Curvas de normalidad de la longitud cervical ecográfica según edad gestacional en población española

Abstract

ObjectiveTo establish gestational age-dependent normal values of ultrasonographic assessment of cervical length in Spanish singleton and twin pregnancies. Subjects and methodsPregnant women undergoing routine ultrasound scans between weeks 12 and 36 at our unit were studied. Transvaginal ultrasound examinations were performed in 285 singleton pregnancies and in 281 twin pregnancies. The mean cervical length and the 5th and 95th percentiles were calculated for each gestational week and curves of normality were obtained. ResultsCervical length progressively decreased with gestational age. At the beginning of the second trimester, the 5th percentile was 25 mm in both singleton and twin pregnancies. In the third trimester, there was a sharp decrease, especially in twin pregnancies, reaching 15 mm in singleton pregnancies and less than 10 mm in twin pregnancies. ConclusionsOur results provide cut-off values for the clinical and investigational use of ultrasound measurement of cervical length. The differences between singleton and twin pregnancies warrant the use of adapted reference curves.