AF C3 level

AF PMNLs count (mm³)

AF fluid culture

Serum LBP

Variables

82%

97.14%

33.33%

53.3%

Sensitivity

84%

98.00%

92.31%

57.7%

Specificity

83.7%

40.96%

71.43%

42.3%

PPV

82.4%

50.00%

70.95%

46.7%

NPV

<0.001

<0.001

<0.05

>0.05

p Value