Table 1. Scoring system for lung injury and macrophage abundance.
| Epithelial Injury | |
|---|---|
| 0 | Normal intact epithelium |
| 1 | Rare cells have separated from epithelium |
| 2 | 10-25% of epithelial cells have separated from underlying basement membrane |
| 3 | 25-50% of epithelium has separated |
| 4 | 51-75% of epithelium has separated |
| 5 | >75% of epithelial cells have separated |
| Hemorrhage | |
| 0 | No red blood cells (RBC) outside of blood vessels |
| 1 | Few interstitial RBC |
| 2 | Few RBC in some alveoli |
| 3 | Moderate number of RBC in some alveoli |
| 4 | Many RBC in most alveoli |
| 5 | Large numbers of RBC in all alveoli |
| Macrophage abundance | |
| 0 | None-Rare |
| 1 | 1-10% of alveoli/saccules contain macrophages |
| 2 | 10-25% |
| 3 | 25-75% |
| 4 | >75% |