Scoring System
An individual lung zone received 0 point for an A classification, 1 point for a B1, 2 points for a B2, and 3 points for any of the following: B3, consolidation, atelectasis, or small consolidations. Each zone received an additional point if effusion was present. The maximum score per zone was 4 points. Isolated atelectasis without other parenchymal abnormalities existing in zone 3 or 8 only received 1 point (Figure 3).
Total lung score (TLS) was the summation of all points across the 9 lung zones (possible range = 0-36). Total B-score represented the sum of only the B-line points (B1, B2, B3) (range=0-27), and total atelectasis/consolidation score was the sum of points assigned for atelectasis and consolidation classifications across zones. Total anterior score included points from zones 1, 2, 6, 7 and total posterior score from zones 3, 5, 8, 9.