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Scans & Tests
Updated on 2 November 2022
Downs Syndrome is a birth disorder. The chromosomal arrangement that causes this syndrome takes shape at the time of conception itself.
When the genetic material from the egg and the sperm fuses together at conception, it forms bundles, which we call chromosomes. People with Down’s syndrome get an extra chromosome, which in turn affects their complete body.
People with Downs Syndrome face mild to severe learning difficulties and an array of health problems. Read on to find out more on this below.
According to researchers, one in every 1,000 babies in India is born with Downs Syndrome.
This chromosomal abnormality is very common and has long-term impact on the complete family. It is therefore, important that timely screening for this disorder is done during pregnancy, especially if the mother-to-be is over 35 years of age.
Screening and timely detection of the disorder enables families to make an informed choice about the way forward with the pregnancy. They can be given counseling so that the decision to keep or terminate the pregnancy can be taken without any guilt, based on their circumstances and personal abilities.
Tests to screen for Downs Syndrome are carried out on high-risk women in different stages. Some tests take place between the 10th to the 14th week of gestation while others are done in the 20th week of pregnancy.
Some common screening tests for Downs Syndrome include –
Tests such as ultrasounds and blood tests only tell you the risk of having a baby with a birth disorder.
More confirmed results come from diagnostic tests. These are –
The following are the screening tests performed in the first trimester between the 10th to the 13th weeks of gestation.
It is an ultrasound done to detect and measure the fluid accumulation at the back of the baby's neck. Excessive fluid indicates high risk of Downs Syndrome.
It is done to find out the levels of hCG and Pregnancy Associated Plasma Protein (PAPP-A) in the pregnant woman’s blood. Incase a woman has conceived a baby who has Down's syndrome, the hCG levels come out very high while the PAPP-A levels in the blood are very low.
It is advantageous to get first trimester screening done. This is because, if the test results indicate the risk of your baby being born with Downs Syndrome, you can immediately proceed to get diagnostic tests done to get a confirmed report.
Alternatively, you can wait and get another round of screening tests done in the second trimester. However, this is usually not advised, as termination of pregnancy gets difficult and risky in the later stages.
High cost of the NT and Double marker tests is the only disadvantage of the first trimester screening tests. These tests work out to be very expensive.
Downs Syndrome screening in the second trimester involves blood tests. The tests are done between the 15th to 21st weeks of gestation. They aim to measure different markers in the blood of the pregnant woman to determine her risk of delivering a baby with Downs Syndrome.
There are three variations of blood tests available in India. These are –
The reports from a triple or quadruple screening test are made available within two weeks.
Most doctors suggest women to opt for integrated tests including the NT scan as well as the Triple Marker blood test for best and clear results. Incase detected with a baby with Down’s syndrome, it is the parent’s choice whether to proceed with the pregnancy or not. The decision is not an easy one either way. That is why there are support groups and counseling available to help one make an informed choice. It is helpful to talk to parents who have children with Downs Syndrome, as they understand what you are experiencing.
Caring for a baby with Downs Syndrome is a life long commitment and parents must be aware of what it entails. Even though you must treat the child as any normal baby, you must know that every baby with this disorder is different, with different health and developmental issues.
Babies with Downs Syndrome are most likely to have –
Early intervention, support, counseling, and therapy go a long way in managing children with Downs Syndrome positively. It is best to consult your doctor to know more about such resources available.
References:
1. Shiefa S, Amargandhi M, Bhupendra J, Moulali S, Kristine T. (2013). First Trimester Maternal Serum Screening Using Biochemical Markers PAPP-A and Free β-hCG for Down Syndrome, Patau Syndrome and Edward Syndrome. NCBI
2. Manikandan K, Seshadri S. (2017). Down Syndrome Screening in India: Are We There Yet?. NCBI
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Written by
Ravish Goyal
Official account of Mylo Editor
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