Age <3 months
Preterm (<34wks)
Underlying heart/lung disease
Initial SaO2 <90%
Sa02 alone should not be used as the only factor for admission
Unable to tolerate PO
Tachypnea with accessory muscle use
Sa02 alone should not be used as the only factor for admission
Bronchiolitis 
Airway obstruction
Croup
Anaphylaxis
Mediastinitis
Angioedema
Bacterial tracheitis
Aspirated foreign body