-inspired standardized patient simulator and a controlled benchmark to evaluate active diagnostic inquiry in LLMs. Across 468 cases and 15 models, multi-turn evidence seeking is reported to reduce diagnostic accuracy by 12.75% and supporting-evidence quality by 24.36% relative to full-context evaluation; error analyses link the drops to premature diagnostic closure and inefficient questioning. The authors conclude that static full-context benchmarks may overestimate performance in interactive clinical settings.

Significance. If the simulator faithfully models real clinical uncertainty, the work provides concrete empirical evidence that interactive evaluation is needed to complement static benchmarks for safer clinical decision support. The scale (468 cases, 15 models) and explicit error analysis are strengths that make the protocol-comparison claim falsifiable and reproducible in principle.

major comments (1)
  1. The central generalization—that static benchmarks overestimate interactive performance—rests on the OSCE-inspired simulator reproducing the distribution of patient answers, hedging, and information gaps seen in real encounters. No section reports calibration against human-standardized-patient transcripts, inter-rater agreement on simulator outputs, or sensitivity analysis to patient-model prompt variations. Without such checks, the measured 12.75% accuracy drop and 24.36% evidence-quality drop risk being benchmark artifacts rather than clinically meaningful differences.
minor comments (2)
  1. Clarify whether the reported 12.75% and 24.36% figures are absolute percentage-point differences or relative reductions, and include confidence intervals or statistical tests for the comparisons.
  2. The error-analysis section would benefit from explicit quantitative criteria or annotated examples used to identify 'premature diagnostic closure' and 'inefficient questioning' in model traces.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the constructive and detailed feedback. We address the major comment below and indicate where revisions will be made to strengthen the manuscript.

read point-by-point responses
  1. Referee: The central generalization—that static benchmarks overestimate interactive performance—rests on the OSCE-inspired simulator reproducing the distribution of patient answers, hedging, and information gaps seen in real encounters. No section reports calibration against human-standardized-patient transcripts, inter-rater agreement on simulator outputs, or sensitivity analysis to patient-model prompt variations. Without such checks, the measured 12.75% accuracy drop and 24.36% evidence-quality drop risk being benchmark artifacts rather than clinically meaningful differences.

    Authors: We acknowledge that the manuscript does not report explicit calibration of simulator outputs against human-standardized-patient transcripts or inter-rater agreement statistics on those outputs. This is a substantive limitation for claims about ecological validity. In revision we will add a dedicated Limitations subsection that states this gap explicitly, describes the OSCE-inspired design choices used to approximate real encounters, and outlines planned follow-up calibration work using publicly available standardized-patient transcripts. On sensitivity analysis, internal prompt-variation checks were performed during benchmark construction; we will include a formal sensitivity table in the supplementary material showing that the reported accuracy and evidence-quality drops remain directionally consistent across reasonable prompt rephrasings. We maintain that the controlled, reproducible protocol still supplies falsifiable evidence that interactive settings differ from full-context ones, even while recognizing that stronger real-world anchoring would further support generalization. revision: partial

Circularity Check

0 steps flagged

No circularity: direct empirical comparison of evaluation protocols

full rationale

The paper reports measured differences in diagnostic accuracy (12.75% drop) and evidence quality (24.36% drop) between multi-turn evidence-seeking and full-context evaluation on the same 468 cases across 15 models. These are straightforward experimental outcomes from running the introduced OSCE-inspired simulator benchmark; no equations, fitted parameters, or predictions reduce to inputs by construction. The protocol is self-contained as an empirical study with no load-bearing self-citations or ansatz smuggling. The simulator's external fidelity is a separate validity concern, not a circularity issue in the reported results.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 1 invented entities

The central claim rests on the simulator being a valid proxy for clinical reality and on the chosen metrics for diagnostic accuracy and evidence quality being appropriate.

axioms (1)
  • domain assumption The standardized patient simulator accurately represents real-world clinical diagnostic interactions under uncertainty.
    Invoked to support generalization from benchmark results to clinical decision support.
invented entities (1)
  • OSCE-inspired standardized patient simulator no independent evidence
    purpose: Enable controlled multi-turn active diagnostic inquiry testing.
    Newly constructed for this benchmark; no independent evidence provided beyond the paper's own protocol.

pith-pipeline@v0.9.0 · 5671 in / 1294 out tokens · 54160 ms · 2026-05-22T06:17:47.405063+00:00 · methodology

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Reference graph

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69 extracted references · 69 canonical work pages · 11 internal anchors

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    Patient Information - [Sex, Age] (or “None”)

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    Chief Complaint - [Primary symptom] + [Duration] (or “None”)

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    History of Present Illness - Progression: [Chronological illness course] - Accompanying symptoms: [Comma-separated symptoms] (Use “None” if not available)

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    Past Medical History - [Relevant history] (or “None”)

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    Past Medical History - Smoking history (None otherwise)

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    Cardiovascular System - Includes: Acute coronary syndrome, heart failure, arrhythmias (e.g., atrial fibrillation), hypertensive emergencies, aortic dissection, pericarditis, etc

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    Respiratory System - Includes: Asthma, COPD, pneumonia, pulmonary embolism, spontaneous pneumothorax, hemoptysis- related diseases, etc

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    Gastro-Hepatobiliary System - Includes: Upper or lower GI bleeding, appendicitis, cholecystitis, pancreatitis, liver cirrhosis and complications, inflammatory bowel disease, abdominal pain, diarrhea, etc

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    Neurological System - Includes: Ischemic stroke, TIA, seizures/epilepsy, subarachnoid hemorrhage, headaches, dizzi- ness/vertigo, migraine, CNS infections, etc

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    Infectious Diseases - Includes: Bacterial meningitis, urinary tract infections, community or hospital-acquired pneumonia, skin and soft tissue infections, early sepsis, tropical diseases (e.g., dengue, malaria), etc

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    primary diagnosis

    Metabolic, Renal & Genitourinary System - Includes: Diabetes mellitus (DKA, HHS), hypoglycemia, thyroid disorders (hyper/hypothyroidism), electrolyte disorders (e.g., hyponatremia, hyperkalemia), acute kidney injury, kidney stones, urinary tract diseases, etc. If a disease does not fit into any of the above six categories, classify it as:Other Please retu...

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    - YouMUSTinclude the exact tag[Final Diagnosis]with brackets — do not rephrase, omit, or replace it. Fig. B8: Clinician prompt forTask 1(full context). The agent reads the complete structured record and must output[Final Diagnosis]followed by exactly three evidential items, using the mandatory tag verbatim. 35 Task 2 — Active Evidence-Seeking Clinician Pr...

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    This test was not performed yet

    • YouMUSTinclude the exact tag[Final Diagnosis]with brackets — do not rephrase, omit, or replace it. Note: • To improve diagnostic efficiency, please perform tests only when necessary for diagnosis. • You may only requestone specific test per turn. • Do NOTrepeat tests or other modules. • When confident, issue a[Final Diagnosis]. • You must complete the d...