Pneumonia diagnostic algorithm

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Alejandro Lemor, M.D. [2]

Pneumonia Microchapters
Home
Patient Information
Overview
Historical Perspective
Classification
Pathophysiology
Causes
Differentiating Pneumonia from other Diseases
Epidemiology and Demographics
Risk Factors
Screening
Natural History, Complications and Prognosis
Diagnosis
Diagnostic Criteria
Diagnostic Algorithm
History and Symptoms
Physical Examination
Laboratory Findings
Chest X Ray
CT
Other Imaging Findings
Treatment
Medical Therapy
Prevention
Cost-Effectiveness of Therapy
Future or Investigational Therapies
Case Studies
Case #1
Pneumonia diagnostic algorithm On the Web
Most recent articles
Most cited articles
Review articles
CME Programs
Powerpoint slides
Images
American Roentgen Ray Society Images of Pneumonia diagnostic algorithm All Images X-rays Echo & Ultrasound CT Images MRI
Ongoing Trials at Clinical Trials.gov
US National Guidelines Clearinghouse
NICE Guidance
FDA on Pneumonia diagnostic algorithm
CDC onPneumonia diagnostic algorithm
Pneumonia diagnostic algorithm in the news
Blogs on Pneumonia diagnostic algorithm
Directions to Hospitals Treating Pneumonia
Risk calculators and risk factors for Pneumonia diagnostic algorithm

Diagnostic Algorithm

Shown below is an algorithm for the diagnostic approach of pneumonia.
Abbreviations: HCAP: Healthcare-associated pneumonia; CAP: Community-acquired pneumonia

Respiratory Tract Infection Symptoms: ❑ Fever ❑ Cough with sputum ❑ Dyspnea ❑ Pleuritic chest pain

Physical Examination: ❑ Fever ❑ Tachypnea ❑ Tachycardia ❑ Dull percussion on affected side ❑ Bronchial breath sounds ❑ Rales and/or ❑ Increased vocal fremitus ❑ Pleural friction rub

Order Labs: ❑ Complete blood count (CBC) ❑ Blood urea nitrogen (BUN) ❑ Sputum gram stain ❑ Sputum culture ❑ Blood culture if necessary ❑ If suspecting atypical pneumonia obtain: ❑ Urine legionella antigen ❑ Enyzme Immunoassay (EIA) ❑ Immunofluorescence ❑ Polymerase chain reaction (PCR) for atypical and viral including influenza

❑ Order a chest X-ray if the patient presents with any of the following: Fever (>37.8° C / 100° F) Tachypnea (> 20 breaths/min) Tachycardia (> 100 bpm) Decreased breath sounds and crackles in the physical exam

Does the patient meets any of the following criteria for HCAP? Hospitalized in an acute care hospital for 2 or more days within 90 days of the infection; Resided in a nursing home or long-term care facility; Received recent intravenous antibiotic therapy, chemotherapy, or wound care within the past 30 days of the current infection; Attended a hospital or hemodialysis clinic

YES

NO The patient has CAP

Does the infection occurred ≥48 hours after admission and it was not present at admission?

Does the patient meets any of the Severity Criteria? Minor Criteria Respiratory rate >30 breaths/min PaO2/FiO2 ratio <250 Multilobar infiltrates Confusion/disorientation Uremia (BUN level, >20 mg/dL) Leukopenia (WBC count, <4000 cells/mm3) Thrombocytopenia (platelet count, < 100,000 cells/mm3) Hypothermia (core temperature, <36 degrees C) Hypotension requiring aggressive fluid resuscitation Major criteria Invasive mechanical ventilation Septic shock with the need for vasopressors

YES Admit the patient

NO Outpatient antibiotic regimen