Apgar score is a system for evaluating the physical condition of a baby immediately after birth. An Apgar score is given to most babies born in the United States and to newborns in many other parts of the world. The score measures five vital functions: (1) appearance (skin color), (2) pulse (heart rate), (3) grimace (reflex response), (4) activity (muscle tone), and (5) respiration. The first letters of these functions form the word Apgar. The Apgar score is obtained at one minute and, in most cases, at five minutes after birth.