Written and maintained by CASRAI Editorial Board
Last updated
The Schmitt-Thompson protocols—formally maintained and published by Schmitt-Thompson Clinical Content (STCC)—are the peer-reviewed, symptom-based clinical decision-support guidelines used across more than 90% of North American medical call centers, hospital nurse advice lines, accountable care organizations (ACOs), and ambulatory primary care practices to conduct standardized tele-triage (telephone and virtual triage). Co-authored by pediatrician Barton D. Schmitt, MD, FAAP (who developed the first pediatric telephone protocols at Children’s Hospital Colorado in the 1980s) and emergency medicine physician David A. Thompson, MD, FACEP (who authored the companion adult protocol set in the 1990s), the protocols provide registered nurses (RNs) and advanced practice clinicians with a deterministic, evidence-based algorithm for evaluating acute caller symptoms remotely without a visual physical examination.
Unlike consumer-facing probabilistic AI symptom checkers that rank differential diagnoses by statistical likelihood, Schmitt-Thompson protocols are engineered around risk-first clinical exclusion: the nurse steps sequentially from highest-acuity life-threatening red flags down to mild self-limiting symptoms, assigning a single standardized disposition (where and how soon the patient must be evaluated) paired with structured home-care instructions and safety-net call-back triggers.
What Are the Schmitt-Thompson Protocols and How Are They Structured?
Because a telephone or asynchronous message encounter lacks vital-sign monitors, auscultation, and direct palpation, telehealth nursing standards published by the American Academy of Ambulatory Care Nursing (AAACN) require nurses to use validated clinical decision-support trees rather than unstructured memory. The Schmitt-Thompson library comprises over 750 distinct symptom, disease, and exposure protocols divided into four specialized clinical editions that are reviewed and updated annually against current specialty society guidelines (AAP, ACEP, CDC, IDSA, ACOG):
- Pediatric After-Hours Protocols: Comprehensive symptom decision trees for infants, children, and adolescents (authored by Dr. Barton Schmitt), designed for 24/7 hospital call centers and covering neonatal red flags, weight-based OTC antipyretic tables, poisoning/ingestion routing, and acute infectious presentations.
- Adult After-Hours Protocols: Comprehensive symptom decision trees for adults (authored by Dr. David Thompson), covering cardiopulmonary emergencies, obstetric/postpartum symptoms, neurological deficits, and chronic disease exacerbations.
- Pediatric Office-Hours Protocols: Streamlined versions optimized for daytime outpatient clinic triage nurses and medical assistants (under RN/physician supervision) where same-day or next-day clinic appointment slots are directly available.
- Adult Office-Hours Protocols: Daytime ambulatory clinic editions designed to route acute patient calls efficiently between immediate emergency transfer, same-day acute clinic walk-in slots, scheduled provider visits, and home care.
Internal Anatomy of a Single Schmitt-Thompson Protocol
Every Schmitt-Thompson guideline follows a uniform six-part clinical informatics schema so a triage nurse can navigate any symptom consistently under high call volume:
- 1. Protocol Title, Cross-References, and Initial Assessment Questions: Defines inclusion/exclusion criteria (routing the nurse to a more specific protocol if needed, such as redirecting “Chest Pain” to “Shortness of Breath” if respiratory distress predominates) and prompts rapid initial questions (onset, severity, pertinent medical history).
- 2. Triage Assessment Questions (Top-Down Acuity Cascade): The core decision tree. Questions are grouped under descending disposition headings. The nurse evaluates each question from top to bottom. The First-Positive Stopping Rule: As soon as a caller answers “Yes” to any triage question (and the nurse confirms the clinical context), the triage cascade stops immediately at that acuity tier—preventing unnecessary interrogation during an acute emergency.
- 3. Background Clinical Information & Etiology: Concise reference notes for the triage nurse explaining common causes, clinical pearls, and differential considerations behind each question.
- 4. Care Advice (Disposition-Specific Instructions): Numbered, plain-language clinical instructions matched to the selected disposition (for example, first-aid measures while awaiting EMS, nothing-by-mouth [NPO] instructions prior to an Emergency Department visit, or hydration and symptom management for Home Care).
- 5. Call-Back / Safety-Net Instructions (“Call Back If”): Explicit red-flag warning signs that instruct the patient or parent when to escalate care immediately if symptoms worsen.
- 6. Author, Revision Date, and Peer-Reviewed References: Complete bibliographic citations documenting the clinical evidence base for the annual update.
The Schmitt-Thompson Acuity Disposition Tiers
While individual protocols may subdivide intermediate office-visit windows (such as “See Doctor Within 4 Hours” vs. “See Doctor Within 24 Hours”), all Schmitt-Thompson triage assessments map into five core clinical disposition categories that govern patient routing and health system capacity management:
| Acuity Tier | Standard Schmitt-Thompson Disposition | Target Timeframe to Evaluation | Clinical Criteria & Representative Red-Flag Triggers | Required Triage Nurse Action |
|---|---|---|---|---|
| Level 1 (Emergent / Life-Threatening) | Call 911 Now (EMS Dispatch) | Immediate (EMS transport) | Airway compromise, severe respiratory distress/cyanosis, crushing chest pain with diaphoresis, FAST stroke signs, unresponsiveness, active anaphylaxis | Initiate warm transfer to 911 PSAP or keep caller on line while dispatching EMS; provide immediate life-support first-aid instructions |
| Level 2 (Emergent / ED) | Go to ED Now (or ED /ucc Evaluation) | Immediate (via private transport if stable) | Suspected appendicitis (RLQ pain with guarding), high fever in neonate <28 days old, laceration requiring sutures, acute testicular torsion pain, dehydrating vomiting | Direct patient to nearest Emergency Department; instruct not to eat or drink (NPO) and not to drive self if dizzy or impaired |
| Level 3 (Urgent Same-Day) | See Doctor Within 4 Hours (or Today / Urgent Care) | Within 1–4 hours (or same-day clinic/urgent care) | Moderate wheezing without severe distress, acute dysuria with flank pain or fever, severe earache with fever, non-blanching rash without systemic toxicity | Book same-day acute clinic slot, route to affiliated Urgent Care center, or escalate to on-call physician if after hours |
| Level 4 (Non-Urgent / Subacute) | See Doctor Within 24 Hours / 72 Hours / Routine Office Visit | Next day to 1–2 weeks (depending on sub-tier) | Fever lasting >3 days without focal distress, mild persistent cough >10 days, uncomplicated localized skin rash, medication refill or chronic symptom check | Schedule outpatient primary care or telehealth video visit within the specified timeframe; provide interim symptom relief advice |
| Level 5 (Self-Care) | Home Care (Self-Care at Home) | No office visit required unless symptoms worsen | Uncomplicated viral upper respiratory infection (common cold), mild acute diarrhea without dehydration, minor insect bite or abrasion | Deliver structured Care Advice, weight-based OTC dosing (if applicable), and mandatory “Call Back If” red-flag instructions |
Clinical Override Rule: Schmitt-Thompson guidelines explicitly mandate that the protocol is a decision-support tool, not a substitute for registered nurse clinical judgment. A triage nurse may always upgrade (escalate) a patient to a higher acuity disposition based on vocal distress, complex comorbidities, frailty, or social barriers—and must document the clinical rationale when overriding a disposition.
How Are Schmitt-Thompson Protocols Used in Healthcare Informatics and Clinical Research?
Schmitt-Thompson Clinical Content does not sell standalone call-center software; instead, STCC licenses its structured XML/JSON protocol database into enterprise Electronic Health Records and specialized triage platforms:
- Native EHR Nurse Triage Modules (Epic, Oracle Health, MEDITECH): In Epic’s Nurse Triage / CRM module, selecting a patient’s chief complaint loads the licensed Schmitt-Thompson decision tree directly inside Hyperspace. As the nurse clicks positive or negative responses, Epic automatically constructs a time-stamped telephone encounter note, highlights the recommended disposition, and triggers single-click appointment scheduling or patient portal (MyChart) care-advice delivery.
- Cloud Triage Applications (ClearTriage, LVM Systems, Conduit Health): SaaS platforms such as ClearTriage wrap the Schmitt-Thompson protocols in a fast web interface that integrates with ambulatory EHRs (including athenaOne, eClinicalWorks, NextGen, and Epic) via HL7 SMART on FHIR launch contexts or one-click structured SOAP note copy-and-paste, and sends customized patient education handouts via SMS or email.
- Digital Self-Triage and AI Benchmark Evaluation: STCC also publishes a separate, simplified Symptom Checker content set for patient portals and mobile health apps. In clinical informatics research, the Schmitt-Thompson 5-tier disposition scale serves as the primary clinical gold standard for benchmarking the triage safety and urgency concordance of deterministic symptom checkers (such as Ada Health) and large language model (LLM) triage agents—specifically measuring under-triage rates (unsafe assignment of an emergent Level 1/2 case to Home Care) versus over-triage rates (unnecessary ED utilization).
Frequently Asked Questions
What are the Schmitt-Thompson protocols?
The Schmitt-Thompson protocols (maintained by Schmitt-Thompson Clinical Content, STCC) are a standardized library of over 750 peer-reviewed, symptom-based clinical decision trees authored by Dr. Barton Schmitt (pediatrics) and Dr. David Thompson (adult emergency medicine). They are used by registered nurses in medical call centers and outpatient clinics to assess acute patient symptoms over the telephone, determine the safest disposition urgency level, and provide standardized home-care advice.
How are Schmitt-Thompson protocols used in clinical research and healthcare?
In healthcare operations, Schmitt-Thompson protocols are embedded into EHR nurse triage modules (such as Epic) and software like ClearTriage to standardize after-hours and daytime telephone triage, reduce avoidable emergency department visits, and document defensible RN assessments. In health services and clinical AI research, they serve as the reference benchmark for evaluating telephone triage safety, nurse adherence, ED redirection rates, and the disposition accuracy of automated symptom-checking algorithms.
Can non-clinical receptionists use Schmitt-Thompson triage protocols?
No. Full Schmitt-Thompson clinical triage protocols require clinical assessment skills—such as interpreting respiratory distress, distinguishing lethargy from normal sleepiness, and evaluating complex comorbidities—and are licensed for use by registered nurses (RNs), nurse practitioners, physician assistants, and physicians. Unlicensed front-desk schedulers may only use simplified “red-flag emergency screening” checklists that immediately transfer clinical symptom calls to a licensed triage nurse or 911.
