Abstract: Preterm delivery is one of the main causes for perinatal complications and death. Many literatures focus
on preterm prediction study and evaluate every predictor. The predictors include cervical length and the size of some of fetal
organs measured by ultrasound; the level of fFN, IGFBP-1, IL investigated in cervicovaginal fluid, serum relaxin, CRP and
HbA1c in mother’s blood, MMP-8, MCP-1 and ITAC in amniotic fluid which correlated with infection. The purpose of these studies
is to find some more reliable factors to predict preterm delivery and improve the perinatal quality.

Key words: Preterm delivery, Threatened preterm delivery, Predictor