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Smith scores of the extent of pathological lesions.
| Score | Alveolar hemorrhage | Extent of fibrin | Alveolar infiltration/field |
|---|---|---|---|
| 0 | No hemorrhage | No fibrin in alveolar | <5 cells |
| 1 | >5 erythrocytes per alveolus in 1–5 alveoli | Fibrin occupation <1/3 of field | 5–10 cells |
| 2 | >5 erythrocytes per alveolus in 5–10 alveoli | Fibrin occupation <2/3 but >1/3 of field | 10–20 cells |
| 3 | >5 erythrocytes per alveolus in >10 alveoli | Fibrin occupation >2/3 of field | >20 cells |
