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Updated: Jun 27, 2026
08:04
Murine Fetal Echocardiography
Published on: February 15, 2013
Sonographic fetal sex determination.
Marwan Odeh1, Vatali Granin, Mohamed Kais
1Department of Obstetrics and Gynecology, Western Galilee Hospital, Nahariya, Israel. marwan20@bezeqint.net
Obstetrical & Gynecological Survey
|December 23, 2008
Summary
Accurate fetal sex determination via ultrasound is possible after 13 weeks gestation, primarily using the "sagittal sign" in early pregnancy. Malformations can affect accuracy, but 3D ultrasound may help identify them.
Area of Science:
- Obstetrics and Gynecology
- Medical Imaging
- Fetal Medicine
Background:
- Sonographic fetal sex determination is a common obstetric procedure.
- Accuracy can be challenging in certain cases and gestational ages.
Purpose of the Study:
- To review the accuracy and methods of sonographic fetal sex determination.
- To highlight key sonographic landmarks and potential pitfalls.
Main Methods:
- Review of sonographic techniques for fetal sex determination.
- Analysis of accuracy based on gestational age and external genitalia development.
- Discussion of the
- sagittal sign
- and other sonographic markers.
- Consideration of 3D ultrasound's role.
Main Results:
- Fetal sex determination is inaccurate before 12 weeks gestation.
- Accuracy reaches 99-100% after 13 weeks in uncomplicated cases.
- The
- sagittal sign
- is crucial for early determination; direct visualization is used later.
- Malformed genitalia can lead to inaccurate results.
Conclusions:
- Sonographic fetal sex determination is highly accurate after 13 weeks gestation.
- Understanding key sonographic landmarks improves diagnostic precision.
- Congenital anomalies of the genitalia necessitate careful evaluation.
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