INTRODUCTION Over the past two decades, the application of ultrasound by physicians in the emergency department has become common practice. The adoption of ultrasound skills by emergency physicians resulted from the unique practice environment of emergency medicine, which requires the ability to make timely diagnoses of life-threatening conditions at all hours of the day.1 Ultrasonography is uniquely suited to emergency medicine application. When performed at the patient’s bedside by the treating physician it can provide real-time diagnostic information in many time-sensitive, life-threatening conditions without the delay associated with waiting for an ultrasound technician, who is often not available in the hospital during off hours. Using ultrasound also eliminates the risk associated with requiring potentially unstable patients to leave the emergency department to have tests performed. This need has been recognized by the American College of Emergency Physicians (ACEP). In 1991, the ACEP Board of Directors approved a position statement that for the first time formally supported the use of ultrasound technology by emergency physicians.2 The Society for Academic Emergency Medicine (SAEM) endorsed the ACEP position and published a model curriculum in 1994.3 In 1997 ACEP created a more comprehensive statement, which was updated in 2001. Along with defining specific types of examinations that are considered to be within the domain of the emergency physician, it stated that: “Training in performing and interpreting ultrasound imaging studies should be included in emergency medicine residency curricula.”4 In 1999, the American Medical Association (AMA) Resolution 802 stated that ultrasound use was within the scope of practice of appropriately trained physicians and that credentialing criteria should be developed by each specialty.5 In 2001, ACEP published Marc L. Daymude, MD, FACEP, is medical director and Leonard Gruppo, PA-C, is program director of the Emergency Medicine Physician Assistant Residency at San Antonio Uniformed Services Health Education Consortium; Sumeru Mehta, MD, is director of the Emergency Medicine Ultrasound Program at San Antonio Uniformed Services Health Education Consortium, Department of Emergency Medicine, Brooke Army Medical Center, Fort Sam Houston, Texas.