||The examples and perspective in this article deal primarily with the English-speaking world and do not represent a worldwide view of the subject. (October 2011)|
In contrast to practically every other specialty of nursing, in which a patient arrives with a diagnosis applied by a physician and the nurse must manage the patient's care according to that diagnosis, emergency nurses work with patients in whom a diagnosis has not yet been made and the cause of the problem is not known. Emergency nurses frequently contact patients in the emergency department before the patient sees a physician. In this situation, the nurse must be skilled at rapid, accurate physical examination, early recognition of life-threatening illness or injury, the use of advanced monitoring and treatment equipment, and in some cases, the ordering of testing and medication according to "advance treatment guidelines" or "standing orders" set out by the hospital's emergency physician staff. Emergency nurses most frequently are employed in hospital emergency departments, though they may also work in free-standing urgent care clinics.
Certified Emergency Nurse (CEN, USA) 
The Certified Emergency Nurse (CEN) designation is applied to a Registered Nurse who has demonstrated expertise in emergency nursing by passing a computer-administered examination given by the Board of Certification for Emergency Nursing (BCEN). The BCEN is a separate, albeit related organization to the Emergency Nurses Association (ENA), which also administers certification exams for pediatric emergency nursing (CPEN) (in coopertation with the Pediatric Nursing Certification Board (PNCB)), critical-care ground transport nursing (CTRN) and flight nursing (CFRN). The certification is valid for four years, and can be renewed either by passing another examination or by completing 100 continuing education units (CEUs) in the specialty. There is also an online "open book exam" renewal option.
As of 2012, the BCEN has designated over 26,000 active CENs in the United States and Canada.
Currently the CEN exam has 175 questions of which 150 are used for testing purposes (25 are sample questions). The passing score is 70% and the candidate has 3 hours to take the exam. The test is administered in testing centers nationwide.
Emergency Nurse Practitioner (ENP) 
In the UK 
A specialist nurse who will independently assess, diagnose, investigate, and treat a wide range of common accidents and injuries working autonomously without reference to medical staff. They primarily treat a wide range of musculoskeletal problems, skin problems and minor illness. They are trained in advanced nursing skills. Under the National Health Service grading system, ENPs are typically graded 'F' or Band 7.
In the US 
An advanced practice nurse who assesses, diagnoses, and treats a variety of common illnesses, injuries and disease processes in emergency care settings. ENPs are trained in advanced nursing and medical skills such as x-ray interpretation, ophthalmic slit lamp examination, suturing, local and regional anesthesia, abscess incision and drainage, advanced airway techniques, fracture reduction, and casting and splinting.
Emergency Care Practitioner (UK) 
A specialist nurse or specialist paramedic who works in the pre-hospital setting dealing with a wide range of medical or emergency problems. Their primary function is to assess, diagnose and treat a patient in the home in an emergency setting.
This is a new profession that has developed as a result of political changes in the United Kingdom which has resulted in doctors (general practitioners) opting out of "out of hours" medical care in many areas. This role is now being fulfilled by ECP's in many[specify] areas.
Additional Emergency Nursing Training and Qualifications 
- ATNC - Advanced Trauma Nursing Course
- ACLS - Advanced Cardiac Life Support
- ATLS - Advanced Trauma Life Support
- ENPC - Emergency Nursing Pediatric Course
- MICN - Mobile Intensive Care Nurse
- PALS - Pediatric Advanced Life Support
- PHEC - Pre-Hospital Emergency Care
- TNCC - Trauma Nursing Core Course
- Emergency Nurses Association - Scope of Emergency Nursing Practice
- RCS Edinburgh - Faculty of Pre-Hospital Care
- Emergency Nurse
- impactednurse.com - An Emergency Nursing Blog
- Emergency Nurses Association
- Board of Certification of Emergency Nursing
- "CEN Frequently Asked Questions". Board of Certification of Emergency Nursing. Retrieved 9 May 2012.