Abdominal ultrasound in the eFAST exam is primarily focused on the detection of intra-abdominal free fluid as a marker of visceral organ injury. Further, ultrasound can be used to help guide paracentesis in the case of differentiation of hemoperitoneum from simple ascitic fluid. Herein, we describe critical elements of this examination for learners newly approaching this examination. For further reading please refer to references 1 and 2 and view the flipped classroom video in the training section of this web-page.