Gestational dating ultrasound
Gestational dating ultrasound - Teensex chatlinr
Very small and very large babies have higher mortality and morbidity rates than infants of normal size . al., Evaluating the thresholds of abnormal second trimester multiple marker screening tests associated with intra-uterine growth restriction. Because early detection of growth abnormalities may help to prevent fetal demise and manage perinatal complications more appropriately , monitoring of fetal growth is an important part of antepartum care. The suggested results are not a substitute for clinical judgment.
Lackman F et al., have also advocated that "...intrauterine growth curves derived from ultrasonographically estimated fetal weight of continuing pregnancies are more appropriate than neonatal growth curves to discriminate fetuses and neonates at higher risk for adverse outcome ." [ 31] The use of customized fetal growth charts has been proposed to improve the precision in evaluating fetal growth . A Cochrane review concluded "There is insufficient evidence to determine whether SFH measurement is effective in detecting IUGR. We cannot therefore recommended any change of current practice. The distance from the top of the pubic bone (symphysis pubis) to the top of the pregnant uterus (fundus) is measured in centimeters (cm). The SFH in centimeters should be equal to the gestational age in weeks. The SOGC recommends the earliest ultrasound with a crown rump length equivalent to at least 7 weeks (or 10 mm) should be used to determine the gestational age.
The SOGC also recommends "...either the best CRL or the average of several satisfactory measurements should be used." The ACOG recommends "The measurement used for dating should be the mean of three discrete CRL measurements when possible..." . Further trials are needed."  When there are factors that increase the risk for intrauterine growth restriction (IUGR) or the SFH is unreliable because of maternal obesity, twin pregnancy, polyhydramnios, or the presence of uterine leiomyomas (fibroids) ultrasonography may be a better screening modality for growth problems in the fetus. Sonographic evaluation of intrauterine growth retardation. Prenatally the sonographically estimated fetal weight is used together with weight tables to evaluate fetal growth. A measurement discrepancy of more 3 cm is suggestive of a fetus with growth problems , an abnormal amniotic fluid level , a transverse lie, a twin pregnancy, or uterine fibroids [1,7]. The sensitivity of SFH measurement for detecting abnormal intrauterine growth was less than 35% in one study . found that the sensitivity of SFH measurement for detecting fetal growth abnormalities could be improved by serial plotting of the SFH on customized charts . Hadlock FP, et al., In utero analysis of fetal growth: a sonographic weight standard. Select the parameters and corresponding measured values to use, then press the 'Calculate' button The average singleton fetus weighs about 80 grams (2.8 ounces) by the end of the first trimester and grows increasingly faster after 22 weeks to reach a maximum growth rate of almost 220 grams (7.8 ounces) per week by 35 weeks '.