Tell your doctor of all medications prescribed and over-the-counter and herbal supplements that you are taking. Tell your doctor if you have a history of bleeding disorders or if you are taking any anticoagulant blood-thinning medications, aspirin, or any other medications that may affect blood clotting. It may be necessary for you to stop these medications prior to the procedure. Tell your doctor if you are Rh negative. During the CVS procedure, blood cells from the mother and fetus can mix.
This may lead to Rh sensitization and breaking down of fetal red blood cells. In most cases, prenatal blood tests will have determined whether you are Rh negative. You may be asked to provide these lab results before the procedure.
You may or may not be asked to have a full bladder right before the procedure. Depending on the position of the uterus and placenta, a full or empty bladder may help move the uterus into a better position for the procedure. A CVS procedure may be done on an outpatient basis, or as part of your stay in a hospital. An ultrasound will be performed to check the fetal heart rate, and the position of the placenta, fetus, and umbilical cord.
Based on the location of the placenta, the CVS procedure will be performed through your cervix transcervical or through your abdominal wall transabdominal.
The doctor will insert an instrument called a speculum into your vagina so that he or she can see your cervix. Cells will be gently suctioned through the tube into a syringe. You may feel a twinge or slight cramping. More than one sample may be needed to obtain enough tissue for testing. For an abdominal CVS, your abdomen will be cleansed with an antiseptic. You will be instructed not to touch the sterile area on your abdomen during the procedure.
The doctor may inject a local anesthetic to numb the skin. If a local anesthetic is used, you will feel a needle stick when the anesthetic is injected. In about 1 in every cases, the results of CVS cannot be completely certain that the chromosomes in the fetus are normal. If this happens, it may be necessary to have further tests, such as examining the chromosomes in cells from the parents. It may also be necessary to have amniocentesis an alternative test in which a sample of amniotic fluid is taken from the mother to confirm a diagnosis.
The first result should be available within a few days, and this will tell you whether a major chromosome problem has been discovered. The full results, including smaller, rarer conditions, can take 2 to 3 weeks to come back, although if the test is looking for a specific disorder the results may take up to a month.
This means the baby will not have any of the disorders that were tested for. It is occasionally possible to have a normal result but then the baby is born either with the condition that was tested for or with another genetic condition.
This is because a normal test result cannot exclude every possible genetic disorder. You will then be able to discuss the implications fully.
There is no cure for most chromosomal conditions. Therefore, you need to consider your options carefully. If you are considering termination, talk to your doctor or midwife.
They can give you important information and advice and can refer you to a counsellor if you like. Learn more here about the development and quality assurance of healthdirect content.
InsideRadiology provides free and easily accessible, accurate, up to date and credible information about medical imaging tests and procedures. Read more on InsideRadiology website. Congenital disorder, also known as congenital disease or birth defects, are conditions present from birth. Find out more about congenital disorders. A nuchal translucency scan is part of the ultrasound scan that may give an indication of chromosomal abnormality.
Learn more about how and when it is performed. Down syndrome causes intellectual disability and other challenges. Early intervention can help children with Down syndrome reach their full potential. Read more on raisingchildren. Because a certain percentage of women will end up miscarrying at this point in pregnancy anyway, there's no way of knowing for sure whether a miscarriage following CVS was actually caused by the procedure.
Your particular risk depends in large part on the skill and experience of the doctor performing the procedure. Some older studies found that CVS may have caused defects in a baby's limbs, but this was mostly seen in tests done on women before 9 weeks of pregnancy.
Current research suggests that there is no increased risk for this problem in women who have CVS at 10 weeks or later. This greatly increases the chances that the doctor will be able to obtain enough tissue on the first try, so you won't have to repeat the procedure. In fact, most testing centers require that you meet with a genetic counselor to discuss the risks and benefits of various methods of prenatal screening and testing before you have an invasive procedure like CVS or amniocentesis.
The counselor will take down your family history and ask questions about your pregnancy. Your answers will enable the counselor to give you a sense of your risk for having a baby with chromosomal problems or a particular genetic disease. Then you can decide whether you want to be screened, go right for CVS or amnio, or forgo testing altogether. The American College of Obstetricians and Gynecologists recommends that women of all ages be offered genetic screening and diagnostic testing options.
Your practitioner or genetic counselor should discuss the pros and cons of the available approaches with you. But ultimately, whether or not to test is a personal decision. Some women decide to forgo all screening and testing because the results are not going to influence the management of their pregnancy.
They would never terminate the pregnancy if a serious problem were found. Some women are not willing to take even a very small risk of miscarriage in order to find out the results of diagnostic testing.
Many women opt for screening and then make a decision about diagnostic testing based on the initial results. If you opt for screening first, you can then decide — with the help of your practitioner or genetic counselor — whether your results indicate a high enough risk that you want to have CVS or amnio to determine whether a problem exists.
Some women opt for diagnostic testing after screening, and some choose diagnostic testing right away. Women who choose diagnostic testing right away may know that they're at high risk for a chromosomal problem or a condition that can't be detected by screening — or they may just feel that they want to know as much as possible about their baby's condition and are willing to live with the small risk of miscarriage to find out.
There are even a few conditions that may be treated while the baby is still in the womb. So, if there's a strong suspicion that your baby may have one of these rare problems, you might opt for CVS to find out.
Some women who opt for invasive testing are pretty clear in advance that they would terminate the pregnancy if a serious problem were found. Others feel that finding out that their baby will have special needs will help them prepare emotionally for the challenges ahead. In certain cases, they may want to switch to a better-equipped hospital with specialists.
There's no one right decision. Individual parents-to-be have different feelings about what risks are acceptable and may arrive at different conclusions when facing the same set of circumstances. Both tests can tell you whether your baby has a chromosomal problem or certain genetic disorders. Considerations include:. CVS is done earlier in pregnancy as early as 10 weeks , so you can find out sooner about your baby's condition. If everything's okay, your mind will be put at ease that much sooner.
Or, if there is a serious problem and you opt to terminate the pregnancy, you'll be able to do so while you're still in the first trimester. On the other hand, you may prefer to wait for the results from your second-trimester anatomy ultrasound before subjecting yourself to an invasive test. At that point, amniocentesis would be your only option. For example, if noninvasive prenatal testing NIPT suggests you're at high risk for having a baby with Down syndrome, you may want to wait to see if there's an abnormal second-trimester anatomy ultrasound.
If that shows an abnormality, you might decide to have amniocentesis. I want to know if my baby has a birth defect so I have time to decide if I want to continue my pregnancy. Knowing that my baby has a birth defect won't change my plans to carry my baby to term. Now that you've thought about the facts and your feelings, you may have a general idea of where you stand on this decision.
Show which way you are leaning right now. How sure do you feel right now about your decision? Here's a record of your answers. You can use it to talk with your doctor or loved ones about your decision. I'm not afraid of the needle or catheter that is used to do the test.
I don't have insurance, and I can't afford to pay for the test myself. Can a CVS test guarantee that your baby will be born healthy? Are you clear about which benefits and side effects matter most to you? Do you have enough support and advice from others to make a choice?
Author: Healthwise Staff. This information does not replace the advice of a doctor. Healthwise, Incorporated, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content. To learn more about Healthwise, visit Healthwise. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated. Updated visitor guidelines. Get the facts.
Your options Have CVS chorionic villus sampling. Don't have CVS. Key points to remember CVS is done in the first trimester. If the test shows a serious health problem, you have more time to decide whether you want to continue your pregnancy or make plans to care for a sick child.
CVS isn't a routine test. But your doctor may recommend it if your chances of having a baby with a genetic condition or birth defect are higher than average. Even though CVS can find certain problems, it can't guarantee that your baby will be born healthy.
CVS has some risks, including a small chance of causing a miscarriage. What is CVS? What information can CVS provide? Chorionic villus sampling can tell you if your baby may be at risk for having: A genetic condition, such as Down syndrome.
A disease that can run in families, such as Tay-Sachs disease or hemophilia. How is CVS done? Chorionic villi cells can be collected in one of two ways. During the test, your doctor may: Put a thin, flexible tube called a catheter through your vagina and cervix into the placenta. This is called transcervical CVS. Put a long, thin needle through your belly into the placenta. This is called transabdominal CVS. The doctor uses ultrasound to guide the catheter or needle to the right spot.
What are the benefits of having CVS? What are the risks of CVS? In studies of women who had CVS performed by a highly trained doctor, about 1 out of women had a miscarriage after the test, while did not.
There is a chance that you could get an infection in your uterus. There is a very small chance that you could bleed during the test. If this happens, your blood may mix with your baby's blood.
This is only a problem if your blood is Rh-negative and your baby's is Rh-positive, because you could have an immune system response called Rh sensitization. If you're at risk for Rh sensitization, you'll be given a vaccine to prevent it.
0コメント