Venn Diagram - Does this patient have pneumonia?
Diagnosis is generally based on three lines of evidence:

 
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Imaging evidence of a chest infiltrate (e.g., CXR, CT, ultrasound)
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Inflammation (e.g., fever/hypothermia, rigors, night sweats, leukocytosis, left-shift, procalcitonin)
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Pulmonary symptoms (e.g., dyspnea, cough, sputum production, pleuritic chest pain) and signs (tachypnea, hypoxemia).


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