Fetal mid-thigh soft-tissue thickness: a novel method for fetal weight estimation

Background: The Accurate estimation of fetal weight is important in modern obstetrics. Currently, Hadlock's formula is used widely for fetal weight estimation, which includes BPD, AC, FL and HC. The correct plane of measurement of various standard parameters is difcult to obtain especially in third trimester. Hence soft tissue thicknesses of the fetus are tested for correlation with birth weight in this study. Materials & Methods: A prospective observational study conducted among 90 pregnant females referred for Ultrasound examination in the third trimester with an interval from the ultrasound scan to delivery of ≤7 days from 2019 to 2020. Results: The measurements of abdominal, fetal mid-thigh and mid-arm soft tissue thicknesses correlated well with birth weight in a high statistically signicant positive linear relationship. A new regression model developed out of the soft tissue thicknesses(FASTT, FMASTT, FTSTT) correlates better than the Hadlock's model and Sujitkumar Hiwale et al model (For Indian population) based on BPD, HC, AC and FL Conclusion: Ultrasound measurement of soft tissue thickness may prove to be a strong predictor of fetal weight essential for sonographic assessment of pregnancy. They are easy and simple hence fetal soft tissue thickness measurements, both two- and three-dimensional, may prove to be a diagnostic parameter that has as small an error rate as possible, is quick to use and reproducible by different examiners

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INTEGRATION OF FETAL MID THIGH SOFT TISSUE THICKNESS IN ULTRASOUND BIRTH WEIGHT ESTIMATION FORMULA INCREASES THE ACCURACY OF FETAL WEIGHT ESTIMATION NEAR TERM

Asian Journal of Pharmaceutical and Clinical Research ◽

10.22159/ajpcr.2018.v11i4.23776 ◽

2018 ◽

Vol 11 (4) ◽

pp. 446

Author(s):

Shripad Hebbar ◽

Sukriti Malaviya ◽

Sunanda Bharatnur

Keyword(s):

Birth Weight ◽

Prediction Models ◽

Fetal Weight ◽

Abdominal Circumference ◽

Estimation Methods ◽

Weight Estimation ◽

Singleton Pregnancy ◽

Fetal Biometry ◽

Fetal Weight Estimation ◽

Soft Tissue Thickness

Objective: The objective of the study was to find whether incorporation of MTSTT in fetal weight estimation formulae which are traditionally based on biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC), and femur length (FL) improves birth weight (BW) estimation. Methods: In a prospective observational study, MTSTT was measured within 1 week of delivery in 100 women with term singleton pregnancy along with other standard biometric parameters, i.e. BPD, HC, AC and FL, and MTSTT. Multiple regression analysis was carried out using PHOEBE regression software using different combinations of biometric variables to find out the best fit model of fetal weight estimation. The predicted BW was compared with actual neonatal BW soon after delivery and regression coefficients (R2) were determined for each of prediction models for comparing the accuracies. Results: Mean gestational age at delivery was 38.4±1.08 weeks and the BW of neonates varied between 2.18 kg and 4.38 kg (mean ± standard deviation: 3.07±0.43 kg). By adding MTSTT to BPD, HC, AC, and FL, we obtained the formula Log 10 (BW) = −0.14783+0.00725 *BPD +0.00043 *HC +0.00436 *AC +0.01942 *FL +0.16299 *MTSTT, which had a very good Pearson regression coefficient ((r2: 0.89 p<0.001) compared to conventional models based on standard fetal biometry. All prediction models had better strength of correlation when combined with MTSTT (p<0.001). The routine four parameter formula could identify 45% and 80% of fetuses within 5% and 10% weight range; pick up rate was further increased to 61% and 95% by addition of MTSTT. Conclusion: It is evident that addition of MTSTT to other biometric variables in models of fetal weight estimation improves neonatal BW prediction (r2=0.89).

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Evaluation of Fetal Mid-Thigh Soft Tissue Thickness and Femur Length for Estimation of Fetal Birth Weight

Women Health Care and Issues ◽

10.31579/2642-9756/023 ◽

2020 ◽

Vol 3 (2) ◽

pp. 01-10

Author(s):

Nareman Elhamamy

Keyword(s):

Birth Weight ◽

Soft Tissue ◽

Fetal Weight ◽

Tissue Thickness ◽

Femur Length ◽

Soft Tissue Thickness ◽

Percent Difference ◽

Fetal Birth Weight ◽

Kappa Value ◽

The Difference

Accurate calculation of fetal weight relies on two equally important factors: the use of a formula with strong intrinsic properties, and the use of sonographic biometric parameters that are not susceptible to errors in measurement. From a statistical perspective, the inclusion of multiple variables in a model improves multicollinearity chances and decreases each measurement's internal error. Precisely predicting estimated fetal weight during childbirth may have a significant impact on successful obstetric management, especially in the case of suspected macrosomia or low birth weight. Macrosomic fetuses can cause maternal and neonatal complications during childbirth, and low-born fetuses are at increased risk for perinatal morbidity and mortality. The main aim of the study was to assess the accuracy of measurement of mid-thigh soft tissue thickness and femur length, in estimation of expected fetal birth weight The study was conducted during the period January 2017 to August 2019, at Tanta University hospitals, Obstetrics & Gynecology department. 65 pregnant ladies at term (between 37-40weeks) were included in the study. Results: Mean difference between fetal weight by Hadlock formulae and actual fetal weight is -10.88g; percent difference is (0.32%). The difference statistically insignificant p>0.05. Mean difference between fetal weight by Scioscia’s formulae and Actual fetal weight is 2.83; the percent difference is (0.08%). The difference statistically insignificant p>0.05. Good agreement between Hadlock formulae and Actual Fetal Weight Kappa value (0.73).Also shows moderate agreement between Scioscia’s formulae and Actual Fetal Weight Kappa value (0.52). area under curve Hadlock formulae (0.79), Scioscia’s formulae (0.78) for detecting fetal weight ≥3500gm among pregnant women at 39-40 weeks of gestation. Conclusion: The mid-thigh soft tissue thickness and femur length can be used in estimation of expected fetal birth weight like as other sonographic parameters. The validity of Scioscia's formulae is not better than Hadlock formulae in detection of fetal weight less than 3500 gm. The validity of both formulae Scioscia's and Hadlock in detection of fetal weight more than 3500 gm. Reduced and cannot be dependable in extremes of weight.

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Estimation of fetal weight by measurement of fetal thigh soft-tissue thickness in the late third trimester

Ultrasound in Obstetrics and Gynecology ◽

10.1002/uog.5253 ◽

2008 ◽

Vol 31 (3) ◽

pp. 314-320 ◽

Cited By ~ 30

Author(s):

M. Scioscia ◽

F. Scioscia ◽

A. Vimercati ◽

F. Caradonna ◽

C. Nardelli ◽

...

Keyword(s):

Soft Tissue ◽

Fetal Weight ◽

Tissue Thickness ◽

Third Trimester ◽

Soft Tissue Thickness

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Assessment of accuracy of two dimensions ultrasonography of fetal thigh soft tissue versus Hadlock's formula in estimation of fetal weight

QJM ◽

10.1093/qjmed/hcab115.023 ◽

2021 ◽

Vol 114 (Supplement_1) ◽

Author(s):

Mohamed Abdel Fattah Elsenity ◽

Mohamed Abdel Aziz El Sayed El Zeiny ◽

Marwa Radwan Abbass Shahin ◽

Adel Shafik Salah El-Din

Keyword(s):

Soft Tissue ◽

Comparative Study ◽

Pregnant Women ◽

Maternity Hospital ◽

Two Dimensions ◽

Fetal Weight ◽

Study Group ◽

Weight Estimation ◽

Fetal Weight Estimation ◽

Better Than

Abstract Objective The current study aims to compare between mid-thigh soft tissue formula and modified mid-thigh soft tissue formula with Hadlock formula in estimation of fetal weight. Materials and methods Two hundred full term pregnant women attending Ain Shams Maternity Hospital in the period from April 2018 and April 2019 were included in this comparative study. Whole study group (200 women) had 2D ultrasonography using Hadlock's formula, thigh soft tissue formula and Modified thigh soft tissue formula. Results In our current study Hadlock's formula was better than thigh soft tissue and modified thigh soft tissue formula in estimation of fetal weight. Conclusions Fetal mid-thigh SST is a simple, useful, and easily applicable parameter for fetal weight estimation.

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