CBC
Retic count
VBG / ABG
Blood culture /sputum cultures
CXR
New infiltrate on CXR with at least one of the following:
Fever >38.5
Cough
Wheezing
Tachypnea
New hypoxemia
Chest pain
Note: CXR findings may lag behind the clinical features
Lung ultrasound to CXR or CT finding correlations
Consolidation seen as hyperechoic punctiform air bronchograms
Ground-glass opacities seen as coalescent B lines
Pleural effusion, defined as large if interpleural distance > 25 mm
Fever >38.5
Cough
Wheezing
Tachypnea
New hypoxemia
Chest pain
Consolidation seen as hyperechoic punctiform air bronchograms
Ground-glass opacities seen as coalescent B lines
Pleural effusion, defined as large if interpleural distance > 25 mm
Acute chest syndrome
Pneumonia
Acute coronary syndrome 
Asthma
Flail chest
Pulmonary hypertension
Fat embolism syndrome
Vaso-occlusive pain crisis