Comparison between clinical estimated fetal weights (CEFW) Versus Ultrasonographic estimated fetal weight (UEFW) for co-relation with actual birth weight (ABW) in 3rd Trimester of Pregnancy

Abstract

Background: Accurate prenatal estimation of birth weight is useful in the management of labour and delivery. 
 Objective: To determine the correlation between clinical estimated fetal weight with actual birth weight in 3rd trimester of pregnancy and to determine the correlation between Ultrasonographic fetal weight assessment with actual birth weight in 3rd trimester of pregnancy.
 Material & Methods: This cross sectional study with non-probability purposive sampling technique was conducted in three tertiary care hospitals of Punjab, Department of Obstetrics & Gynaecology, Allied Hospital, Faisalabad, Lady Aitcheson Hospital Lahore and Lady Willington Hospital Lahore. Informed consent was obtained from each female to use their data for research purpose. Demographic details were also noted. Then females undergo CEFW was done by using Johnson’s formula. Then ultrasonography was done on every female by experienced radiologists to get UEFW. FW measurement was done by using Shepard formula. Then females were followed-up till delivery of fetus. Actual birth weight (ABW) was noted on birth. Pearson correlation was used to measure the correlation coefficient for CEFW and UEFW with ABW. P-value≤0.05 was taken as significant.
 Results: In our study the mean age of the patients was 29.60±6.23 years and the mean gestational age of 33.30±2.31 weeks. The mean BMI value of the patients was 23.08±1.26 Kg/m2, the mean CEFW value 2219.60±556.41 grams while the mean UEFW value of the patients was 2227.77±521.94 grams and the mean value of ABW of the patients was 2284.00±515.29 grams. In our study the positive correlation was found between the CEFW, UEFW with ABW of the baby.
 Conclusion: Our study results concluded that both the clinical estimation ultrasonography estimation showed the feasible and reliable results. Both showed positive correlation with actual birth weight.

Correlation of estimated fetal weight by ultrasound and birth weight in low risk pregnancy: a prospective study

“…In the study positive correlation was found between the CEFW, UEFW with ABW of the baby concluding that both the clinical estimation ultrasonography estimation showed the feasible and reliable results. Both showed positive correlation with actual birth weight 11. …”

Estimation of Fetal Weight by Clinical Methods and Ultrasonography and Comparing With Actual Birth Weight

“…In measuring the height of the uterus, the distance between the upper extremity of the uterus and the upper edge of the symphysis of the pubis was considered to be zero points in the area of the symphysis of the pubis, and the strip meter stretched to the midline of the abdomen to the uterus and somewhere when the uterine peak was touched by the fingers; the height of the womb was measured in cm. To measure the abdominal circumference of the mother, the strip of the membrane in the position of the umbilicus passed through the abdomen and behind the mother, and the corresponding number was recorded in cm [6,9,10].…”

“…Also, for the calculation of N, the vaginal examination is performed: when the presenting part is at the minus station, N=13; presenting part was at 'zero' station, N=12; and presenting part was at plus station N=11. In measurements, the examination was done between contractions [6,9].…”

“…There are techniques for fetal weight estimation, most commonly, clinical and ultrasonography techniques. Clinical methods for fetal weight estimation include abdominal palpation, Johnson's formula, and Insler's formula (Dare's) [6][7][8]. Johnson's and Insler's formulas are used uterine height measurement to estimate fetal weight.…”