There are five major ultrasounds during pregnancy. When should expectant mothers do B-ultrasound, and what are the contents of these five B-ultrasounds?Listen to me.
First ultrasound (7-8 weeks after menstruation).
There are five main aspects of early pregnancy ultrasound:
1.Look at the embryo position. Whether it is an intrauterine pregnancy or an ectopic pregnancy. If the pregnant woman's last child was delivered by cesarean section, it also depends on the relationship between the embryo and the cesarean section scar;
2.Look at the number of embryos. If it is twin or multiple, it also depends on chorionicillus;
3.See if the embryo has a fetal heartbeat;
4.See if the size of the embryo is in line with the gestational age. For women with irregular menstruation or inability to remember the last menstrual period, the gestational age should be calculated according to the fetal bud length indicated by ultrasound;
5.Look at the uterus and appendages. During the first trimester, if a pregnant woman has **bleeding or abdominal pain, the doctor may need to recommend a repeat ultrasound, depending on the condition.
Second ultrasound (11-13+6 weeks of menopause).
1.The most important purpose of the second ultrasound is to measure the fetal NT value. NT refers to the thickness of the transparent layer of the posterior nuchal nuchal of the fetus, and the normal value is 25mm。Thickening of the NT suggests a chromosomal abnormality in the fetus.
2.Check the gestational age again according to the diameter of the baby's head and hips.
3.Look at the placenta and amniotic fluid. Early detection of certain severe cranial malformations is an initial morphological examination.
4.In the case of twins, the twin's chorionic nature is determined again.
5.Uterine and adnexal mass is excluded.
Third ultrasound (20-24 weeks of menstruation).
This is the most important ultrasound examination in the second trimester, and the main purpose is to screen for fetal malformations, evaluate fetal development, and also check the placenta, umbilical cord and amniotic fluid. Deformity ultrasound requires the sonographer to take images of nearly 30 sections of the fetus and appendages. If the screening reveals abnormalities, the sonographer will arrange for a referral to a prenatal diagnostic facility for further investigation.
Due to the limitations of medical technology conditions and the influence of maternal fetal factors (such as too thick maternal abdominal wall, less amniotic fluid, fetal position, posture, fetal movement, limb occlusion, etc.), there are limitations in ultrasound for deformity, and all fetal malformations cannot be found.
Fourth ultrasound (28-32 weeks of menopause).
This is the second ultrasound of deformity and can be used as a supplement to the screening of fetal anomalies during the second trimester. The ultrasound also measures the fetal diameters to assess fetal development. Remind obstetricians to detect problems early and intervene. This ultrasound is also important for the examination of fetal appendages, which can help us detect problems such as placenta previa, umbilical cord abnormalities, and abnormal amniotic fluid volume.
Fifth ultrasound (around 37 weeks of menopause).
The main purpose of this ultrasound is to evaluate fetal growth and development to assist in estimating fetal weight and assessing the mode of delivery, and does not involve examination of fetal structure. At the same time, pay attention to placenta, amniotic fluid, umbilical cord and other issues. Healthy Wintering Program