FCGR1A and Sepsis: We didnot find any statistically significant differences for CD64 and CD163 indexes,and CD64 and CD163 MFIs for neutrophils or monocytes, between gram-positive andgram-negative sepsis (P > .05 for all comparisons, data not shown).Optimum diagnostic cutoff levels, AUCs, sensitivity and specificity of CD64 andCD163 indexes, CD64 and CD163 MFIs for neutrophils and monocytes, and CD64score points, for SIRS with sepsis at the time of suspected sepsis and 24 hourslater are presented in Table 3.