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胎儿宫内发育迟缓(IUGR)是指胎儿体重低于同胎龄儿的第10百分位(P_(10)),或胎儿预测体重低于相应孕周胎儿体重的2个标准差(2S)以下.IUGR 的出生前诊断和防治,是围产期胎儿监护的重要内容之一。应用超声诊断法直接测量胎儿各部之径线,来观察其生长发育情况,指标明确,重复性好,对胎儿损害小,无创伤,为目前较常用的方法,现分述如下.1 孕周(GW)的推算1.1 胚囊(GS)直径测量GS 在妊娠5周时超声显像能显示,6～10周时测量较合适,妊娠12周时GS 与宫壁融合无法测量.胎龄6周起可测GS.正常每日GS 增大1mm,每周约增长0.716cm,GW 与GS 关系为GS=0.5512×GW-1.003。正常妊娠GS 的值(cm),可参照张凤荣所报道的结果.
Intrauterine growth retardation (IUGR) means that the fetal weight is lower than the 10th percentile (P_ (10)) of the same gestational age or that the predicted weight of the fetus is less than 2 standard deviations (2S) The following .IUGR prenatal diagnosis and prevention and treatment, is one of the important aspects of perinatal fetal monitoring. Ultrasound diagnosis of direct measurement of the fetal line diameter, to observe the growth and development, clear indicators, good repeatability, small damage to the fetus, noninvasive, as the more commonly used methods are as follows.1 gestational age GW) 1.1 Determination of the diameter of the sac in the embryo sac (GS) Ultrasound imaging of GS at 5 weeks of gestation shows that the measurement is suitable at 6 to 10 weeks, and the fusion of GS and the uterine wall can not be measured at 12 weeks gestation. GS can be measured normal daily increase of 1mm GS, an increase of about 0.716cm per week, GW and GS for the GS = 0.5512 × GW-1.003. Normal pregnancy GS value (cm), can refer to Zhang Fengrong reported results.