Granulocyte-Macrophage Colony Forming Unit

**Semantic type:** Quantitative Concept

**Definition:** A unit of viable cell concentration defined as the minimum number of hematopoietic stem cells able to produce a detectable colony of granulocyte-macrophage lineage cells.

**Synonyms:** - CFU-GM - Colony Forming Unit-Granulocyte-Macrophage - GM-CFU