CEACAM1 and Sepsis: Soluble CEACAM1 levels were persistently elevated at day 7-8 (50.2 ng/mL ± 12.9; P < 0.05), but had returned to normal values in convalescent serum samples drawn 3 months after sepsis onset (15.7 ng/mL ± 12.3; see Figure 1B).