Table 1: Biological Markers Measured in Pleural Fluid, According to Pleural Fluid/Serum Ratio Value

Pleural Fluid/Serum Ratio
Molecule MWa Molecular Radiusb Pleural Fluid Mean (SDc) Serum Mean (SDc) Mean (SD) Minimum Value Maximum Value
ADA 42 29.10 8.52 (3.26) 22.75 (8.37) 0.40 (0.17) 0.13 0.82
CRP 115 42.88 0.84 (0.76) 2.22 (1.61) 0.50 (0.63) 0.05 3.50
LDH 134 45.48 122 (62) 232 (88) 0.60 (0.48) 0.22 2.71
CEA 180 50.95 1.05 (0,69) 2.20 (1.56) 0.60 (0.51) 0.15 2.47
CuZnSOD 31 26.08 98.38 (50) 210 (139) 0.64 (0.37) 0.07 1.55
MMP-8 85 38.61 14.76 (5.2) 42.06 (12) 0.80 (2.87) 0.00 12.82
MMP-9 92 39.35 33.19 (15) 598 (226) 0.09 (0.26) 0.00 1.24
MMP-7 28 24.89 1.61 (2.29) 7.11 (2.78) 0.22 (0.24) 0.03 1.31
TNF-α 17 20.72 18.78 (11.78) 20.74 (14.21) 1.04 (0.57) 0.40 2.63
MMP-3 57 32.73 28 (16) 25.41 (19.77) 1.40 (0.86) 0.27 3.53
MMP-2 72 35.81 422.2 (122.2) 232.4 (68.21) 1.89 (0.46) 0.97 3.19
IL-6 20 21.99 43.82 (42.66) 29.27 (38.54) 29.27 (38.54) 5.09 208.60

a molecular weight in kDa,
b molecular radius in Å,
c standard deviation. The mean value in pleural fluid and serum is given in ng/ml for MMPs, CuZnSOD, CEA, IU/L for ADA and LDH, mg/dl for CRP and pg/ml for IL-6 and TNF-α.