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P07Fetal gender determination in the first trimester using the transverse view: the importance of the third point
Author(s) -
Pedreira D. A. L.,
Yamasaki A.,
Czeresnia C.
Publication year - 2000
Publication title -
ultrasound in obstetrics and gynecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.202
H-Index - 141
eISSN - 1469-0705
pISSN - 0960-7692
DOI - 10.1046/j.1469-0705.2000.00004-1-7.x
Subject(s) - fetus , medicine , transverse diameter , obstetrics , pregnancy , singleton , gynecology , third trimester , anatomy , genetics , biology
Aim To determine the accuracy of fetal gender determination between 11–13 weeks of pregnancy. Material and methods Retrospective evaluation from October 1997 to July 1999. Transabdominal sonography using 3.5–5.0 MHz curvilinear probes. Fetal gender was evaluated at the transverse view of genital region. Male gender was considered when three hiperecogenic points, triangular in shape (probably corresponding to the escrotum (‘two points’) and falus (‘third point’) were visible. Female gender was considered when only two parallel white lines were observed (probably corresponding to the falus pointing to the caudal fetal region. Results 166 singleton pregnancies had fetal sex determined after birth and/or after cytogenetic results. Total accuracy in determining fetal sex was 82.1%. The most frequent error was evaluating as female the male fetuses.GA (weeks) CRL (mm) n CorrectN %11–11 + 6 43.8–55.3 46 35 76.1 12–12 + 6 55.4–67.9 74 60 81.1 13–13 + 6 68.0–81.7 46 43 93.5 Total 166 134 80.7Conclusions Recent studies on fetal sex determination in the first trimester used mainly the longitudinal view of the fetus to this evaluation. In this study, we describe the presence of the ‘third point’ as an important sign in the characterization of fetal gender, in the transverse view, during the first trimester.