SERPINC1 and Sepsis: In a prospective observational study of protein C and antithrombin III levels in neonates with late onset sepsis, mean birth weight 1.86 (range 0.7-4.2) kg, gestational age 32.7 (range 25-41) weeks, age 14.5 (8–172) days, there were statistical differences in AT III (p = 0.003) and protein C activity levels (p = 0.002) between survivors and non-survivors.