May not be needed in settings such as a known food bolus
PA and lateral films necessary, should include neck, chest, and abdomen
Consider obtaining lateral neck films
Coins in esophagus present their face on AP view
Coins in trachea present their face on lateral view
Bones can only be visualized <50% of time
Button batteries may present with "double-ring sign"
~60% of foreign bodies are radiopaque
CT chest
Very high-yield for both radiopaque and non-radiopaque objects
Sensitivity >99% and specificity 70-92% 
MRI
Consider for radiolucent objects to avoid radiation load of CT
Cannot use with metallic objects (if metallic, should be radiopaque on plain films)
Higher cost than CT, some EDs may not be equipped to perform at certain times, may require sedating the patient due to long image capture times
Barium Swallow is not recommended due to risk of aspiration, mediastinitis, and barrium coating mucosa (makes endoscopy more difficult)
Coins in esophagus present their face on AP view
Coins in trachea present their face on lateral view
Bones can only be visualized <50% of time
Button batteries may present with "double-ring sign"
~60% of foreign bodies are radiopaque
Very high-yield for both radiopaque and non-radiopaque objects
Sensitivity >99% and specificity 70-92% 
Consider for radiolucent objects to avoid radiation load of CT
Cannot use with metallic objects (if metallic, should be radiopaque on plain films)
Higher cost than CT, some EDs may not be equipped to perform at certain times, may require sedating the patient due to long image capture times
Ingested foreign body
Consider tracheal/lung aspiration  of foreign body
Aspirated foreign body
Oropharyngeal dysphagia
Soft tissue foreign body
CVA
Infected G-tube
Parkinson's disease