Emergency Medicine：PreTest Self-Assessment and Review，Second Edition，is intended to provide medical students，as well as house officers and physicians，with a convenient tool for assessing and improving their knowledge of emergency medicine.The 500 questions in this book are similar in format and complexity to those included in Step 2 of the United States Medical Licensing Examination （USMLE）.They may also be a useful study tool for Step 3 and clerkship examinations.