scholarly journals Third trimester Sonographic estimated fetal weight - What factors affect its’ accuracy

2022 ◽  
Vol 226 (1) ◽  
pp. S164
Author(s):  
Michal Ovadia ◽  
Chen Key ◽  
Gal Cohen ◽  
Sivan Farladansky Gershnabel ◽  
Tal Biron-Shental ◽  
...  
Keyword(s):  
Fetal Weight ◽  
Third Trimester ◽  
Estimated Fetal Weight

Discrepancy Analysis between Clinical Versus Ultrasound Estimated Fetal Weight and Actual Birth Weight at 3rd Trimester

2019 ◽  
Vol 11 (1) ◽  
pp. 32-38
Author(s):  
Naznin Rashid Shewly ◽  
Menoka Ferdous ◽  
Hasina Begum ◽  
Shahadat Hossain Khan ◽  
Sheema Rani Debee ◽  
...  
Keyword(s):  
Birth Weight ◽  
Low Birth Weight ◽  
Fetal Weight ◽  
P Value ◽  
Weight Estimation ◽  
Third Trimester ◽  
Mortality And Morbidity ◽  
Fetal Weight Estimation ◽  
Obstetric Management ◽  
Estimated Fetal Weight

Background: In obstetric management fetal weight estimation is an important consideration when planning the mode of delivery in our day to day practice. In Bangladesh low birth weight is a major public health problem & incidence is 38% - 58%. Neonatal mortality and morbidity also yet high. So accurate antenatal estimation of fetal weight is a good way to detect macrosomia or small for date baby. Thus to improve the pregnancy outcome and neonatal outcome decreasing various chance of neonatal mortality and morbidity antenatal fetal weight prediction is an invaluable parameter in some situation where to identify the at risk pregnancy for low birth weight become necessary. Reliable method for prenatal estimation of fetal weight two modalities have got popularity - Clinical estimation and another one is ultrasonic estimation. This study was designed to determine the accuracy of clinical versus ultrasound estimated fetal weight detecting the discrepancy with actual birth weight at third trimester. So that we can verify more reliable and accurate method. Objectives: To find out more accurate and reliable modality of fetal weight estimation in antenatal period during obstetric management planning. To compare clinical versus ultrasound estimated fetal weight & to determine discrepancy of both variable with actual birth weight. Method: This prospective, cross sectional analytical study was carried out in Dhaka Medical College Hospital from January 2006 to December 2006. By purposive sampling 100 pregnant women fulfilling inclusion criteria were included in my study in third trimester (29wks-40wks). In clinical weight estimation procedure SFH (Symphysio Fundal Height) was measured in centimeter. On pervaginal finding whether vertex below or above the ischial spine was determined. By Johnson’s formula fetal weight in grams was estimated. Then by ultrasound scan different biometric measurements were taken and finally by Hadlock’s formula fetal weight was estimated. Eventually actual birth weight was taken after birth by Globe Brand weighing machine. Accuracy of both modalities were compared and which one was more reliable predictor was determined by statistical analysis. Results: After data collection were analyzed by computer based software (SPSS). There was gradual and positive relationship between symphysiofundal height and estimated birth weight. Discrepancy between clinical and actual birth weight at third trimester was statistically significant – Paired Student’s ‘t’ test was done where p value was <0.001. Whereas discrepancy between sonographically estimated fetal weight with actual birth weight was not statistically significant (by paired ‘t’ test where p value was >0.05). That implies discrepancy between ultrasound estimated fetal weight and actual birth weight was significantly less than that of clinically estimated fetal weight. 14% clinically and 46% sonographically estimated fetal weight were observed within £ 5% of actual birth weight. 31% clinical and 42% sonographically estimates observed within 6% to 10% of actual birth weight and 55% clinical and 12% sonographically estimate were >10% of actual birth weight. That is about 88% sonographical versus 45% clinical estimates were within 10% of actual birth weight. Conclusion: There is no doubt about importance of fetal weight in many obstetric situations. Clinical decisions at times depends on fetal weight. Whether to use oxytocin, to use forceps or vacuum for delivery or extend of trial or ended by Caesarian section immediately or no scope of trial to be largely depend on fetal size and weight. So more accurate modality for antenatal fetal weight estimation has paramount importance. In my study sonographically estimated weight have more accuracy than that of clinical estimate in predicting actual birth weight. Sonographically estimated fetal weight is more reliable, accurate and reproducible rather than other modality. J Shaheed Suhrawardy Med Coll, June 2019, Vol.11(1); 32-38

scholarly journals Historical development of estimated fetal weight calculation

2021 ◽  
pp. 18-25
Author(s):  
A.Yu. Alekseeva ◽  
◽  
A.M. Ziganshin ◽  
Keyword(s):  
Fetal Weight ◽  
Resonance Imaging ◽  
Accurate Calculation ◽  
Magnet Resonance Imaging ◽  
Third Trimester ◽  
The Third ◽  
Weight Calculation ◽  
Instrumental Approaches ◽  
Magnet Resonance ◽  
Estimated Fetal Weight

Accurate calculation of the estimated fetal weight is necessary for the choice of a correct approach to management of labour. Th e existing methods are not universal and require complex application. Th is article presents a review of literatures published in PubMed and Google Scholar databases in 1955-2021 and devoted to historical aspects in development of the existing clinical and instrumental approaches to calculation of estimated fetal weight. The paper presents existing methods for calculation of estimated fetal weight at diff erent gestational ages as well as methods making it possible to predict fetal weight before gestation onset. Data on their informative value during the third trimester and alterations in their accuracy depending on the pregnant patient’s BMI are presented. Th e topic of application of magnet-resonance imaging for fetometry is considered with comparison of this approach to a more common method of ultrasonography.

scholarly journals Relationship between Sonographic Umbilical cord Diameter and Gestational Age in Third Trimester of Pregnancy

2021 ◽  
pp. 20-27
Author(s):  
Sara Essam ALdabouly ◽  
Mohamed Mohsen El Namori ◽  
Mona Khaled Omar ◽  
Essmat Hamdy AboZeid
Keyword(s):  
Pregnant Women ◽  
Umbilical Cord ◽  
Fetal Growth ◽  
Gestational Age ◽  
Umbilical Vein ◽  
Well Being ◽  
Fetal Weight ◽  
University Hospital ◽  
Third Trimester ◽  
Estimated Fetal Weight

Background: Throughout the fourth week of embryonic development the umbilical cord (UC) is formed, which corresponds to the fifth to the twelfth weeks of gestation. Fetuses with intrauterine growth restriction (IUGR) have leaner UCs than fetuses of appropriate gestational age do, and the caliber of the umbilical vein decreases significantly, resulting in a worsening of the Doppler parameters of the umbilical artery in the mother. The goal of this study was to evaluate the significance of sonographic UC diameter in determining gestational age in third trimester in pregnant women. Methods: We conducted a comparative cross-sectional research on 300 pregnant women aged range between (20-35) years, singleton gestation, gestational age (3rd) trimester estimated from antenatal mothers last menstrual period (LMP), viable fetus, presenting to obstetrics and gynecology department at Tanta university hospital. Results: Highly statistically significant positive correlation between UC diameter and gestational age, BPD, FL, AC, AFI, and estimated fetal weight was found. The increase in UC diameter was positively and significantly correlated with the increase in gestational age and estimated fetal weight, indicating that those who have prolonged gestational age and estimated fetal weight are more likely to have wider UC diameter. Conclusions: The UC diameter (UCD) has the potential to be a valuable indicator of fetal growth, well-being, and perinatal outcome. Sonographic measurement of UC diameter could be an efficient method of measuring fetal growth and predicting gestational age (GA), particularly between 28-40 weeks GA. It is possible that abnormal UC diameter can be a strong indicator to identify antenatal mothers at risk for IUFD and poor fetal outcomes.

Accuracy of Estimated Fetal Weight in Third Trimester [33A]

2020 ◽  
Vol 135 ◽  
pp. 16S-17S
Author(s):  
Bertha Alicia Castro-Vasquez ◽  
Claudia Taboada
Keyword(s):  
Fetal Weight ◽  
Third Trimester ◽  
Estimated Fetal Weight

Sonographic Estimated Fetal Weight Within an Indian Cohort: Is the Hadlock Four Regression Model Appropriate or Does It Merit Adjustments?

2021 ◽  
pp. 875647932110466
Author(s):  
Upendra Kumar Joish ◽  
Tukaram Rathod ◽  
Prabhu S. Anitha
Keyword(s):  
Regression Model ◽  
Fetal Weight ◽  
Percentage Error ◽  
Third Trimester ◽  
Fetal Biometry ◽  
Pearson Coefficient ◽  
The Mean ◽  
Infant Birth ◽  
Strength Of Association ◽  
Estimated Fetal Weight

Objective: Sonographic estimated fetal weight (EFW) has an influence on the management of a pregnancy. The Hadlock 4 regression model (Hadlock-4), based on fetal biometry, is widely used. There are significant discrepancies noted between EFW, using Hadlock-4, compared to the actual infant birth weights (ABW) in the author’s clinical practice. The research objective was to compare the EFW, using Hadlock-4, with ABW and determine minor arithmetic modifications needed for this population. Materials and Methods: A prospective observational study was done enrolling women in the third trimester, who underwent sonography and delivered within a week of the examination. The sonographic cases were divided into class intervals by gestational age. The EFW were compared with the ABW, using a Pearson coefficient and mean percentage errors (MPE). The EFW values were increased or decreased, by a certain percentage, to keep the mean percentage error in an acceptable range. Results: The strength of association between the EFW and ABW was 0.69 ( p = .014). The EFW and the MPEs for women delivering at 36-40 weeks and beyond was significantly more (13.2 and 18.2%). The EFWs at 36-40 weeks and beyond 40 weeks were reduced by 3 and 8% respectively, which reduced the MPEs. After this modification 97.6% of ABWs fell within +/-2 standard deviations of the EFWs. Conclusion: A simple 3 and 8% reduction of EFWs, using the Hadlock-4, with those sonographic examinations at 36-40 weeks and beyond 40 weeks gestation respectively, is proposed to increase reliable in this Indian patient practice.

Sign in / Sign up

Export Citation Format

Share Document