What is the meaning of chorionic villus sampling?

What is the meaning of chorionic villus sampling?

Chorionic villus sampling (CVS), or chorionic villus biopsy, is a prenatal test that involves taking a sample of tissue from the placenta to test for chromosomal abnormalities and certain other genetic problems.

What is the process of chorionic villus sampling?

During chorionic villus sampling, a thin tube is guided through the cervix (shown above) or a needle is inserted into the uterus to remove a sample of chorionic villus cells from the placenta. These cells contain a baby’s genetic information.

What are the benefits of chorionic villus sampling?

Chorionic villus sampling is used in prenatal diagnosis, enabling to detect fetal genetic abnormalities. Its advantages include the possibility of performing the procedure during the first trimester of pregnancy relatively fast result, risk of miscarriage comparable to that in case of amniocentesis.

What is the difference between amniocentesis and chorionic villus sampling?

CVS utilizes either a catheter or needle to biopsy placental cells that are derived from the same fertilized egg as the fetus. During amniocentesis, a small sample of the fluid that surrounds the fetus is removed.

Is a CVS painful?

Is CVS painful? CVS is usually described as being uncomfortable, rather than painful. In most cases, an injection of local anaesthetic will be given before transabdominal CVS to numb the area where the needle is inserted, but you may have a sore tummy afterwards.

What does chorionic mean?

1 : of, relating to, or being part of the chorion chorionic villi. 2 : secreted or produced by chorionic or related tissue (as in the placenta or a choriocarcinoma)

Is a CVS test painful?

CVS is usually described as being uncomfortable, rather than painful. In most cases, an injection of local anaesthetic will be given before transabdominal CVS to numb the area where the needle is inserted, but you may have a sore tummy afterwards. Transcervical CVS feels similar to a cervical screening test.

Who performs chorionic villus?

Some women say the vaginal approach feels like a Pap test with some discomfort and a feeling of pressure. There may be a small amount of vaginal bleeding following the procedure. An obstetrician can perform this procedure in about 5 minutes, after preparation.

What diseases can be detected prenatally?

Screening can detect problems such as neural tube defects, chromosome abnormalities, and gene mutations that would lead to genetic disorders and birth defects, such as spina bifida, cleft palate, Downs Syndrome, Tay–Sachs disease, sickle cell anemia, thalassemia, cystic fibrosis, muscular dystrophy, and fragile X …

How long after a CVS can you miscarry?

Most miscarriages that happen after CVS occur within 3 days of the procedure. But in some cases a miscarriage can occur later than this (up to 2 weeks afterwards).

What is the medical definition of chorionic villus sampling?

Medical Definition of chorionic villus sampling. : biopsy of the chorion frondosum through the abdominal wall or by way of the vagina and uterine cervix at 10 to 12 weeks of gestation to obtain fetal cells for the prenatal diagnosis of chromosomal abnormalities —abbreviation CVS.

Are there any side effects to chorionic villus sampling?

Women undergoing chorionic villus sampling may experience no pain at all or feel cramping or pinching. Occasionally, a second sampling procedure must be performed if insufficient villus material was obtained.

When to take a chorionic villus test during pregnancy?

The test can be done as early as 10 weeks of pregnancy. Chorionic villus sampling can reveal whether a baby has a chromosomal condition, such as Down syndrome, as well as other genetic conditions, such as cystic fibrosis.

Can a positive chorionic villus test be false positive?

Occasionally, test results are unclear and amniocentesis — another prenatal diagnostic test — is needed to clarify the diagnosis. With chorionic villus sampling, there’s a rare chance of a false-positive test — when the test is positive, but no disease exists.