Table 1 Acute lung injury pathology scoring criteria
Score | Alveolar septa | Alveolar haemorrhage | Intra-alveolar fibrin | Intra-alveolar infiltrations per field |
|---|---|---|---|---|
0 | All are thin and delicate | No haemorrhage | No intra-alveolar fibrin | Less than 5 intra-alveolar cells |
1 | Congested alveolar septa in less than 1/3 of the field | Erythrocytes per alveolus in 1 to 5 alveoli | Fibrin strands in less than 1/3 of the field | 5 to 10 intra-alveolar cells |
2 | Congested alveolar septa in 1/3 to 2/3 of the field | At least 5 erythrocytes per alveolus in 5 to 10 alveoli | Fibrin strands in 1/3 to 2/3 of the field | 10 to 20 intra-alveolar cells |
3 | Congested alveolar septa in greater than 2/3 of the field | At least 5 erythrocytes per alveolus in more than 10 alveoli | Fibrin strands in greater than 2/3 of the field | More than 20 intra-alveolar cells |