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Respiratory clinical presentation

Cough: Investigations

Cough is a high-yield respiratory presentation. Learners should reason from acuity and pattern recognition to a prioritized differential, targeted investigations, and first safe management steps.

Start Free QuizReview Differential

Investigations

  • duration-focused history
  • chest x-ray if red flags/pneumonia
  • spirometry when chronic
  • TB testing when risk
  • medication review
  • pulse oximetry and work-of-breathing assessment
  • chest x-ray
  • ABG or VBG when ventilation or severity is unclear
  • CBC and infectious testing when indicated

Red Flags And Exam Traps

Red flags

  • - hemoptysis
  • - hypoxia
  • - weight loss
  • - immunocompromise
  • - respiratory distress

Common exam traps

  • - antibiotics for every cough
  • - missing ACE-inhibitor cough
  • - missing pneumonia in older adults without fever

Exam Mapping

MCCQE

  • - clinical presentation approach
  • - differential diagnosis
  • - investigation selection
  • - initial management and disposition

MCAT

  • - organ-system mechanism
  • - foundational physiology
  • - pathophysiology vocabulary
  • - data interpretation from clinical context

USMLE Step 1

  • - pathophysiology mechanisms
  • - classic and atypical findings
  • - test interpretation
  • - mechanism of therapy

USMLE Step 2 CK

  • - diagnostic next step
  • - initial management
  • - risk stratification
  • - emergency recognition

FNP

  • - primary care differential
  • - initial workup
  • - prescribing and monitoring
  • - follow-up and referral

AGPCNP

  • - adult/geriatric differential
  • - comorbidity-aware workup
  • - medication safety
  • - follow-up thresholds

PMHNP

  • - medical mimic screening
  • - mental status impact
  • - medication/substance contributors
  • - safety escalation

Respiratory Therapy

  • - oxygenation/ventilation assessment
  • - ABG/device interpretation
  • - airway escalation
  • - cardiopulmonary collaboration

Learning Assets

Cough: presentation approachBuild the first-pass problem representation and acuity screen.Cough: differential diagnosisSeparate life threats, common causes, and exam distractors.Cough: investigationsChoose tests based on pretest probability, acuity, and patient safety.Cough: management prioritiesPick the next safest action and disposition.

Flashcards

  • What is the first safety screen in cough?hemoptysis; hypoxia; weight loss
  • Name three high-yield causes of cough.viral URI; pneumonia; asthma/COPD
  • Which investigation anchors the initial cough workup?duration-focused history

Practice Questions And Cases

A learner is evaluating a patient with cough. Which finding should most strongly shift the next step toward urgent escalation?

Create a problem representation, rank the differential, choose the first investigation, and state the immediate management priority.

Image Recommendations

  • - Cough differential diagnosis flowchart
  • - Cough red-flag triage checklist
  • - Cough investigation pathway diagram
  • - Cough management-priority algorithm

Internal Links

Symptom pageDifferential pageInvestigation pageManagement pageHemoptysisWheezingStridorHypoxiaRespiratory Distress