CRP and Sepsis: The optimal cut-off values of the 5 days serial measurements of CRP among proven sepsis: CRP1, CRP 2, CRP3, CRP4, and CRP5 were 2.15 mg/L, 8.01 mg/L, 6.80 mg/L, 5.25 mg/L, and 3.72 mg/L, respectively.