The FAST (Focused Assessment with Sonography in Trauma) examination looks for the presence of fluid—presumed to be blood in the appropriate clinical setting—visualizing 10 structures or spaces in four areas: Pericardial Perihepatic Perisplenic Pelvic The E-FAST (Extended-FAST) additionally surveys the anterior and lateral pleural spaces (thoracic view) to evaluate for a pneumothorax or pleural effusion, assumed to be a hemothorax in trauma patients.