USMLE Prep - Medical Reference Library

FAST Exam - Focused Assessment with Sonography in Trauma

System: Procedures • Reviewed: Aug 31, 2025 • Step 1Step 2Step 3

Synopsis:

Rapid ultrasound to detect free fluid in peritoneum and pericardium; integrates into trauma algorithm.

Key Points

  • Stabilize ABCs; begin targeted evaluation without delaying life-saving therapy.
  • Use system-specific risk tools to guide testing and disposition.
  • Order high-yield tests first; escalate imaging when indicated.
  • Start evidence-based initial therapy and reassess frequently.

Algorithm

  1. Primary survey and vitals; IV access and monitors.
  2. Focused history/physical; identify red flags and likely etiologies.
  3. Order system-appropriate labs and imaging (see Investigations).
  4. Initiate guideline-based empiric therapy (see Pharmacology).
  5. Reassess response; arrange consultation and definitive management.

Clinical Synopsis & Reasoning

For Fast Exam Trauma Ultrasound, frame the differential by acuity and pathophysiology, then align diagnostics to the leading hypotheses. Prioritize stabilization while obtaining high‑yield studies such as CBC (Baseline hematology), BMP (Electrolytes/renal). Incorporate bedside imaging and targeted labs to define severity and identify complications; synthesize results with clinical trajectory to refine the working diagnosis and disposition needs.


Treatment Strategy & Disposition

Initiate disease‑directed therapy alongside supportive care, titrating to objective response. Pharmacologic options commonly include Analgesia/Antipyretics. Use validated frameworks (e.g., Common Pitfalls) to guide escalation and site of care. Address precipitating factors, de‑escalate empiric therapies with data, and arrange follow‑up for monitoring and risk‑factor modification; admit patients with instability, high risk of deterioration, or needs for close monitoring.


Epidemiology / Risk Factors

  • Risk factors vary by condition and patient profile

Investigations

TestRole / RationaleTypical FindingsNotes
CBCBaseline hematologyAbnormal counts
BMPElectrolytes/renalDerangements

Common Pitfalls

PitfallAvoidance
Gastric or bowel shadow misreadSweep and optimize windows
Shallow depth misses dependent fluidIncrease depth
Obesity or subcutaneous airUse lower frequency, adjust position

Pharmacology

MedicationMechanismOnsetRole in TherapyLimitations
Lorazepam (pre-procedure)GABA-A agonismHoursClaustrophobia/anxiety during ultrasoundSedation
Prednisone + diphenhydramine (premed)Steroid + H1 blockerHoursOnly for prior contrast reactionHyperglycemia/sedation

Prognosis / Complications

  • Prognosis depends on severity, comorbidities, and timeliness of care

Patient Education / Counseling

  • Explain red flags and when to seek emergent care.
  • Reinforce medication adherence and follow-up plan.

Notes

EFAST adds lung views for pneumothorax/hemothorax; correlate with vitals and exam.


References

  1. ATLS and FAST Integration — Link
  2. ACEP Ultrasound Section — Link