MDS flow scores adapted from the definition of the flow cytometric scoring system by Wells et al12
| Score . | Definition . |
|---|---|
| 0 | No flow cytometric aberrancies in either subpopulation analyzed |
| 1 | A single aberrancy in either granulocytes or monocytes |
| 2 | A single aberrancy in both granulocytes and monocytes or 2 or 3 aberrancies in either granulocytes and monocytes or expression of CD34 or lineage infidelity markers on either granulocytes or monocytes |
| 3 | 4 or more aberrancies in either granulocytes and monocytes |
| 4 | 2 or 3 aberrancies in both granulocytes and monocytes |
| 1 additional point | Decreased myeloid-lymphoid ratio (< 1), normal percentage of myeloid blasts (< 5%) with flow cytometric aberrancies |
| 2 additional points | Increased percentage of abnormal myeloid blasts (5%-10%) |
| 3 additional points | Increased percentage of abnormal myeloid blasts (11%-20%) |
| 4 additional points | Increased percentage of abnormal myeloid blasts (> 20%) |
| Score . | Definition . |
|---|---|
| 0 | No flow cytometric aberrancies in either subpopulation analyzed |
| 1 | A single aberrancy in either granulocytes or monocytes |
| 2 | A single aberrancy in both granulocytes and monocytes or 2 or 3 aberrancies in either granulocytes and monocytes or expression of CD34 or lineage infidelity markers on either granulocytes or monocytes |
| 3 | 4 or more aberrancies in either granulocytes and monocytes |
| 4 | 2 or 3 aberrancies in both granulocytes and monocytes |
| 1 additional point | Decreased myeloid-lymphoid ratio (< 1), normal percentage of myeloid blasts (< 5%) with flow cytometric aberrancies |
| 2 additional points | Increased percentage of abnormal myeloid blasts (5%-10%) |
| 3 additional points | Increased percentage of abnormal myeloid blasts (11%-20%) |
| 4 additional points | Increased percentage of abnormal myeloid blasts (> 20%) |