Differential Diagnosis Construction Chain

validated medical chain v1.0.0 cc-by-sa

Block ID: cda951c1-3e77-4fa5-8435-a13b22133e8d

Community-contributed block. PromptDNA makes no guarantee of output quality or fitness for purpose. This block operates in a regulated domain. Nothing generated using this block constitutes professional medical, legal, or financial advice. User assumes all responsibility for use.

This block carries additional risk (risk level: medium) and requires a stronger domain-specific disclaimer when used.

Template

Construct a structured differential for the presentation in {clinical_presentation} as a reasoning exercise, not a diagnosis. (1) Restate the problem in clinical terms: the key features, their timing, and the patient's relevant context, since a sloppy problem representation misdirects everything after it. (2) Generate a broad differential before narrowing, organized by mechanism or system rather than by first impression, so anchoring on the obvious answer doesn't hide alternatives. (3) Apply the "worst-first" principle explicitly: identify the can't-miss, time-critical, or life-threatening possibilities that must be considered or excluded even if unlikely, because the cost of missing them is catastrophic. (4) For each candidate, weigh how well it explains the full picture — which features it accounts for and which it can't — rather than fitting only the headline symptom. (5) Rank by a combination of probability and danger, keeping serious possibilities on the list until actively excluded. (6) State what additional history, examination findings, or testing would most efficiently discriminate among the top candidates. Emphasize throughout that this is an educational framework to support a qualified clinician's judgment, not a diagnosis, and that anyone with health concerns must be evaluated in person by a licensed professional.

Construct a structured differential for the presentation in {clinical_presentation} as a reasoning exercise, not a diagnosis. (1) Restate the problem in clinical terms: the key features, their timing, and the patient's relevant context, since a sloppy problem representation misdirects everything after it. (2) Generate a broad differential before narrowing, organized by mechanism or system rather than by first impression, so anchoring on the obvious answer doesn't hide alternatives. (3) Apply the "worst-first" principle explicitly: identify the can't-miss, time-critical, or life-threatening possibilities that must be considered or excluded even if unlikely, because the cost of missing them is catastrophic. (4) For each candidate, weigh how well it explains the full picture — which features it accounts for and which it can't — rather than fitting only the headline symptom. (5) Rank by a combination of probability and danger, keeping serious possibilities on the list until actively excluded. (6) State what additional history, examination findings, or testing would most efficiently discriminate among the top candidates. Emphasize throughout that this is an educational framework to support a qualified clinician's judgment, not a diagnosis, and that anyone with health concerns must be evaluated in person by a licensed professional.

Variables

Name	Type	Required	Trust level
clinical_presentation		yes

differential-diagnosisclinical-reasoningdiagnostic-frameworkchain-of-thought

Ratings

0.0

Overall (0)

0.0

Accuracy

0.0

Consistency

0.0

Clarity

0.0

Efficiency

Benchmarks

Not yet self-validated against any benchmark. Automated, evaluative only - not a factor in whether this block was published.

Submitted by James P FounderMod via mcp · 2026-07-18