What data does the first trimester B-ultrasound list mainly look at? 1, the baby's head and buttocks are long.
At the beginning of pregnancy, the baby is generally about 5 cm long and the body is curled up in the uterus. It is difficult to measure the length of a baby. Therefore, people generally choose to measure the baby's head and hip length. Head-hip length refers to the distance from the top of the baby's head to the bottom of the baby's hip.
The standard data of normal head and hip length are as follows:
2 months pregnant: (3.27 cm to 4. 14 cm)
3 months pregnant: (4.3 cm to 5.29 cm)
4 months pregnant: (5.47 cm to 6.59 cm)
5 months pregnant: (6.78 cm to 8.02 cm)
The calculation formula of gestational age is: gestational age =CRL+6.5. If the head-arm diameter of the B-ultrasound data sheet is 6.03 cm, then the gestational age of the baby is 6.03+6.5 = 12.53 weeks.
2, the baby's NT check value
NT examination refers to the thickness of the transparent layer of the baby's neck at the gap position. Under normal circumstances, it should be transparent here, because this is the effusion produced by the baby's metabolism, which is a kind of protection for the baby.
The purpose of NT examination is to diagnose whether the baby has chromosomal diseases, such as fetal abnormalities such as 2 1 trisomy syndrome in early pregnancy, and it is an early examination to rule out whether the baby is developing normally.
NT examination is generally done in pregnant women who are about 3 months pregnant. The normal thickness of baby NT is less than 3 mm. If the NT test results show that the thickness is greater than 3 mm, it will warn us that the fetal development may not be so healthy. In the inspection report, it will generally show whether the fetus' chromosome is abnormal, whether the fetus is healthy or not.
Pregnant women will also do Down's screening in the later period to check whether the baby is developing well, and doctors will also pay attention to it. If necessary, pregnant women can do more tests to make a comprehensive judgment, such as non-invasive DNA examination, amniocentesis examination, fetal chromosome examination and so on.
Besides, what other important data are there? 1, the baby's fetal heart rate
The normal range of the baby's fetal heart rate is 120 to 160 times per minute. If the baby's heartbeat is too fast or too slow, it is abnormal and needs further examination. But the baby's slow heartbeat may also be because the baby is sleeping. Check again in a few days to make sure.
2. AMN in uterus
The amount of amniotic fluid directly affects the safety of the baby. Doctors usually determine the amount of amniotic fluid by measuring the depth of amniotic fluid.
The normal range of amniotic fluid depth is 3-8cm. It is abnormal for amniotic fluid to be slightly higher or lower than the normal range, so mother should pay attention. In the case of little amniotic fluid, the doctor will advise the mother to replenish water and drink about 2000ml of boiled water every day. If there is less amniotic fluid caused by non-water shortage, you need a doctor's outside help to return to normal.
3. Length of fetal head and femur
When doctors measure a baby's head, they usually measure multiple sets of data. In order to avoid some errors, the median value of the data is generally taken. If the baby's full-term head is less than or equal to 10cm, the delivery will be better.
In addition to the head circumference, we should also measure the leg length of the fetus. The doctor will roughly predict the baby's current weight according to the head circumference and leg length. If the baby is not up to standard, it is necessary to strengthen nutrition. However, due to manual measurement, there will be a certain small error and little impact.
4. Placental maturity
From the ninth month of pregnancy, expectant mothers will check again, and new data of placental grading will appear on the checklist. Placenta can be divided into 0-3 grades. Placenta in the first trimester of pregnancy is grade 0; The basic maturity of placenta is 1 grade; Placenta mature, showing grade 2; If the placenta shows grade 3, it means that it has entered the old age, indicating that the melon should be mature.
Generally, after nine months of pregnancy, the placenta has matured and its function is gradually weakened. The sooner the baby gives birth, the better, otherwise the waste produced by the baby's placenta will affect the baby's health.
Women insist on abdominal ultrasound scanning
5. Umbilical cord
The umbilical cord is like a bridge, with one end connected to the placenta and the other end connected to the baby. Under normal circumstances, umbilical cord floats in amniotic fluid like aquatic plants. If the umbilical cord is found in the baby's neck, it may be the umbilical cord around the neck, and caesarean section may be needed, otherwise it will endanger the baby's life.
The umbilical cord around the neck is only a temporary phenomenon, and the baby keeps tossing and turning in the mother's stomach. It is possible that a little exercise will be normal again, so don't worry too much.
The process of pregnancy is beautiful. Although there are many places that need mom's attention, don't worry too much. Do a good job of prenatal examination, and you can communicate with the doctor at any time if you don't understand. Pay attention to diet and rest, don't stay up late, stay away from harmful substances and radiation. As long as the mother does this during pregnancy, the baby will grow up healthily.