The Impact of Dating Twin Pregnancy by the Larger, Smaller or Mean Twin Crown-Rump Length: A Retrospective Cohort Study.

ABSTRACT:

Objective

To evaluate the impact of twin dating by ultrasound-measured crown-rump length (CRL) of the larger (CRL-L), smaller (CRL-S) or mean twin measurement (CRL-M) on the rates of preterm birth (PTB) and detection of small for gestational age (SGA) births.

Design

A retrospective cohort study.

Setting

A tertiary fetal medicine centre (London, UK).

Population or sample

All twin pregnancies between 1998 and 2023 who underwent first trimester CRL ultrasound assessment and fetal growth assessment.

Methods

Data collection included CRL measurement, estimated fetal weight (EFW), pregnancy outcome and birthweight (BW) for each twin. Pregnancies were retrospectively re-dated by CRL-S, CRL-L and CRL-M.

Main outcome measures

SGA < 10th centile and extreme

SUBMITTER: Blayney GV 

PROVIDER: S-EPMC11879912 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature