Cvs test how is it performed

Chorionic villus sampling can't detect certain birth defects, such as neural tube defects. If neural tube defects are a concern, an ultrasound or genetic amniocentesis might be recommended instead. Your health care provider might caution against transcervical chorionic villus sampling — which is done through the vagina — if you have:.

Rarely, your health care provider might caution against transabdominal chorionic villus sampling — which is done through the abdominal wall — if:. Rh sensitization. Chorionic villus sampling might cause some of the baby's blood cells to enter your bloodstream. If you have Rh negative blood and you haven't developed antibodies to Rh positive blood, you'll be given an injection of a blood product called Rh immune globulin after chorionic villus sampling.

This will prevent your body from producing Rh antibodies that can cross the placenta and damage the baby's red blood cells. A blood test can detect if you've begun to produce antibodies.

Some older studies suggested that chorionic villus sampling might cause defects in a baby's fingers or toes. However, the risk appears to be a concern only if the procedure is done before week 10 of pregnancy. You might need to have a full bladder for chorionic villus sampling. Check with your provider about how much fluid you might need to drink, as well as any other pre-test preparation that might be necessary before your appointment.

Your health care provider will explain the procedure and ask you to sign a consent form before the procedure begins. Consider asking someone to accompany you to the appointment for emotional support or to drive you home afterward.

Chorionic villus sampling is usually done in an outpatient facility or the health care provider's office. First, your health care provider will use ultrasound to verify your baby's gestational age and the position of the placenta.

You'll lie on your back on an exam table with your abdomen exposed. After the sample is taken, the doctor may check the fetus' heart rate.

You should rest for several hours after the test. Results are usually available within a few hours to a couple of days, depending on what the test is being used to look for. Reviewed by: Armando Fuentes, MD. Larger text size Large text size Regular text size.

But your health care provider may recommend this test if you: are older than age 35 have a family history of genetic disorders or a partner who does have a previous child with a genetic disorder or had a previous pregnancy with a chromosomal abnormality have had an earlier screening test that indicates that there may be a concern What Happens During CVS?

The site is injected with local anaesthetic. A slender needle, guided by ultrasound, is inserted through your abdomen wall until it reaches the edge of the placenta. The needle is nowhere near the amniotic sac or the baby at any stage. This takes about two minutes or so. You may feel a strange dragging or drawing sensation in your pelvis or legs - this is normal, and no cause for alarm.

It may be necessary to take a second sample. Once the sample is taken, the needles are removed. The baby is checked using the ultrasound scan. You are then free to get dressed. Generally, you can expect to be at the clinic for up to 90 minutes. Immediately after chorionic villus sampling You may be asked to wait half an hour or so before leaving the clinic, just to make sure that both you and your baby are all right. It may be best if someone else drives you home, especially if you were given drugs during the test.

The placental sample is sent to a laboratory and cultured. When enough cells have grown, the chromosomes are individually tested to make sure the number, appearance and size are correct. The results are usually sent to your doctor within a few weeks, so make sure you arrange for a follow-up appointment.

Self-care after CVS Be guided by your doctor, but general suggestions include: Get plenty of rest for the remainder of the day. Avoid hard physical activity, such as lifting heavy objects. You should be able to go about your normal business in the next day or so. 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. By week 12, your baby is the size of a plum but fully formed, with their organs, muscles, limbs and bones in place. At week 13 of pregnancy, you officially enter your second trimester and hopefully any morning sickness has eased off.

Find out what being Rhesus D negative could mean for your baby and how it is treated. Genetic counselling may be recommended for people who have a history of hereditary disorders.