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【Yun Fu Mei】 Obstetric examination in may (17-20 weeks) of pregnancy

If you don't miss the test in the first 4 months, you will have a calm and relaxing 5 months of pregnancy. However, from this month on, expectant mothers will obviously feel the presence of the fetal baby.

Amniocentesis is appropriate this month: Amniocentesis is a commonly used prenatal diagnostic procedure. The fetus is small, there is more amniotic fluid, and under the guidance of the B ultrasound, it will not stab the fetal baby, and the expectant mother's abdomen will not leave scars.

First, 16-20 weeks of pregnancy is suitable for amniocentesis

The best time to do amniocentesis is 16-20 weeks' gestation. Because this time the fetus is small, the amniotic fluid is relatively more, the fetal baby floats in the amniotic fluid, there is a wide band of amniotic fluid around, and it is not easy to stab the fetal baby when the amniotic fluid is extracted with a needle puncture. Moreover, the proportion of viable cells in amniotic fluid during this period is the largest, the survival rate of cell culture is high, and it can be used for filming, dyeing, fetal karyotype analysis, chromosomal genetic disease diagnosis and sex determination, and can also be used to diagnose genetic diseases and metabolic diseases by amniotic fluid cell DNA, and can also diagnose fetal baby open neural tube malformations.

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amniocentesis

Amniocentesis is commonly used to confirm chromosomal diseases and to determine certain genetic disorders. Under the guidance of ultrasound B, the needle is pierced into the uterine cavity through the abdominal wall of the expectant mother, about 20 ml of amniotic fluid sample is taken out, and then the karyotype of the chromosome is obtained through 7 to 14 days of cultivation, and then the fetal baby is judged whether the fetus is a Down child or whether there are other chromosomal abnormalities by observing and analyzing the chromosomes.

【Yun Fu Mei】 Obstetric examination in may (17-20 weeks) of pregnancy

Second, amniocentesis does not use anesthetics

Most expectant mothers will only feel a slight pain when they are just stabbed, similar to the pain of pricking a finger to take blood, which is bearable. However, there is no need to worry about causing harm to the fetal baby, in this process, the doctor will carefully avoid the fetal baby under B ultrasound monitoring. Because of the lack of anesthesia, some expectant mothers may feel a little tightness in the abdomen during amniocentesis, or a tingling or pressure sensation, while some expectant mothers may not feel any discomfort, and whether they feel pain varies from person to person.

Third, which expectant mothers need to have amniocentesis

Not all expectant mothers need to have an amniocentesis, and if you have any of the following conditions, consider whether to do amniocentesis: advanced maternal age over 35 years old; having had a defective baby; having a history of birth defects in the family; ultrasonography finding an abnormal pellucida or other abnormality in the neck of the fetus; and a high-risk Down screening result, doctors will also recommend amniocentesis. Although the risk of amniocentesis is small, there is still a certain risk, and it is necessary to go to a regular large hospital.

4. Will amniocentesis stab the fetus?

Amniocentesis is suitable for expectant mothers of 16-20 weeks, and some expectant mothers are worried that amniocentesis will hurt the fetus. In fact, when doing amniocentesis, the fetus is not very large, there is plenty of amniotic fluid surrounded, puncture with a needle through the abdominal wall of the expectant mother, pierce into the uterine cavity to suck out a little amniotic fluid, will not stab the baby, and the needle eye is almost invisible. Both the right mother and the fetus are very safe, and there is no need to worry about scars after punctures.

5. Do you need to be hospitalized after amniocentesis?

Sheep belly puncture surgery generally does not require hospitalization, and expectant mothers should sit still for at least 2 hours after examination before returning home. Expectant mothers who are far from home are best to rest for one night in a hotel near the hospital and go home after the next day to avoid overwork after the operation. The results of amniocentesis are slower because cell culture is usually at least half a month or so.

Bathing cannot be taken on the day after amniocentesis. After the operation, go home to rest, rest more, and pay attention not to be too tired or carry heavy objects. You can't have sex immediately after surgery, and it's best to consider it half a month later. In addition, there may be pain in the place where the needle is inserted, and some expectant mothers may have symptoms of vaginal bleeding, which will disappear as long as they rest for a few more days, and do not need to take medication. However, if you have abdominal pain, bloating, vaginal bleeding or running water, or fever within 3 days after the amniocentesis, you must go to the hospital in time.

6. Non-invasive DNA prenatal testing

In addition to amniocentesis, the techniques for prenatal diagnosis include noninvasive DNA prenatal testing. Non-invasive DNA prenatal detection technology is to collect the venous blood of the expectant mother, use the new generation of DNA sequencing technology to sequence the free DNA fragments (including free DNA of the fetus) in the maternal peripheral plasma, analyze the baby's chromosomal condition, so as to detect whether the fetus has three major chromosomal diseases of trisomy 21 (Down syndrome), trisomy 18 (Edwards syndrome), and trisomy 13 (Partau syndrome).

The accuracy rate of non-invasive DNA prenatal examination can reach more than 99%, and is currently suitable for expectant mothers such as virus carriers, placenta previa, oligohydramnios, miscarriage history, threatened miscarriage or precious children who are not suitable for invasive prenatal diagnosis or have psychological impairments to prenatal diagnosis. The noninvasive DNA prenatal testing sampling method is simple, does not require long appointments and queues, and only takes about 1 week to produce results, which is conducive to early pregnancy intervention.

7. Comparison of Down's screening, amniotic fluid examination, and non-invasive DNA prenatal testing

Source: Concordia Expert Encyclopedia of Pregnancy and Maternity

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It mainly contains: calcium, iron, zinc, selenium in minerals and VA, VC, VD, VB1, VB2, VB6, VB9 (folic acid), VB12, VE and niacinamide in vitamins.

1. The perfect combination of gold

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【Yun Fu Mei】 Obstetric examination in may (17-20 weeks) of pregnancy

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- 2022.05.10-

The above pictures are partly from the Internet, if it involves copyright issues, please contact us to delete; the article originates from concord experts "Encyclopedia of Pregnancy and Obstetrics" for reference and learning to share, if it involves copyright issues, please contact us to delete!

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