Lymphoblasts 20 Percent or More of Peripheral Blood White Cells

**Semantic type:** Laboratory or Test Result

**Definition:** A semi-quantitative microscopic finding indicating that 20 percent or more of the nucleated cells in a peripheral leukocyte sample are immature mononuclear cells of lymphoid origin.

**Synonyms:** - Lymphoblasts Greater than or Equal to 20 Percent of Peripheral Blood White Cells