Fetal weight prediction

Fetal weight prediction is an important part of prenatal care. There is a close relationship between fetal weight and fetal maturity. The use of ultrasound for selective obstetric biological measurement has become an effective means to judge fetal growth abnormalities and their types. Prenatal preparation Estimating fetal weight is important for choosing a mode of delivery to achieve a good perinatal outcome. Basic Information Specialist classification: maternity check check classification: ultrasound Applicable gender: whether women are fasting: not fasting Tips: Before the check, the taboo is poor, the diet is not proper, and the fatigue is excessive. Normal value No specific standards. Clinical significance Abnormal results: There is a difference between the predicted results and the actual results. The weight of the fetus is too large, resulting in an oversized body and difficulty in childbirth. People who need to be examined: pregnant women or people who need to have a fetal development check. Precautions Taboo before the examination: poor rest, improper diet, excessive fatigue. Requirements for inspection: Actively cooperate with the doctor's work. If the weight of the fetus falls within a reasonable growth curve, but the doctor tells the mother that the weight of the fetus is one week or one week larger than the number of weeks of pregnancy, the mother must not worry too much. It is acceptable that the weight of the fetus differs from the number of weeks of pregnancy by ± 2 weeks. If the growth of the fetus is "always" to maintain an average larger or smaller 1-2 weeks, it may be an error in the estimation of the menstrual cycle, but if the difference between the weight of the fetus and the number of weeks of pregnancy is more and more In the case of a big situation, it is necessary to further check the reasons. Inspection process The data required to be measured according to different calculation formulas are different. The formulas used are: Predicting fetal weight formula 1: fetal weight (g) = -4973.72+260.69*HC (head circumference) Predicting fetal weight formula 2: fetal weight (g) = -2686.60 + 171.48 * AC (abdominal circumference) Predicting fetal weight formula 3: fetal weight (g) = -2232.56 + 747.42 * FL (femur length) Predicting fetal weight formula four: fetal weight (g) = -2513.51 +1049.90 * FTH (fetal fat subcutaneous fat thickness) Predicting fetal weight formula five: fetal weight (g) = -5168.32+100.97*HC (head circumference) +110.86*AC (abdominal circumference) +143.09*FL (femur length) +331.43*FTH (fetal leg subcutaneous fat thickness) Predicting fetal weight formula 6: fetal weight (g) = 900 * BPD (double top diameter) – 5200 Predicting fetal weight formula seven: fetal weight (g) = 2900 + 0.3 * palace bottom height * chest circumference The above formula is only an estimate and does not represent the actual weight of the baby born. The purpose of predicting fetal weight is to detect problems in fetal development at an early stage. In general, the actual weight at birth and the predicted weight will have a plus or minus 10-15% error. For example, a birth weight of 4000 grams, the error range will be 400 grams. In other words, the bigger the baby's weight, the larger the margin of error. Not suitable for the crowd No taboos. Adverse reactions and risks No related complications and hazards.