2015, Number 04
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Ginecol Obstet Mex 2015; 83 (04)
Sonographic fetal sex determination in the first trimester: study in 2314 pregnancies and literature review
González BI, Savirón CR, Lerma DPD, De León LJ
Language: Spanish
References: 12
Page: 207-212
PDF size: 500.62 Kb.
ABSTRACT
Objective: To evaluate the success rate and reliability of fetal sex
determination in first trimester between 11-13+ 6 weeks and make a
comparative study with other studies.
Material and methods: A cohort study was performed. 2314 first trimester
pregnancy ultrasounds were examined. For fetal sex estimation, the
method of a sagittal section and the relation between the angle formed
by the genital tubercle and spinal column was used.
Results: Diagnosis of fetal sex was issued in 1986 cases with 90.1%
success rate. In 328 cases (14.2%) no gender assignment was achieved.
A directly proportional relationship between success rate in fetal sex
diagnosis and crown-rump length (CRL) (p ‹ 0.001) was described; with
CRL over 65 mm, the prediction of fetal sex is above 95% and from 77
mm is close to 100%. With CRL ‹ 51 mm, the success rate is less than
80% in both sexes.
Conclusion: The simplest and best performing technique is the relation
between the angle formed by the genital tubercle and spinal column.
Success rate below 60 mm is less than 90% overall, so it would have to
be wary of establishing the fetal sex, especially if it involves a decision
as to avoid an invasive test.
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