Can combined blood neutrophil to lymphocyte ratio and C-reactive protein be used for diagnosis of spontaneous bacterial peritonitis?

AbstractBackground and objective: Spontaneous bacterial peritonitis (SBP) is diagnosed by the presence of ≥250 polymorphonuclear neutrophils (PMN)/mm3 in the ascites and the absence of surgically treatable cause of intra-abdominal infection. Blood neutrophil lymphocytic ratio (NLR) is an inexpensive and simple test for inflammation. C-reactive protein (CRP) is an inflammatory marker used for the diagnosis and follow-up of many diseases and morbidities. We aimed to evaluate the clinical utility of combined blood NLR and CRP as a non-invasive test for SBP diagnosis.Methods: Blood NLR was calculated, and CRP value determined in 180 cirrhotic patients with ascites (126 with and 54 without SBP). Sensitivity and specificity of combined blood NLR and CRP values for SBP diagnosis were estimated by receiver operator characteristic curve.Results: Both blood NLR and CRP values were significantly higher in SBP (p  2.89 had a sensitivity 80.3% and specificity 88.9%. CRP >11....