Minimum Alveolar Concentration 50 Percent

**Semantic type:** Quantitative Concept

**Definition:** A unit of potency for inhalational gases, defined as the concentration of gas in the lung required to immobilize 50% of individuals in response to a stimulus, such as pain.

**Synonyms:** - MAC50 - Minimum Alveolar Concentration 50% - {MAC50} - {MAC50}