Ultrasound in the ED is becoming a very important component of residency training. Basically, the ABEM (or whatever governing board) dictates that during residency training you must do something like 40 scans to graduate. In the vast majority of programs you will do many more than 40. In the ED, U/S is a huge diagnostic tool, and if you, the EM doc, know how to use the U/S machine, it will save you alot of time (instead of calling rads) and will make you some extra pocket change, as well. Here are some common situations where an EM doc uses the U/S machine almost every shift: Abdominal Aortic scan, FAST exam in Trauma, Transvaginal for ectopic, Gall bladder scan, central line placement, r/o DVT, among a few others. In addition to U/S training in residency (which varies b/w programs), you can do a 1 year fellowship in ultrasound. There aren't many, and I am not sure how competitive they are. As an incoming EM intern, I am very excited about ultrasound, and believe that down the road it should be mandatory for EM docs to be credentialed in U/S.