Prenatal Test: Chorionic Villus Sampling (CVS)enparents chorionic villus sampling (CVS) checks cells from the placenta for chromosomal abnormalities. Most women whose pregnancies are not high-risk don't need this test.prenatal tests, screen, screening, exam, pelvic, villus, villi, uterus, vagina, cervix, cervical test, pap smear, fetus, embryo, baby, urine tests, blood test, ultrasound, Chorionic Villus Sampling (CVS), combined first trimester screening, integrated screening, serum integrated screening, screening for fetal abnormalities, birth defects, down syndrome, trisomy, heart defect, neural tube defect, tay-sachs, blood disease, SMA, HIV, spina bifida, CP, cystic fibrosis, cerebral palsy, genetic disorder, defect, diabetes, preeclampsia01/22/201808/08/201809/02/2019Armando Fuentes, MD08/02/2018ad2a2ff6-d1a0-415b-9d7d-acef9bedc8d3<h3>What Is Chorionic Villus Sampling (CVS)?</h3> <p>A chorionic villus sampling <a href="">prenatal</a> test checks cells from the placenta (which are identical to cells from the fetus) to see if they have a chromosomal abnormality (such as <a href="">Down syndrome</a>).</p> <p>A CVS can be done from weeks 10 to 13 in a woman's pregnancy. It's a diagnostic test rather than a screening test. That means that it can tell for sure whether a baby will be born with a specific chromosomal disorder.</p> <h3>Why Is Chorionic Villus Sampling Done?</h3> <p style="font-size: 12px;">This test is offered to all pregnant women, but in particular those whose babies are at higher risk for a chromosomal abnormality. These include pregnant women who are older, already have a baby with a chromosomal disorder, or have had an abnormal screening test.</p> <p style="font-size: 12px;">The CVS is considered an alternative to an <a href="">amniocentesis</a> because it can be done earlier in pregnancy, giving expectant parents more time to receive counseling and make decisions. Unlike amniocentesis, CVS does not provide information on neural tube defects like <a href="">spina bifida</a>. The risks of CVS are higher than with amniocentesis, so the risks and benefits of the test must be weighed.</p> <h3>Should I Have a CVS?</h3> <p style="font-size: 12px;">Most pregnant women who are not high risk will not need this test. But your health care provider may recommend this test if you:</p> <ul> <li>are older than age 35</li> <li>have a family history of genetic disorders (or a partner who does)</li> <li>have a previous child with a genetic disorder or had a previous pregnancy with a chromosomal abnormality</li> <li>have had an earlier screening test that indicates that there may be a concern</li> </ul> <h3>What Happens During CVS?</h3> <p>Chorionic villi are tiny finger-like units in the placenta (which provides nutrients from the mother to the fetus through the umbilical cord). They have the same chromosomes and genetic makeup as the fetus.</p> <p>During a CVS, some cells from the chorionic villi are removed and tested for chromosomal abnormalities such as&nbsp;<a href="">Down syndrome</a>, <a href="">Tay-Sachs disease</a>, and&nbsp;<a href="">fragile X syndrome</a>.</p> <p>This test can be done two ways:</p> <ul class="kh_longline_list"> <li><strong>Transcervical:</strong> Using <a href="">ultrasound</a> as a guide, a thin tube is passed from the vagina into the cervix. Gentle suction removes a sample of tissue from the chorionic villi.</li> <li><strong>Transabdominal:</strong> A needle is inserted through the abdominal wall with ultrasound guidance and a sample of the chorionic villi is removed.</li> </ul> <p>Some women find that CVS is painless. Others feel cramping, similar to period cramps, while the sample is taken. After the sample is taken, the doctor may check the fetus' heart rate. You should rest for several hours after the test.</p> <p style="font-size: 12px;">Possible risks of this test include:</p> <ul> <li>about a 1% risk of&nbsp;<a href="">miscarriage</a>&nbsp;(the risk is higher with the transcervical method than with the transabdominal method)</li> <li>infection</li> <li>spotting or bleeding (this is more common with the transcervical method)</li> <li>birth defects when the test is done too early in pregnancy</li> </ul> <h3>When Is CVS Done?</h3> <p>Chorionic villus sampling testing is done at 10 to 13 weeks.</p> <h3>When Are the Results Available?</h3> <p>Results are usually available within a few hours to a couple of days, depending on what the test is being used to look for.</p>Examen prenatal: Muestra del vello coriónicoUna muestra del vello coriónico prenatal examina las células de la placenta (que son idénticas a las del feto) para ver si hay alguna anomalía cromosómica (como síndrome de Down).
Birth DefectsSome birth defects are minor and cause no problems; others cause major disabilities. Learn about the different types of birth defects, and how to help prevent them.
Medical Care During PregnancyThe sooner in pregnancy good care begins, the better for the health of both moms and their babies. Here's what to expect.
Prenatal Genetic CounselingGenetic counselors work with people who are either planning to have a baby or are pregnant to determine whether they carry the genes for certain inherited disorders. Find out more.
Prenatal Test: First Trimester ScreeningThe first trimester screening (or first trimester screen) includes a blood test and an ultrasound exam. It's done to see if a fetus is at risk for a chromosomal abnormality or birth defect.
Prenatal Test: UltrasoundA prenatal ultrasound is a safe and painless test that shows a baby's shape and position. It can be done in the first, second, or third trimester of pregnancy.
Prenatal Tests: FAQsEvery parent-to-be hopes for a healthy baby, but it can be hard not to worry. Find out what tests can keep you informed of your health — and your baby's — throughout pregnancy.
Prenatal Tests: First TrimesterFind out what tests may be offered to you during the first trimester of pregnancy.
Prenatal Tests: Second TrimesterFind out what tests may be offered to you during weeks 13 through 26 of pregnancy.
Prenatal Tests: Third TrimesterFind out what tests may be offered to you during weeks 27 through 40 of pregnancy.
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