Eze Charles, Ugwuja Mabel, Eze Cletus, Ugwu George, Agwuna Kennedy
University of Nigeria, Enugu Campus, Medical Radiography and Radiological Sciences.
University of Nigeria Teaching Hospital, Ituku-Ozalla, Radiation Medicine.
Afr Health Sci. 2014 Jun;14(2):334-8. doi: 10.4314/ahs.v14i2.7.
Common fetal parameters for gestational age (GA) estimation have pitfalls especially in advanced pregnancy and pregnancy complicated by fetal structural anomaly.
To assess the relationship between umbilical cord size and gestational age of the fetus.
A sonographic cross sectional study involving 300 pregnant women with GA between 14 weeks to 40 weeks was done in Enugu, Nigeria. Gestational ages were first estimated by use of Naegele's formula for GA estimation based on the date of onset of each subject's last menstrual period. Fetal parameters such as biparietal diameter, femur length, head circumference and abdominal circumference were measured and also used to estimate GA. Umbilical cord diameters were measured and used to compute the umbilical cord cross-sectional area.
The mean umbilical cord diameter and cross-sectional area were 14.5mm ± 7.2mm and 201.6mm ± 139.5mm(2) respectively. Umbilical cord growth rate of 1.0mm/week was noted between the 14(th) and 35(th) week of pregnancy. There were significant correlations (p < 0.001) between umbilical cord size and other fetal parameters for GA estimation.
Umbilical cord size had strong linear relationship with common fetal GA estimation parameters and could be used to compliment these parameters for GA estimation.
用于估计孕周（GA）的常见胎儿参数存在缺陷，尤其是在晚期妊娠以及合并胎儿结构异常的妊娠中。
评估脐带大小与胎儿孕周之间的关系。
在尼日利亚埃努古对300名孕周在14周至40周之间的孕妇进行了一项超声横断面研究。首先根据每位受试者末次月经开始日期，使用内格勒公式估计孕周。测量胎儿参数，如双顶径、股骨长度、头围和腹围，并用于估计孕周。测量脐带直径并用于计算脐带横截面积。
脐带平均直径和横截面积分别为14.5mm±7.2mm和201.6mm²±139.5mm²。在妊娠第14周和第35周之间观察到脐带生长速度为1.0mm/周。脐带大小与其他用于估计孕周的胎儿参数之间存在显著相关性（p<0.001）。
脐带大小与常见的胎儿孕周估计参数有很强的线性关系，可用于补充这些参数以进行孕周估计。
