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a. Screening tests
Determine the risk of the baby. He cannot say for sure that the baby has a problem, but it may indicate that further testing is required. All pregnant women, regardless of age and family history, may choose these screening tests.
• Measurement of nuchal translucency (with or without early pregnancy test in maternal blood)
• Maternal blood test
b. Prenatal diagnostic tests
Determines whether a baby has a particular chromosomal abnormality or not. However, even if the test result is normal, your baby may have other problems. Diagnostic methods are as follows.
• Chorionic vilus sampling
When these tests are performed. Each test is 8-10. starting at the gestational week, including the 20th gestational week.
Guidance with prenatal tests
Interview is recommended before screening or diagnostic test. In this meeting, the following are discussed.
• How and when tests are performed
• Advantages and disadvantages of tests
• The risk the test shows to the baby
• Other tests to be offered to you after receiving the result
Before the test, you can decide which test to take and decide which one is best for you and your baby. If an increased risk of chromosome problems is detected in your baby after a prenatal screening test, or if a problem is detected after a diagnostic test, the following will be discussed at the interview.
• What does it mean to you and your family testing
• Options we can offer you
• Would you consider taking further tests
• Movements you will make
• What is your approach to people with disabilities
• What is your approach to termination of pregnancy
Chorionic vilus sampling
It is usually done between 11-13 weeks of pregnancy. An ultrasound guided fine needle is inserted through the abdominal wall into the placenta and a small amount of tissue sample is taken. Sometimes it is difficult to reach the placenta from the abdomen and it may need to be done through the vagina. The procedure is similar to a smear test. A thin catheter is advanced through the cervix into the placenta. The baby and placenta come from the same cells, so they share the same chromosomes. The test error rate is less than 1/4000.
The risk of miscarriage after this procedure is 0.5% (1/200). The probability of spontaneous abortion at this week of pregnancy is 2% (1/50).
It is usually done at 16-18 weeks of gestation. An ultrasound guided needle is inserted through the abdominal wall into the amniotic fluid surrounding the baby. A small amount of liquid is drawn. The amniotic fluid contains infant and water sac membrane. Chromosome testing results in 14 days. The test error rate is less than 1/10000.
The risk of miscarriage after this procedure is 0.33% (1/300).
• Used in screening or diagnostic testing
• Used to control the health of your baby and is used to follow the course of pregnancy is not a problem
• Can be done in every period of your pregnancy
• Advanced tests may be required after ultrasound
• No harm to your baby
Why is ultrasound performed?
• Determine how many weeks you are pregnant
• Determining the placement of the placenta (spouse, end of the baby)
• To determine if there is more than one baby in the uterus
• Evaluating the baby's growth and physical development
• To control pregnancy when complications occur
• Evaluate the baby's development in case of doubt in the previous examination
• To be able to control the condition that can be diagnosed by ultrasound in an infant with increased risk
• Determine whether the baby is at increased risk of chromosomal problems
• Getting a clear image of the baby while performing diagnostic tests
• Evaluate the development of the baby's spine if the baby has an increased risk of neural defects after the mother's serum test
When is the ultrasound performed?
• Can be done at any time of pregnancy
• To determine the time of pregnancy and the number of babies 8-12. between weeks of gestation
• Nuchal thickness is performed between 11.5 and 13.5 weeks of gestation during screening test
• The best time to assess the baby's physical development is 18-20 weeks of gestation.