3 Films:
Rule-out free air
Look for air-fluid levels
Width of bowel loops most visible (estimate of amount of distention)
If patient does not tolerate upright position, left lateral decubitus<unk>  film can substitute
Acute abdominal series
FAST exam
Diagnostic peritoneal lavage
Ultrasound: Abdomen
EFAST exam
Gastric lavage
Theraputic peritoneal lavage
Anoscopy