BMC Pregnancy Childbirth
February 2023
Background: Recognizing premature newborns and small-for-gestational-age (SGA) is essential for providing care and supporting public policies. This systematic review aims to identify the influence of the last menstrual period (LMP) compared to ultrasonography (USG) before 24 weeks of gestation references on prematurity and SGA proportions at birth.
Methods: Systematic review with meta-analysis followed the recommendations of the PRISMA Statement.