How to know if you are infected during sheep biopsy

Amniocentesis is a relatively common examination method. Through this amniocentesis, the baby's physical health can be checked. When doing amniocentesis, it is necessary to strictly follow the operating procedures. Improper operation may lead to infection, which will affect the baby. It can be said that the harm is huge and may cause the baby to suffer from intrauterine hypoxia. At this time, the fetal heart rate and fetal movement can be observed.

How to know if you are infected during sheep biopsy

Amniocentesis is a method of prenatal diagnosis. Generally suitable for prenatal diagnosis in mid-pregnancy. Amniotic fluid exists in the amniotic cavity; the fertilized egg forms the amniotic cavity on the seventh day after fertilization and begins to produce amniotic fluid. The amount of amniotic fluid is 50 ml at 12 weeks of pregnancy, 400 ml at 20 weeks, and 1000-1500 ml at 36-38 weeks. The amount of amniotic fluid decreases slightly as the expected date of delivery approaches.

The best time to draw amniotic fluid for prenatal diagnosis is between 16 and 20 weeks of pregnancy. Because the fetus is small at this time and there is relatively more amniotic fluid, the fetus floats in the amniotic fluid with a wider amniotic fluid belt around it. It is not easy to injure the fetus when the amniotic fluid is extracted with a needle. Extracting 20 ml of amniotic fluid only accounts for 1/20 to 1/12 of the total amniotic fluid, which will not cause the uterine cavity to suddenly shrink and cause miscarriage. Moreover, the proportion of active cells in the amniotic fluid is the largest during this period, and the cell culture survival rate is high. It can be used for slide preparation, staining, fetal chromosome karyotype analysis, chromosome genetic disease diagnosis and gender determination, and amniotic fluid cell DNA can also be used to diagnose genetic and metabolic diseases. By measuring alpha-fetoprotein in amniotic fluid, it is also possible to diagnose open neural tube defects in the fetus. In the late pregnancy, amniocentesis can measure blood type, bilirubin, lecithin, sphingomyelin, placental lactogen, etc., to understand whether there is maternal-fetal blood type incompatibility, hemolysis, fetal lung maturity, skin maturity, placental function, etc.

Amniotic fluid infection means that the uterine cavity is infected with bacteria, which will affect the baby, so you should rush to treat it, or give up. If the baby is about to be born, you can let him come out earlier. Lack of oxygen is also not good for the baby! The baby will be unsafe for a long time! When the fetus is lacking oxygen in the uterus, the anal sphincter will relax and meconium will be discharged to contaminate the amniotic fluid. Once the sample water is found to be contaminated, it indicates that the fetus is suffering from intrauterine hypoxia. Generally, acute hypoxia can often be manifested in fetal heart rate and fetal movement, while chronic hypoxia sometimes has no obvious clinical signs.

Amniocentesis procedure steps

Amniotic fluid examination is best performed during the 15th to 16th week of pregnancy. The steps are as follows:

1. Before formally extracting amniotic fluid, the doctor will first help the pregnant woman to do an ultrasound examination to determine the size of the fetus, the number of weeks of pregnancy, the position of the fetus and the number of fetuses

2. Find the most suitable position for needle insertion

3. Disinfect the skin of pregnant women

4. Place a sterile sheet on the pregnant woman’s belly.

5. Use a 20 or 22 gauge spinal puncture needle under the guidance of ultrasound to gradually insert it into the previously selected amniotic cavity.

6. Make sure the spinal puncture needle is in the amniotic cavity and start to draw out the amniotic fluid with negative pressure.

7. The first 2 ml of amniotic fluid must be discarded (to avoid maternal cell contamination)

8. Draw out about 20 ml of amniotic fluid

9. Put the inner tube of the puncture needle back

10. Withdraw the entire puncture needle

11. Put a bandage on the pinhole on the belly and ask the pregnant woman to sit and rest for 10 minutes outside the amniotic fluid examination room. If there is no discomfort, you can go home!