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Human Reproduction, Vol. 14, No. 8, 2102-2105, August 1999
© 1999 European Society of Human Reproduction and Embryology

The feasibility of nuchal translucency measurement in higher order multiple gestations achieved by assisted reproduction

R. Maymon1, E. Dreazen, Y. Tovbin, I. Bukovsky, Z. Weinraub and A. Herman

Department of Obstetrics and Gynecology, Assaf Harofe Medical Center, Zerifin (affiliated with Sackler Faculty of Medicine, Tel Aviv), 70300 Israel

Nuchal translucency (NT) measurement for screening chromosomal abnormalities and detecting fetal anomalies is an effective ultrasonographic marker, originally developed for singleton pregnancies. This study sought to evaluate the feasibility of NT measurements in higher order multiple gestations. Pregnant patients who conceived following assisted reproduction and were carrying three or more fetuses were enrolled in the study. Each fetus was ultrasonographically assessed, a NT measurement was obtained, and the findings were used for counselling prior to any invasive procedure. In all, 24 pregnant patients, initially carrying 79 fetuses aged 10–14 weeks of gestation, were compared with 79 consecutively matched, singleton controls, naturally conceived, having similar crown–rump lengths (± 3 mm). NT measurements were feasible for both study and control fetuses, which exhibited similar NT measurements for 5th, 50th and 95th centiles. Also, mean NT thicknesses [measurements in mm or multiple of the medians (MOM)] were similar for both groups (1.41 ± 0.41 and 1.35 ± 0.39 mm respectively and 0.87 ± 0.23 and 0.83 ± 0.25 MOM respectively). Prenatally no chromosomal abnormalities were detected in either group, and, of those infants who had no karyotyping, no traits were observed that warranted chromosomal analysis. NT measurements are feasible in higher order multiple gestations. Since there is no other effective screening modality for these pregnancies, it seems reasonable to recommend NT measurement for antenatal screening services for higher order multiple gestations.

Key words: multiplicity of higher order gestations/nuchal translucency/ultrasound

1 To whom correspondence should be addressed


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