FCGR1A and Sepsis: A study assessing the diagnostic accuracy of the neutrophil CD64, PCT, and IL-6 for sepsis found that CD64 exhibited a sensitivity of 0.88 (95% CI, 0.81–0.92), a specificity of 0.88 (95% CI, 0.83–0.91), and an AUC of 0.94 (95% CI, 0.91–0.96) [69].