What is the abbreviation for Emergency Room?

The abbreviation for Emergency Room is "ER." This term is widely recognized in both medical settings and among the general public, serving as a shorthand reference to the area of a hospital where urgent medical care is provided. The term is commonly used in emergency medicine and healthcare discussions, making it easily identifiable and understood by both healthcare professionals and patients alike.

Other options serve different meanings in medical terminology. For example, "EMR" refers specifically to Electronic Medical Records, which are digital versions of patients' paper charts. "ED" stands for Emergency Department, which is often used synonymously with Emergency Room, but it is more formal and reflects the broader scope of emergency services beyond just patient intake. Lastly, "ISR" does not have a widely recognized association with emergency services in this context. Thus, "ER" remains the most familiar and commonly used abbreviation for an Emergency Room.