Kublickas M, Saltvedt S, Almström H, Grunewald C, Crossley J. Uncertainty in nuchal translucency reference ranges at 11-14 weeks of gestation--comparison to Swedish centiles.
Acta Obstet Gynecol Scand 2011;
90:654-8. [PMID:
21370996 DOI:
10.1111/j.1600-0412.2011.01116.x]
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Abstract
OBJECTIVE
To generate a regression equation for the nuchal translucency (NT) median for the Swedish population and compare this with other median values.
SETTING
Eight Swedish hospitals.
SAMPLE
The data set included 20 887 unaffected fetuses.
METHODS
Calculation and generation of an NT centile chart for the Swedish population.
RESULTS
The NT centiles for crown-rump length (CRL) from 45 to 84 mm were calculated and compared with the medians from Glasgow, from the Fetal Medicine Foundation (FMF, London, UK; FMF-original) and those published recently (FMF-new). The NT medians cease to increase at CRLs between 70 and 75 mm. The Swedish, FMF-new and Glasgow medians followed the same pattern, but the Glasgow NT median curve was systematically lower by around 20%. Swedish, FMF-new and Glasgow medians differed in shape from the FMF-original medians, which continuously increase throughout the whole range of CRLs.
CONCLUSIONS
Our results demonstrate that there are substantial differences in the NT medians and centiles between countries.
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