Nomogram of nuchal fold thickness of Thai fetuses.
No Thumbnail Available
Date
1998-04-12
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The aim of the study was to establish normal values of nuchal fold thickness during 14-21 weeks of pregnancy. Three hundred Thai pregnant women before 12 weeks of gestation were recruited. Gestational age was determined by last menstrual period and confirmed by crown-rump length. Subjects with date-size discrepancy of more than 7 days were excluded from the study. Nuchal fold thickness was measured twice, first during 14-17 weeks, and then during 18-21 weeks. Five hundred and nine measurements were obtained. Nomogram of nuchal fold thickness was constructed. Mean values of nuchal fold thickness increased steadily from 2.59 +/- 0.77 millimeters (mm) at 14 weeks to 4.12 +/- 0.98 mm at 21 weeks. Average rate of increase were 0.22 mm per week. In conclusion, nuchal fold thickness increased with advancing gestational age from 14 to 21 weeks of pregnancy. Different normal cut-off levels for each gestational week may be more appropriate for screening of fetal Down syndrome in Thai pregnant women.
Description
Chotmaihet Thangphaet.
Keywords
Citation
Manotaya S, Tanawattanacharoen S, Uerpairojkit B, Tannirandorn Y, Charoenvidhya D. Nomogram of nuchal fold thickness of Thai fetuses. Journal of the Medical Association of Thailand. 1998 Apr; 81(4): 297-300