During pregnancy, B-ultrasound is a common examination method that can determine the development of the fetus and whether there are any abnormalities. Therefore, pregnant women should undergo regular check ups. In the late stage of pregnancy, fetal weight can still be calculated through ultrasound data. Do you know about this, pregnant mother? Next, let's delve deeper together with the editor.
Calculate fetal weight based on ultrasound data
（1） The fetal weight (EFBW) is 1.07 * BPD * BPD * BPD+0.3 * AC * AC * FL BPD biparietal diameter AC abdominal circumference FL femur length, all measured in centimeters. The calculated weight is measured in grams.
（2） Predicting fetal weight
Formula 1: Fetal weight (grams)=-4973.72+260.69 * HC (head circumference) Predicts fetal weight
Formula 2: Fetal weight (grams)=-2686.60+171.48 * AC (abdominal circumference) predicts fetal weight
Formula 3: Fetal weight (grams)=-2232.56+747.42 * FL (femur length) to predict fetal weight
Formula 4: Fetal weight (grams)=-2513.51+1049.90 * FTH (subcutaneous fat thickness of fetal legs) predicts fetal weight
Formula 5: Fetal weight (grams)=-5168.32+100.97 * HC (head circumference)+110.86 * AC (abdominal circumference)+143.09 * FL (femur length)+331.43 * FTH (subcutaneous fat thickness of fetal legs) Predicted fetal weight
Formula 6: Fetal weight (grams)=900 * BPD (biparietal diameter) -5200 Predicted fetal weight
Formula 7: Fetal weight (grams)=2900+0.3 * Uterine floor height * Chest circumference predicts fetal weight
Explanation: The above calculation formula is only an estimate and does not represent the actual weight of the baby at birth.
The purpose of predicting fetal weight is to detect developmental issues early on. Generally speaking, there is a plus or minus 10-15% error between the actual weight at birth and the predicted weight. For example, if the birth weight is 4000 grams, the error range will be 400 grams. That is to say, the larger the baby's weight, the larger the margin of error.
What are the effects of ultrasound on fetuses
In most organs of the human body, damaging a few cells is not important, but if it damages reproductive cells or embryos in a sensitive developmental stage, the consequences are serious. So, during pregnancy, it is recommended not to have more than 3 ultrasound scans. Performing gynecological ultrasound during early pregnancy has a certain impact on newborns, while newborns who have undergone gynecological ultrasound in the middle and late stages of pregnancy have not shown any adverse effects. Therefore, early pregnancy gynecological ultrasound examination should be used with caution.
Ultrasound is a commonly used method for hospital examination. Pregnant women use ultrasound data to predict fetal size and choose the appropriate delivery method in the late stage of pregnancy. Pregnant women should follow the doctor's guidance before undergoing B-ultrasound examination. In other cases, it is not necessary to undergo B-ultrasound examination. Pregnant women during pregnancy must take good care of their health and provide their babies with a good environment for growth and development.
