IL6 and Sepsis: Although earlier studies have reported that PCT was a more sensitive marker than existing markers such as the WBC count, CRP level, and interleukin-6 levels in adults and children in the clinical setting5, 6, 7, 8, 9, 10, the sensitivity and specificity of serum PCT in newborns were low compared to those in adults for diagnosing sepsis (respective sensitivity and specificity: 80% and 94% in adults29 and 77% and 62% in newborns30 using a cut-off value of 1 ng/mL).