Dating Scan

Evans J.
Fetal crown rump length values in the first trimester based upon ovulation timing using lutenizing hormone surge.
1991; 98(1): 48-51, Abstract

Fetal crown rump length (CRL) was measured weekly in 33 singleton pregnancies conceived after in vitro fertilization, gamete intrafallopian transfer or natural intercourse in monitored infertility treatment cycles. There was no difference in the CRL between different infertility groups. However the CRL was found to be smaller than the CRL measurement from pregnancies where the gestational age was based on the last menstrual period.

Chervenak KA, Skupski DW, Romero R, Myers MK, Smith-Levitin, Rosrnwaks Z, Thaler HT.
How accurate is fetal biometry in the assessment of fetal age?
American Journal of Obstetrics and Gynecology. 1998; 178: 678-87, Abstract

Retrospective study of 152 singleton, 67 twin and 19 triplet gestations resulting from in vitro fetilization, comparing gestational age as defined by fetal biometry at 14-22 weeks and a gestation age prediction equation. Fetal biometry proved accurate and head circumference was the most accurate parameter.

Taipale P, Hilesmaa,V.
Prediction delivery date by ultrasound and last menstrual period by early gestation.
Obstetrics and Gynecology 2001; 97: 189-194, Abstract

Safety

Kieler H, Ahlsten G, Haglund B, Salvesen K, Axelsson O.
Routine ultrasound screening in pregnancy and the children's subsequent neurologic development.
Obstetrics and Gynecology 1998; 5(1): 750-6, Abstract.

A follow up study of 3265 children aged 8-9 whose mothers participated in a randomised controlled trail of ultrasound screening during pregnancy. There was no significant difference in the frequency of impaired neurological development in either exposed or non exposed groups.

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