How to know fetal weight
As pregnancy progresses, one of the issues that expectant parents are most concerned about is the growth and development of the fetus, especially the fetal weight. Knowing the fetal weight not only helps assess its health, but also provides a reference for choosing the mode of delivery. This article will introduce in detail how to calculate fetal weight, and attach hot topics and hot content in the past 10 days to help expectant parents better master relevant knowledge.
1. How to calculate fetal weight
Currently, fetal weight is mainly measured in medicine through ultrasound examination and clinical estimation. Here’s how:
| Calculation method | Specific operations | Advantages and Disadvantages |
|---|---|---|
| Ultrasound examination | The fetal biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC), and femur length (FL) were measured, and weight was calculated using a formula. | The accuracy is high, but professional equipment is required. |
| clinical estimate | By measuring the uterine height and abdominal circumference of the pregnant woman, the fetal weight is estimated using a formula. | The operation is simple, but the error is large. |
2. Commonly used formulas for ultrasonic examination
Ultrasound examination is the most commonly used method to measure fetal weight. The following are several common calculation formulas:
| Formula name | Calculation formula | Applicable gestational age |
|---|---|---|
| Hadlock formula | Log10(weight) = 1.3596 - 0.00386(AC×FL) + 0.0064(HC) + 0.00061(BPD×AC) + 0.0424(AC) + 0.174(FL) | whole pregnancy |
| Shepard formula | Log10(weight) = -1.7492 + 0.166(BPD) + 0.046(AC) - 0.002646(AC×BPD) | 28-40 weeks |
3. Hot topics and content in the past 10 days
The following are recent hot discussion topics on the Internet about fetal weight and pregnancy:
| hot topics | Main content | Discussion popularity |
|---|---|---|
| Fetal weight and mode of delivery | Explore whether cesarean section is necessary if the fetus is too heavy. | high |
| Nutrition during pregnancy and fetal development | How to control fetal weight through diet and avoid macrosomia. | Middle to high |
| Accuracy of Ultrasound Examination | Discuss the error range and influencing factors of fetal weight measurement by ultrasound. | in |
4. How to estimate fetal weight through uterine height and abdominal circumference
For pregnant women who are unable to undergo frequent ultrasound examinations, fetal weight can be estimated by measuring uterine height and abdominal circumference. The following are commonly used clinical estimation methods:
| method | Calculation formula | Things to note |
|---|---|---|
| Gong Gaofa | Fetal weight (g) = uterine height (cm) × abdominal circumference (cm) + 200 | Applicable to the third trimester of pregnancy, the error is about ±15%. |
| Johnson formula | Fetal weight (g) = (uterine height - n) × 155 (n=12, the fetal head has not entered the basin; n=11, the fetal head has entered the basin) | Simple and easy, but less accurate. |
5. Factors affecting fetal weight
Fetal weight is affected by many factors. Understanding these factors can help expectant parents better manage their health during pregnancy:
| factors | influence | Suggestions |
|---|---|---|
| genetic factors | If the parents are larger, the fetus may be heavier. | Monitor regularly and control your diet appropriately. |
| Nutrition during pregnancy | Excessive intake of high-sugar and high-fat foods may lead to macrosomia. | Eat a balanced diet and avoid excessive supplementation. |
| pregnancy complications | Gestational diabetes may increase fetal weight. | Seek medical attention promptly and strictly control your sugar intake. |
6. Summary
There are various ways to calculate fetal weight, with ultrasound examination being the most accurate method, while clinical estimation is more suitable for daily monitoring. Expectant parents should choose the appropriate method under the guidance of a doctor based on their own circumstances. At the same time, pay attention to nutrition and health management during pregnancy to avoid abnormal fetal weight and ensure the safety of mother and baby.
Through the introduction of this article, I hope you will have a clearer understanding of how to know the fetal weight. If you have any questions, it is recommended to consult a professional doctor in time to obtain personalized guidance.
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