Korean J Obstet Gynecol.  1997 Sep;40(9):1916-1922.

Transvaginal Measurements of Fetal Crown-Rump Length during the First Trimester after In Vitro Fertilization and Embryo Transfer in Korean Women

• Yoon JS
• Park JS
• Hur CY
• Chai HD
• Jun JK
• Yoon BH
• Moon SY
• Syn HC

Abstract

The crown-rump length(CRL) remains the most accurate parameter used for gestational dating. We aimed to establish the early fetal growth with CRL range in Korean women. The CRL of 48 singleton pregnancies which resulted from in vitro fertilization and e mbryo transfer(IVF-ET) at SNUH were assessed two to six times in the first trimester by trans-vaginal ultrasonography. All women included in this study went on to deliver norma l infa-nts at 37 completed weeks or after weighing over 2.5 kg. And we also studied the r elationship between CRL(in millimeters) and gestational age(in days), and found that the fo llowing second-order polynomial might be applied either to expect CRL using the menstr ual gestational age, or to estimate gestational age using measured CRL(r2=0.980, p=0.000 1). CRL=0.0175(GA)2-1.049(GA)+19.17 GA=7.5593(CRL-3.45)1/2+29.97 Finally we compared our data with some of published articles which assessed CRL in spontaneous and induced pregnancies. In conclusion, this study establish the early fetal growth with CRL range in Korean women on the basis of exact ovulation timing using high resolution transvaginal ultrasonography. And these data will be of great use in the evaluation of fetal growth in the first trimester.

Keyword

Crown-rump length (CRL); In-vitro fertilization and embryo transfer (IVF-ET); Transvaginal ultrasonography

MeSH Terms

Crown-Rump Length*
Embryo Transfer*
Embryonic Structures*
Female
Fertilization in Vitro*
Fetal Development
Gestational Age
Humans
Ovulation
Pregnancy
Pregnancy Trimester, First*
Ultrasonography