Chorionic Villi Sampling (CVS)

What is chorionic villi sampling 

Chorionic Villi Sampling (CVS) is a test that gives a complete picture of the genetic makeup of the developing foots.  This procedure involves taking a sample of the chorion, a membrane surrounding the foetus, either via the vagina and cervix, or through a needle inserted in the abdominal wall. Since the sample is taken directly from the foetus, its examination can help in identifying any defects in the baby.  

Which diseases can be identified with CVS

CVS is useful in detecting disorders like Tay-Sachs, sickle-cell anaemia, most types of cystic fibrosis, the thalassaemias, and Down’s syndrome.   

What are the advantages of CVS over amniocentesis

The advantage of CVS over amniocentesis is that it can be performed as early as the tenth week of pregnancy and gives results within one or two weeks. Thus, doctors can identify genetic defects earlier on in the pregnancy. Amniocentesis can only be conducted around the 16th week of pregnancy. The results of CVS are also available earlier and sometimes, CVS can be performed when there is not enough amniotic fluid.

Hepatitis B Test

Is the hepatitis B test necessary

Unlike hepatitis A, this strain can be passed on to the foetus during childbirth. Nine out of ten infected babies, if left untreated, become chronic carriers and are at a risk of developing a more serious liver disease.   

When should the hepatitis B test be taken

This disease is generally tested in the fifth month of pregnancy.  If the test results indicate that you do have hepatitis B, it is possible for your doctors to treat your baby right at birth, so that future complications are prevented.

Sonography (ultrasound)

How is sonography (ultrasound) helpful

An ultrasound scan gives a picture of the baby in the mother’s womb without using X-rays.  It is used to check the baby’s development. By using sound waves, birth defects can be identified by the 16-18 week of gestations and sometimes even earlier.   

When is an ultrasound recommended

Most doctors, these days, advise 3-4 routine sonography tests: first test around the 6th week of pregnancy, second test around the 19th week, third one in the 7th month; and the fourth test in the 37th week.  In addition to birth defects, it also helps in identifying twins (or multiple births), and position of the baby and placenta closer to the due date. 
                           
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