ATLS was created because trauma care was chaotic and unsafe. After a 1976 plane crash in rural Nebraska, Dr. James Styner realized his injured children received “worse care in a hospital than he could provide in the field.”
ATLS changed trauma care by creating a shared, systematic approach.
Emergency medicine still lacks that structure for symptoms, especially in rural ERs where clinicians often work alone with limited resources.
As an emergency physician, I built SymptomDx to do for symptoms what ATLS did for trauma: Organize medicine into a clear, repeatable standard of practice so nothing critical is missed, anywhere.
Surgeons do not skip timeouts because they are experienced. Pilots do not skip checklists because they are confident. Emergency physicians should not skip systematic approaches because they trust their pattern recognition. Excellence comes from systems, not heroics.
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Enter Patient Symptom
Start with the chief complaint or diagnosis to have every patient become an open-book exam.
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Review Clinical Evidence
Access comprehensive diagnostic approaches with supporting evidence.
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Access Evidence-Based Management Plan
Find evidence-based management protocols and treatment guidelines.
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Frequently Asked Questions
Everything you need to know about SymptomDx
Yes, SymptomDx is completely free. No subscription, no credit card, no hidden fees. Access all 450+ clinical decision support tools for emergency medicine at no cost.
SymptomDx provides 192 symptom-based diagnostic approaches covering the most common emergency department chief complaints: chest pain differential diagnosis, abdominal pain workup, headache red flags, syncope evaluation, dyspnea assessment, altered mental status differential, and more. Each approach includes systematic history questions, physical exam findings, risk stratification criteria, and evidence-based diagnostic pathways.
All protocols are authored by board-certified emergency physicians and reviewed by specialty-matched clinicians. Our medical content is developed by practicing emergency medicine physicians with clinical epidemiology training, not generated by AI. Every approach reflects current clinical guidelines from ACEP, AHA, ACOG, and other major medical societies.
UpToDate provides comprehensive medical reference content designed for in-depth reading. SymptomDx delivers rapid, checklist-based clinical decision support optimized for point-of-care use in the emergency department. When you have a patient with undifferentiated chest pain at 2 AM, SymptomDx gives you a systematic approach in seconds, not a 40-page review article.
AI chatbots generate responses dynamically, which introduces variability and potential for hallucination in clinical settings. SymptomDx provides pre-validated, physician-authored clinical protocols that deliver consistent, evidence-based guidance every time. Our diagnostic approaches are reproducible clinical infrastructure, not AI-generated suggestions that may vary between queries.
Our clinical decision support library covers 98%+ of emergency department presentations including: Cardiovascular (chest pain, syncope, palpitations, hypertensive emergency), Pulmonary (dyspnea, cough, hemoptysis, asthma exacerbation), Neurological (headache, dizziness, weakness, altered mental status, stroke), Gastrointestinal (abdominal pain, GI bleeding, nausea and vomiting), Genitourinary (flank pain, hematuria, urinary symptoms), Musculoskeletal (back pain, joint pain, trauma evaluation), Infectious disease (fever workup, sepsis screening), Psychiatric, Pediatric emergencies, OB/GYN emergencies, toxicology, and more.
We continuously update clinical protocols as new evidence emerges and guidelines change. Each approach displays its last review date and references current society recommendations and peer-reviewed literature.
Yes. SymptomDx pairs seamlessly with AI documentation tools including Freed, Heidi, Abridge, Nuance DAX Copilot, and Sunoh. Run SymptomDx in your browser alongside your AI scribe. Our systematic questions guide your patient encounter while your scribe captures the documentation.
Absolutely. SymptomDx works standalone as a rapid clinical reference and guided history-taking tool. Many emergency physicians use our checklist view as their go-to resource for systematic differential diagnosis and risk stratification.
The opposite. SymptomDx eliminates cognitive load during patient encounters. Instead of mentally running through differentials, you follow a systematic approach that ensures comprehensive evaluation. Physicians report more efficient encounters with fewer missed questions and more confident clinical decision-making.
Yes. SymptomDx is an excellent clinical reasoning tool for medical students. Our systematic approaches teach the structured thinking that attending physicians expect. Use SymptomDx to prepare for clinical rotations, structure patient presentations, study for shelf exams, and develop differential diagnosis skills.
Our evidence-based approaches reinforce the systematic clinical reasoning tested on USMLE Step 2 CK and shelf exams. Practice working through chief complaints using our diagnostic frameworks to build pattern recognition and ensure you're considering key differentials and can't-miss diagnoses.
SymptomDx is free for everyone (medical students, residents, and attending physicians). No student discount needed because there's no cost.
EM residents use SymptomDx to standardize their approach to common chief complaints, ensure systematic history-taking during high-volume shifts, and prepare for oral board examinations. Our clinical protocols reinforce the structured evaluation that residency programs teach while providing a reliable backup when fatigue sets in.
Yes. Our systematic diagnostic approaches mirror the structured clinical reasoning expected in oral board examinations. Practice articulating your differential diagnosis, identifying red flags, and explaining risk stratification using our evidence-based frameworks.
No. SymptomDx augments clinical judgment, it doesn't replace it. Think of our protocols like aviation checklists: pilots don't use checklists because they forgot how to fly, they use them because systematic approaches prevent errors. SymptomDx ensures comprehensive evaluation even during busy shifts.
Even experienced pilots use checklists on every flight. SymptomDx provides systematic backup for atypical presentations, keeps you current with evolving clinical guidelines, and ensures cognitive rigor during high-volume overnight shifts. It's not about what you don't know. It's about ensuring nothing gets missed when you're managing 30 patients.
SymptomDx is an educational clinical decision support tool that augments physician judgment (never replaces it). Systematic documentation of clinical reasoning, facilitated by structured diagnostic approaches, strengthens your medicolegal position by demonstrating thorough evaluation.
We monitor guideline updates from ACEP, AHA, ACOG, AAP, IDSA, and other major societies. When clinical recommendations change, we update our protocols. Each approach includes references to current evidence and displays its last review date.
No. SymptomDx is a clinical reference tool. We don't collect, store, or transmit any patient information. Your clinical decisions stay in your EMR where they belong.
SymptomDx currently requires an internet connection. Our browser-based platform loads quickly even on hospital WiFi, with most protocols available in under 3 seconds.
SymptomDx doesn't handle protected health information. We're a clinical reference tool, not an EMR integration. No patient data ever touches our platform.
We welcome input from the emergency medicine community. Use the feedback button in the app, reach out on Twitter, or email us directly. We read every suggestion and continuously expand our clinical content based on user needs.
Open symptomdx.com in your browser, search for a chief complaint you see frequently (chest pain, abdominal pain, headache) and work through the approach. Most physicians know within 60 seconds whether SymptomDx fits their clinical workflow.
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Dr. Lucas Mastropaolo
MD, CCFP(EM) | Founder & Medical Director
SymptomDx is a clinical decision support platform founded by Dr. Lucas Mastropaolo, MD, CCFP(EM), a Canadian emergency physician.
The platform was created to address a critical challenge in emergency and rural medicine: clinicians are often required to manage the sickest, most time-sensitive conditions with infrequent exposure to those presentations.
SymptomDx delivers structured, evidence-based approaches and management pathways for acute medical and traumatic conditions, designed to support safe, consistent decision-making at the point of care.
Content is physician-authored, clinically reviewed, and aligned with established emergency medicine guidelines.
Access evidence-based clinical decision support for emergency medicine.
