No widely accepted diagnostic criteria
CXR
CBC
ABG
Lactate
Blood cultures
BAL culture
Sputum aspirate culture
Pleural effusion culture
Ventilator associated pneumonia
Deterioration After Intubation 
Severe acute respiratory syndrome
ARDS
Aspiration pneumonia and pneumonitis
Pulmonary embolism
Ventilator associated lung injury
Pulmonary infarction