Smaller than expected crown-rump length ultrasound measurements in 1st-trimester pregnancy: does it have any risk of subsequent pregnancies?

Abstract

Background and aims: Crown-rump length (CRL) measurement is usually used to predict threatened abortion or spontaneous miscarriage in early pregnancy. The present study aimed to examine whether there is any association between smaller-than-expected CRL and subsequent adverse pregnancy outcomes in the population under study. Materials and methods: This prospective study included 256 pregnant women with intrauterine, viable singleton spontaneous pregnancies with 6-13 weeks of gestation attending the Obstetrics and Gynaecology department,