Cervical Length Changes From the First to Second Trimester of Pregnancy, and Prediction of Preterm Birth by First‐Trimester Sonographic Cervical Measurement

Abstract

Cervical length in the first trimester depends on maternal characteristics and a history of cervical surgery. The cervix exhibits minimal changes from 11 to 24 weeks for most women, although the shortening is more prominent in women with a history of cervical surgery or preterm delivery. First-trimester cervical length measurement can predict preterm delivery.