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Description of histology grades
| Grade | Description |
|---|---|
| 0 | No damage on all histology levels |
| 1 | Very minor damage - 1 to a few very small clusters of red blood cells on at least 1 histology level |
| 2 | Moderate (more significant) damage - 1 larger cluster of red blood cells or a greater number of small clusters of red blood cells on at least 1 histology level |
| 3 | Extensive damage - A large number of clusters of red blood cell extravasation, with or without pooling on at least 1 histology level. |
