From:  C-reactive protein, procalcitonin, and neutrophil-to-lymphocyte ratio as mortality predictors in elderly women with pneumonia

 Diagnostic performance of inflammatory biomarkers for predicting mortality outcome.

BiomarkerCut-off valueSensitivitySpecificityAUC
NLR1.7291.2%14.9%0.495 (95% CI 0.394–0.596)
CRP14.50 mg/L91.2%26.8%0.543 (95% CI 0.449–0.636)
PCT0.115 ng/mL91.2%16.7%0.466 (95% CI 0.367–0.564)

Diagnostic accuracy of NLR, CRP, and PCT in predicting mortality outcomes. All three biomarkers demonstrated high sensitivity (91.2%), but low to moderate specificity. CRP showed the highest AUC, indicating slightly better discriminative performance compared to NLR and PCT. AUC: area under the curve; CRP: C-reactive protein; NLR: neutrophil-to-lymphocyte ratio; PCT: procalcitonin.