The neutrophil-to-lymphocyte ratio: A low-cost antenatal indicator of placental chorioamnionitis in women who deliver preterm without clinical signs and symptoms of infection.

Unlabelled: Chorioamnionitis is present in up to 70% of spontaneous preterm births and is associated with poor maternal, fetal and neonatal outcomes.

Objective: To explore the relationship between the neutrophil-to-lymphocyte ratio and histological chorioamnionitis in women who delivered preterm with no clinical signs or symptoms of infection.

Study Design: This was a retrospective analysis of a cohort of women who delivered spontaneously between 16 and 36 weeks at a tertiary UK hospital.