Skip to content

NREMT Master Differentiator Table

Category: Concepts Sources: UCLA EMT Ultimate Study Guide (2026) Last updated: 2026-05-06

Overview

The 25 most commonly tested "conditions that look alike but have one key distinguishing feature." Each row names two conditions, their characteristic presentations, and — most importantly — THE TELL: the single clinical feature that distinguishes them on NREMT scenario questions.

How to use this table: When a scenario presents two conditions with overlapping symptoms, focus on THE TELL column. NREMT questions are written specifically to test whether you know the one differentiating feature. Everything else may look the same.

The 25 Master Comparisons

Cardiovascular

Compare Condition A Condition B THE TELL
Stable Angina vs MI Stable Angina: exertional, predictable, relieved with nitro/rest Unstable Angina / MI: at REST, NOT relieved, new or worsening At rest + doesn't respond = unstable → treat as MI
AMI vs Aortic Dissection AMI: gradual onset, pressure/tightness, waxes and wanes Aortic Dissection: INSTANT tearing, maximal from onset, BP arm discrepancy Tearing quality + maximal immediately + unequal arm BP = dissection. Do NOT give nitro.
CHF vs Pneumonia vs PE CHF: BILATERAL crackles + orthopnea Pneumonia: LOCALIZED crackles + fever + productive cough PE: CLEAR lung sounds + sudden dyspnea
Obstructive: PE vs Tamponade PE: sudden dyspnea + CLEAR lung sounds Tamponade: Beck's Triad (JVD + muffled heart sounds + ↓ BP) Lung sounds + pulse equality + Beck's Triad presence differentiates all three
Tension PTX vs Tamponade Tension PTX: JVD + hypotension + ABSENT breath sounds + tracheal deviation Tamponade: JVD + hypotension + MUFFLED heart sounds (breath sounds normal) Lung sounds: ABSENT = Tension PTX | Muffled heart tones = Tamponade
Tension PTX vs Hemothorax Tension PTX: JVD (fluid/air backing up) Hemothorax: FLAT neck veins (blood volume lost from system) Neck vein status: distended = obstructive shock | flat = volume loss
Cardiogenic vs Hypovolemic Shock Cardiogenic: JVD + bilateral crackles + semi-upright position Hypovolemic: FLAT veins + no crackles + supine position JVD status + lung sounds + position of treatment

Respiratory

Compare Condition A Condition B THE TELL
Croup vs Epiglottitis Croup: gradual, barky cough, low fever, no drooling Epiglottitis: SUDDEN, HIGH fever, DROOLING, tripod, don't examine throat Drooling + high fever + sudden onset = epiglottitis. DO NOT touch the throat.
Asthma vs COPD Asthma: reversible, trigger-based, younger patient COPD: chronic, progressive, older, smoking history O₂ target differs: Asthma = 94–100% | COPD = 88–92%
COPD: Wheeze vs Silent Chest Wheeze: seems like improvement CRITICAL — no airflow, not improvement Silent chest in asthmatic = BVM situation. Wheeze disappeared because there's NO air moving.
Resp Distress vs Failure Distress: ALERT, tachypnea → give O₂ Failure: ALTERED mental status or cyanosis → BVM immediately Mental status drives the treatment decision, not the rate alone.

Shock

Compare Condition A Condition B THE TELL
Hypovolemic vs Neurogenic Shock Hypovolemic: TACHYCARDIA + cool/clammy skin Neurogenic: BRADYCARDIA + WARM/PINK/DRY skin + paralysis Opposite presentations — warm skin + bradycardia + paralysis = neurogenic

Neurologic / Endocrine

Compare Condition A Condition B THE TELL
Stroke vs Hypoglycemia Stroke: fixed neuro deficits, normal BGL Hypoglycemia: AMS/weakness, BGL <60 — focal deficits possible Always check BGL first. Hypoglycemia can perfectly mimic stroke. Treat glucose first.
Ischemic vs Hemorrhagic Stroke Ischemic (87%): tPA eligible, aspirin OK Hemorrhagic: NO tPA, NO aspirin — can be lethal Cannot distinguish in field — CT needed. Never give aspirin to any stroke patient.
Hypoglycemia vs Hyperglycemia Hypoglycemia: RAPID onset, cool/clammy, agitation Hyperglycemia/DKA: GRADUAL, warm/dry, fruity breath (DKA) Skin temperature/moisture + onset speed + breath smell
DKA vs HHNS DKA: fruity breath, BGL 250–500, Type 1, hours HHNS: NO fruity breath, BGL >600, Type 2, days — deep coma Fruity breath = DKA. No fruity breath + BGL >600 + deep coma = HHNS
Epidural vs Subdural Bleed Epidural: ARTERIAL, rapid, LUCID INTERVAL → rapid deterioration Subdural: VENOUS, delayed hours/days, gradual confusion in elderly Lucid interval = epidural ('talks and dies'). Gradual in elderly = subdural.
Delirium vs Dementia Delirium: ACUTE onset, fluctuating, REVERSIBLE Dementia: GRADUAL onset, progressive, IRREVERSIBLE Timing: family says 'today' = delirium (emergency). 'Always like this' = dementia (baseline).
Syncope vs Seizure Syncope: brief LOC, IMMEDIATE full recovery when supine, NO postictal state Seizure: tonic-clonic + POSTICTAL confusion (5–30 min) Postictal state is the definitive differentiator

Toxicology

Compare Condition A Condition B THE TELL
Opioid vs Sedative-Hypnotic Opioid: PINPOINT pupils + responds to Narcan Sedative-hypnotic: NORMAL pupils + no EMT reversal agent Pupil size + Narcan response
Cholinergic vs Anticholinergic Cholinergic: WET — all secretions, MIOSIS (pinpoint) Anticholinergic: DRY — flushed hot skin, MYDRIASIS (dilated) Wet vs. Dry is the entire differentiator. Opposite toxidromes.

OB / Trauma

Compare Condition A Condition B THE TELL
Placenta Previa vs Abruption Previa: PAINLESS + significant bright red bleeding Abruption: SEVERE PAIN + rigid uterus + minimal external bleeding Pain is the differentiator. NEVER perform vaginal exam in either.
Preeclampsia vs Eclampsia Preeclampsia: HTN + end-organ symptoms, NO seizure Eclampsia: Preeclampsia + SEIZURE The seizure is the transition point between pre- and eclampsia

Environmental

Compare Condition A Condition B THE TELL
Heat Exhaustion vs Heat Stroke Heat exhaustion: NORMAL mental status Heat stroke: ALTERED mental status — hallmark AMS marks the transition to stroke. Any AMS = heat stroke = aggressive cooling NOW.
DCS vs Air Embolism DCS: DELAYED — hours after surfacing Air embolism: IMMEDIATE — at surface during ascent Timing is everything: delayed = DCS | immediate = air embolism. Both = 100% O₂ + hyperbaric.

Additional High-Yield Differentiators (From Chapters 20–26)

Contamination vs Exposure (Ch 21)

KEY DIFFERENTIATOR: Contamination = substance is ON the provider (skin, clothing) — it is cleanable, and is NOT yet an exposure. Exposure = potential for infection (mucous membrane contact, needlestick, airborne inhalation). PPE prevents contamination from becoming exposure. This distinction drives post-incident reporting decisions.

Influenza vs Common Cold (Ch 21)

Influenza Common Cold
Onset Sudden Gradual
Fever Yes — prominent Mild or absent
Myalgias Severe Minimal
Systemic symptoms Marked — "hit by a truck" Minimal
Runny nose Minimal Prominent

Pediatric Assessment Triangle — PAT (Ch 26)

The PAT is a 30-second from-the-doorway assessment — completed before touching the patient.

Side Components Abnormal Finding
Appearance TICLS: Tone, Interactiveness, Consolability, Look/Gaze, Speech/Cry Limp, unresponsive, inconsolable, poor eye contact, weak cry
Work of Breathing Abnormal sounds (stridor, grunting, wheezing) | Retractions | Nasal flaring | Head bobbing | Seesaw respirations Grunting = auto-PEEP (respiratory failure) | Stridor = upper airway obstruction
Circulation to Skin Pallor | Mottling | Cyanosis | Capillary refill >2 seconds Mottling = circulatory failure

KEY DIFFERENTIATOR — PAT: Any two sides abnormal = immediate intervention. Grunting = child is trying to keep alveoli open = respiratory failure, not distress. Abnormal appearance alone = sick child. The PAT is completed BEFORE touching — it is a visual/auditory assessment only.

TICLS mnemonic (Appearance side): Tone · Interactiveness · Consolability · Look/Gaze · Speech/Cry

Pediatric Anatomical Differences Affecting Care (Ch 26)

  • Larger occiput: causes neck flexion when supine — place pad under shoulders (not head) to maintain neutral airway
  • Larger tongue: most common cause of airway obstruction in children
  • Obligate nose breathers (infants): nasal congestion alone can cause respiratory distress
  • Cartilaginous ribs: internal organ injury without rib fracture — a child CAN have pulmonary contusion with no broken ribs
  • Growth plates: weaker than ligaments — suspect fracture before sprain in pediatric extremity injury
  • Fontanelles: present until ~18 months — bulging = increased ICP; sunken = dehydration

Neurogenic Shock vs. Other Shock (Ch 25)

KEY DIFFERENTIATOR: Most shock = cold, pale, tachycardia. Neurogenic shock = warm, pink skin BELOW the injury + hypotension + bradycardia (loss of sympathetic tone). Warm + brady + paralysis = neurogenic. This is heavily tested.

SMR — When to Apply (Ch 25)

Apply SMR to blunt force trauma patients with ANY of: 1. Midline neck or back pain or deformity 2. Numbness or weakness in any extremity 3. Altered level of consciousness 4. Distracting injuries that impair reliable examination

NREMT TIP — SMR: SMR is NOT indicated for penetrating trauma to head/neck/torso WITHOUT neurological signs. Selective SMR: if patient is alert, has no spinal pain, no neuro deficits, no distracting injury, and no intoxication — spine may be cleared clinically. SMR is a TREATMENT, not an assessment step — do not let it delay ABCs.

Quick-Reference Mnemonics

Mnemonic Stands For Use
TICLS Tone, Interactiveness, Consolability, Look/Gaze, Speech/Cry PAT Appearance assessment
DOPE Displacement, Obstruction, Pneumothorax, Equipment failure Sudden deterioration in trach or intubated patient
DABDA Denial, Anger, Bargaining, Depression, Acceptance Kübler-Ross stages of grief
AEIOU-TIPS Alcohol, Epilepsy, Insulin, Opioids, Uremia / Trauma, Infection, Psychiatric, Stroke Causes of altered mental status
SLUDGEM Salivation, Lacrimation, Urination, Defecation, GI distress, Emesis, Miosis Cholinergic toxidrome (organophosphate/nerve agent)
6 Ps Pain, Pallor, Pulselessness, Paresthesia, Paralysis, Pressure Compartment syndrome

Sources

  • UCLA EMT Ultimate Study Guide (2026) — Master NREMT Differentiator Table (Ch 26 / Final Section)