Objective: To determine the serum concentration of Th-I and Th-2 cytokine in threatened preterm labor compared to that in nor¬mal pregnancy. Method: The-design was analytical cross-sectional, comparing the serum levels of TNF-a, IL-2, IL-IO, TNF-a to IL-J 0 ratio and lL-2 to IL-IO ratio between 29 subjects with threatened preterm la¬bcr and 29 normal pregnant women. The cytokine concentratio…