Estimated Fetal Weight in Twin Pregnancy: How Good Are We?

1990 ◽  
Vol 39 (3) ◽  
pp. 395-399 ◽  
Author(s):  
D.M. Campbell ◽  
A.P. Smith ◽  
A.W. Wilson
Keyword(s):  
Multiple Pregnancy ◽  
Fetal Weight ◽  
Singleton Pregnancy ◽  
Femur Length ◽  
Biparietal Diameter ◽  
Multiple Measurements ◽  
Ultrasonic Assessment ◽  
Twin Pregnancies ◽  
Estimated Fetal Weight ◽  
Singleton Pregnancies

AbstractUltrasonic assessment of fetal weight derived from multiple measurements of the fetus has become accepted in clinical practice as being useful in singleton pregnancies. Several different formulae for estimating fetal weight have been derived from differing measurements of the fetus, such as biparietal diameter, trunk circumference, and femur length. To date, there has been no attempt to evaluate such a technique in multiple pregnancy. This study aims to see whether the formulae derived for singleton pregnancy are applicable to twin pregnancies. Estimated fetal weight will be derived by mathematical modelling from ultrasonic measurements made within a week of delivery and the results compared with the actual birthweight to give an indication of how good such estimated fetal weights are. Factors to be considered in the analysis include whether there are differences between Twin I and Twin II, differences of presentation with twins and differences by gestation at delivery.

scholarly journals A comparison of ultrasound with magnetic resonance imaging in the assessment of fetal biometry and weight in the second trimester of pregnancy: An observer agreement and variability study

Ultrasound ◽  
2018 ◽  
Vol 26 (4) ◽  
pp. 229-244 ◽  
Author(s):  
Jacqueline Matthew ◽  
Christina Malamateniou ◽  
Caroline L Knight ◽  
Kelly P Baruteau ◽  
Tara Fletcher ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Random Error ◽  
Fetal Weight ◽  
Abdominal Circumference ◽  
Resonance Imaging ◽  
Intra Class Correlation ◽  
Femur Length ◽  
Biparietal Diameter ◽  
Estimated Fetal Weight

Objective To compare the intra and interobserver variability of ultrasound and magnetic resonance imaging in the assessment of common fetal biometry and estimated fetal weight in the second trimester. Methods Retrospective measurements on preselected image planes were performed independently by two pairs of observers for contemporaneous ultrasound and magnetic resonance imaging studies of the same fetus. Four common fetal measurements (biparietal diameter, head circumference, abdominal circumference and femur length) and an estimated fetal weight were analysed for 44 ‘low risk’ cases. Comparisons included, intra-class correlation coefficients, systematic error in the mean differences and the random error. Results The ultrasound inter- and intraobserver agreements for ultrasound were good, except intraobserver abdominal circumference (intra-class correlation coefficient = 0.880, poor), significant increases in error was seen with larger abdominal circumference sizes. Magnetic resonance imaging produced good/excellent intraobserver agreement with higher intra-class correlation coefficients than ultrasound. Good interobserver agreement was found for both modalities except for the biparietal diameter (magnetic resonance imaging intra-class correlation coefficient = 0.942, moderate). Systematic errors between modalities were seen for the biparietal diameter, femur length and estimated fetal weight (mean percentage error = +2.5%, −5.4% and −8.7%, respectively, p < 0.05). Random error was above 5% for ultrasound intraobserver abdominal circumference, femur length and estimated fetal weight and magnetic resonance imaging interobserver biparietal diameter, abdominal circumference, femur length and estimated fetal weight (magnetic resonance imaging estimated fetal weight error >10%). Conclusion Ultrasound remains the modality of choice when estimating fetal weight, however with increasing application of fetal magnetic resonance imaging a method of assessing fetal weight is desirable. Both methods are subject to random error and operator dependence. Assessment of calliper placement variations may be an objective method detecting larger than expected errors in fetal measurements.

Spontaneous loss of a co-twin and the risk of birth defects after assisted conception

2016 ◽  
Vol 7 (6) ◽  
pp. 678-684 ◽  
Author(s):  
M. J. Davies ◽  
A. R. Rumbold ◽  
M. J. Whitrow ◽  
K. J. Willson ◽  
W. K. Scheil ◽  
...  
Keyword(s):  
Birth Defects ◽  
Pregnancy Loss ◽  
Multiple Pregnancy ◽  
Fetal Loss ◽  
South Australia ◽  
Increased Risk ◽  
Study Population ◽  
Infertility Patients ◽  
Twin Pregnancies ◽  
Singleton Pregnancies

The study of very early pregnancy loss is impractical in the general population, but possible amongst infertility patients receiving carefully monitored treatments. We examined the association between fetal loss and the risk of birth defects in the surviving co-twin in a retrospective cohort study of infertility patients within an infertility clinic in South Australia from January 1986 to December 2002, linked to population registries for births, terminations and birth defects. The study population consisted of a total of 5683 births. Births from singleton pregnancies without loss were compared with survivors from (1) pregnancies with an empty fetal sac at 6–8 weeks after embryo transfer, (2) fetal loss subsequent to 8-week ultrasound and (3) multiple pregnancy continuing to birth. Odds ratios (OR) for birth defects were calculated with adjustment for confounders. Amongst infertility patients, the prevalence of birth defects was 7.9% for all twin pregnancies without fetal loss compared with 14.6% in pregnancies in which there had been an empty sac at ultrasound, and 11.6% for pregnancies with fetal loss after 6–8 weeks. Compared with singleton pregnancies without loss, the presence of an empty sac was associated with an increased risk of any defect (OR=1.90, 95% confidence intervals (CI)=1.09–3.30) and with multiple defects (OR=2.87, 95% CI=1.31–6.28). Twin pregnancies continuing to birth without loss were not associated with an overall increased prevalence of defects. We conclude that the observed loss of a co-twin by 6–8 weeks of pregnancy is related to the risk of major birth defects in the survivor.

scholarly journals P19.08: Sonographically estimated fetal weight discordance and perinatal outcomes in twin pregnancies

2018 ◽  
Vol 52 ◽  
pp. 189-189
Author(s):  
H. Boo ◽  
S. Kim ◽  
Y. Han ◽  
M. Kim ◽  
Y. Lee ◽  
...  
Keyword(s):  
Perinatal Outcomes ◽  
Fetal Weight ◽  
Twin Pregnancies ◽  
Estimated Fetal Weight

Detection of the Small-for-Gestational Age Twin Fetus by a Two-Stage Ultrasound Examination Schedule

1982 ◽  
Vol 31 (3-4) ◽  
pp. 235-240 ◽  
Author(s):  
J.P. Neilson
Keyword(s):  
Early Pregnancy ◽  
Gestational Age ◽  
Small For Gestational Age ◽  
Ultrasound Examination ◽  
Ultrasonic Measurement ◽  
Two Stage ◽  
Crown Rump Length ◽  
Biparietal Diameter ◽  
Ultrasonic Assessment ◽  
Twin Pregnancies

Serial ultrasonic measurement of the biparietal diameter is an unsatisfactory means of detecting the small-for-gestational age (SGA) fetus in twin pregnancies. A new two-stage ultrasound examination schedule, highly effective in detecting the SGA singleton fetus, has been evaluated prospectively in 31 twin pregnancies. The schedule comprises ultrasonic assessment of gestational age in early pregnancy, followed by measurement of the product of the crown–rump length and trunk area of both fetuses at 34–36 weeks. All Nineteen SGA twin fetuses were detected using this schedule; the technique offers several other advantages over serial biparietal cephalometry.

scholarly journals VP41.01: Accuracy of ultrasound estimated fetal weight in twin pregnancies

2021 ◽  
Vol 58 (S1) ◽  
pp. 269-270
Author(s):  
H. Abbassi ◽  
A. Karoui ◽  
A. Ben Mansour ◽  
K. Dimassi
Keyword(s):  
Fetal Weight ◽  
Twin Pregnancies ◽  
Estimated Fetal Weight

scholarly journals An ultrasonographic estimated fetal weight reference for Japanese twin pregnancies

2018 ◽  
Vol 46 (2) ◽  
pp. 209-215
Author(s):  
Masaki Sekiguchi ◽  
Masashi Mikami ◽  
Chie Nakagawa ◽  
Mika Ozaki ◽  
Shinji Tanigaki ◽  
...  
Keyword(s):  
Fetal Weight ◽  
Twin Pregnancies ◽  
Estimated Fetal Weight

scholarly journals Sonographic Estimated Fetal Weight among Diabetics at ≥ 34 Weeks and Composite Neonatal Morbidity

2018 ◽  
Vol 08 (02) ◽  
pp. e121-e127
Author(s):  
Leen Al-Hafez ◽  
Michael Pirics ◽  
Suneet Chauhan
Keyword(s):  
Retrospective Study ◽  
Confidence Intervals ◽  
Gestational Age ◽  
Neonatal Morbidity ◽  
Fetal Weight ◽  
Inclusion Criteria ◽  
Increased Risk ◽  
Estimated Fetal Weight ◽  
Singleton Pregnancies

Objectives The objective was to assess the composite neonatal morbidity (CNM) among diabetic women with sonographic estimated fetal weight (SEFW) at 10 to 90th versus >90th percentile for gestational age (GA). Study Design The inclusion criteria for this retrospective study were singleton pregnancies at 34 to 41 weeks, complicated by diabetes, and that had SEFW within 4 weeks of delivery. Odds ratios (ORs) with 95% confidence intervals (CI) were calculated. Results Among the 140 cohorts that met the inclusion criteria, 72% had SEFW at 10th to 90th percentile for GA, and 28% at >90th percentile. Compared with women with diabetes with last SEFW at 10th to 90th percentile, those with estimate > 90th percentile for GA had a significantly higher rate of CNM (13 vs. 28%; OR, 2.65; 95% CI, 1.07–6.59). Among 109 diabetic women who labored, the rate of shoulder dystocia was significantly higher with SEFW at >90th percentile for GA than those at 10th to 90th percentile (25 vs. 2%; p = 0.002); the corresponding rate of CNM was 29 versus 10% (p = 0.02). Conclusion Among diabetic women with SEFW > 90th percentile for GA, CNM was significantly higher than in women with estimate at 10 to 90th percentile. Despite the increased risk of CNM, these newborns did not have long-term morbid sequela.

scholarly journals Estimation of Fetal Birth Weight Using Ultra Sonographic Parameters

1970 ◽  
Vol 39 (135) ◽  
pp. 284-286
Author(s):  
Kaveeta Dawaka ◽  
G C Das
Keyword(s):  
Birth Weight ◽  
Fetal Weight ◽  
Weight Estimation ◽  
Term Pregnancy ◽  
Femur Length ◽  
Actual Weight ◽  
Medical College ◽  
Biparietal Diameter ◽  
Fetal Birth Weight ◽  
The Mean

One hundred antenatal patients were studied at term pregnancy at Gauhati Medical College, Guwahati, andfetal birth weight estimation was done in utero Ultrasono-graphically. The parameters measured wereAbdominal Circumference (AC), Biparietal diameter (BPD) and Femur Length (FL), Fetal weightprediction was done with Shepards formula using AC and BPD as well as Hadlocks formula using FL andAC. The scan delivery interval was maintained at 72 hours or less. Results of both formulae were comparedwith the actual fetal birthweight taken within 15 minutes of delivery. With Shepards formula, the predictedfetal weight was within 100 gm of the actual fetal weight in 71% cases, within 150gm in 86% cases, within200 gms in 93% cases and within 250 gms in 98%. With Hadlocks formula, the predicted birthweight waswithin 100 gms of the actual fetal weight in 72% cases, within 150 gms in 83%, within 200 gms in 92%cases and within 300 gms in 98%. The mean percent error calculated as Error % = Predicted weight - actualweight divided by actual weight x 100 was 2.9% with Shepards formula and 3% with Hadlocks. These datathus support a significant correlation between ultrasonographic estimation and actual fetal birth weight.Key Words: Fetal birth weight, AC, BPD, FL

scholarly journals The impact of laser therapy on fetal growth discordance in twin-to-twin transfusion syndrome

2005 ◽  
Vol 5 (3) ◽  
pp. 313-317
Author(s):  
Renato A. Moreira de Sa ◽  
Salomon J. Laurent ◽  
Yuichiro Takahashi ◽  
Masami Yamamoto ◽  
Yves Ville
Keyword(s):  
Laser Therapy ◽  
Fetal Growth ◽  
Fetal Weight ◽  
Abdominal Circumference ◽  
Mean Values ◽  
Biparietal Diameter ◽  
Ultrasound Assessment ◽  
The Mean ◽  
The Impact ◽  
Estimated Fetal Weight

OBJECTIVES: to evaluate the impact of laser therapy on inter-twin discordance in twin-to-twin transfusion syndrome (TTTS). METHODS: biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC), femur length (FL) and estimated fetal weight were prospectively collected during a five-year period (1999 to 2004). The inter-twin discordance was expressed as a percentage of the largest twin's measurements. The measurements were made the day before laser, twice following laser and after delivery. The mean values of discordance in measurements and in fetal weight were calculated. ANOVA was used to compare mean values. RESULTS: the mean (SD) discordance for BPD, HC, AC, FL and estimated fetal weight the day before laser were 8.53% (5.28), 8.75% (2.76), 16.19% (4.85), 12.92% (5.13) and 28.50% (6.46) respectively. At the at 2nd ultrasound assessment after surgery were 4.37% (3.55), 3.73% (2.71), 8.90% (4.42), 6.61% (4.99) and 19.11% (8.01) respectively; and at birth the weight discordance was 18.55% (8.74). There was a significant decrease in discordance for HC and AC for each ultrasound assessment. CONCLUSIONS: there was a decrease in fetal growth discordance following laser therapy in TTTS. These changes might be related to re-adaptation of blood flow following laser therapy.

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