Combined serum biomarkers in the noninvasive diagnosis of complicated parapneumonic effusions and empyema

BMC Pulmonary Medicine

Table 5 Spearman correlation between the pleural fluid and serum levels of the four proteins in PPE patients

Parameters	PE NGAL	PE Calprotectin	PE BPI	PE AZU1	Serum NGAL	Serum Calprotectin	Serum BPI	Serum AZU1
PE NGAL	―	0.594**	0.625^**	0.708^**	0.420^**	0.307^**	0.054	0.283^*
PE calprotectin	―	―	0.744^**	0.626^**	0.374^**	0.433^**	0.058	0.009
PE BPI	―	―	―	0.601^**	0.429^**	0.357^**	0.168	0.085
PE AZU1	―	―	―	―	0.222	0.195	−0.098	0.234^*
Serum NGAL	―	―	―	―	―	0.373^**	0.338^**	0.264^*
Serum calprotectin	―	―	―	―	―	―	0.327^**	0.321^**
Serum BPI	―	―	―	―	―	―	―	0.155
Serum AZU1	―	―	―	―	―	―	―	―

ISSN: 1471-2466