Correlations between sonographic features and laboratory characteristics of pleural effusion and serum
| Variables | Sonographic septation | P value | |
| Positive (n=70) | Negative (n=110) | ||
| Pleural effusion | |||
| LDH (IU/dL) | 1654.10±232.99 | 960.5±191.84 | 0.024 |
| Total protein (g/dL) | 4.52±0.11 | 3.81±0.11 | <0.001 |
| Glucose (mg/dL) | 72.91±10.98 | 118.95±6.53 | <0.001 |
| pH | 7.46±0.64 | 7.83±0.47 | <0.001 |
| White cell count ('×109/L) | 8.897±1.567 | 6.898±1.087 | 0.281 |
| % neutrophils | 82.23±1.52 | 75.00±1.47 | 0.001 |
| % lymphocytes | 11.21±1.32 | 13.77±1.22 | 0.171 |
| Serum | |||
| White cell count (×109/L) | 13.994±0.820 | 13.803±0.686 | 0.859 |
| CRP (mg/dL) | 16.86±1.17 | 15.75±0.99 | 0.482 |
| LDH (IU/dL) | 282.53±20.79 | 281.70±17.17 | 0.975 |
| Total protein (g/dL) | 6.32±0.11 | 6.09±0.89 | 0.114 |
| Glucose (mg/dL) | 143.16±10.30 | 142.35±5.57 | 0.940 |
| Albumin (g/dL) | 3.09±0.78 | 3.00±0.58 | 0.354 |
Values are presented as mean±SEM.
P value is derived via Student’s t-test, and p<0.05 is considered to be significant.
CRP, C reactive protein; LDH, lactate dehydrogenase.