Fetal crown–rump length and estimation of gestational age in an ethnic Chinese population

Abstract

Objectives To develop a sonographic dating formula based on fetal crown-rump length (CRL) in a Hong

Risk Factors for Haemorrhage during Suction Curettage after Uterine Artery Embolization for Treating Caesarean Scar Pregnancy: A Case-Control Study

“…Weeks of gestation were determined from each patient's history, and the size of the gestational sac or the embryo was measured by transvaginal ultrasonography. We used the following formulae for calculating the weeks of gestation: (1) weeks of gestation = (mean sac diameter [mm] + 30) / 7 [13]; (2) weeks of gestation = (26.643 + 7.822 × CRL [mm] 1/2 ) / 7 [14]. The mean sac diameter and the CRL were all measured in millimetres.…”

Assessment of sonographer nuchal translucency measurement performance – central tendency and dispersion

“…Comparison of our center specific expected nuchal translucency versus crown rump length with that of others reported in other populations. Crown rump length was converted to gestational age in days rounded to the nearest day to determine expected nuchal translucency from the formula published by Lam et al using our published dating formulae [12,19].…”

“…All scans were performed by sonographers accredited by the FMF to assess the fetal NT. Gestational age at time of examination was determined from the CRL measurement [12].…”

Comment déterminer la date de début de grossesse ?

“…Outre l'avantage de diminuer le taux de déclenche-ment pour grossesse prolongée après 41 +0 ou 42 +0 SA [36], l'échographie du premier trimestre permet de mesurer la clarté nucale [43], de chercher d'autres marqueurs d'aneuploïdie [44] et d'effectuer un premier examen morphologique foetal [45].…”