Total calprotectin demonstrated a higher diagnostic accuracy for distinguishing sepsis from non-sepsis patients (AUC 0.67) compared to its subunits S100A8 (AUC 0.59) and S100A9 (AUC 0.52).
Observational (n=271)
Does total calprotectin perform better than its subunits S100A8 and S100A9 in distinguishing sepsis and predicting 30-day mortality in critically ill ICU patients?
Total calprotectin is superior to its individual subunits for identifying sepsis in ICU patients, but weak correlations between the markers highlight challenges in assay harmonization.
Effect estimate: AUC 0.67
Calprotectin is a 24 kD heterodimer of calcium-binding proteins S100A8 and S100A9. At present, there is a lack of knowledge about the specificity of various methods for calprotectin detection, whether they measure only dimers between S100A8 and S100A9, S100A8-S100A8 dimers, S100A9/S100A9 dimers, or free subunits. This study aimed to compare total calprotectin levels with those of its subunits, S100A8 and S100A9, in ICU patients. This prospective observational study includes 271 sepsis and non-sepsis patients. Inclusion criteria were admission to intensive care and the presence or need for an arterial catheter. Plasma total calprotectin was measured at ICU admission and the following two days by particle-enhanced turbidimetric (PETIA) calprotectin reagents from Gentian AS and a Mindray BS380 chemistry analyzer. S100A8 and S100A9 were analyzed by commercial sandwich ELISA DY4570-05, and DY5578, R&D Systems, respectively. Sepsis was defined according to Sepsis-3 as suspected infection and a Sequential organ failure assessment (SOFA) >2 on admission. Receiver operating characteristic (ROC) analysis showed that total calprotectin had a larger area under the curve (AUC) for distinguishing sepsis from non-sepsis patients (0.67) compared to S100A8 (0.59) and S100A9 (0.52). For predicting 30-day mortality, S100A9 had a higher AUC value (0.64) than S100A8 (0.59). However, weak correlations between total calprotectin and its subunits suggest no significant predictive relationship for 30-day mortality, while also highlighting potential assay harmonization challenges across manufacturers.
Sejersen et al. (Mon,) conducted a observational in Critically ill patients (ICU admission) (n=271). Total calprotectin vs. S100A8 and S100A9 subunits was evaluated on Distinguishing sepsis from non-sepsis patients (AUC) (AUC 0.67). Total calprotectin demonstrated a higher diagnostic accuracy for distinguishing sepsis from non-sepsis patients (AUC 0.67) compared to its subunits S100A8 (AUC 0.59) and S100A9 (AUC 0.52).