Prenatal Screening in Chennai: Tests, Timing, Results & What Happens Next
Updated: Aug 24
Pregnancy involves several important health checks to monitor the development of your baby. One of these is prenatal screening, which can help estimate whether a pregnancy has a higher or lower chance of certain chromosomal or genetic conditions.
If you are looking for prenatal screening in Chennai, you may have questions such as: Which screening tests are available? When should they be done? What does a high-risk result mean? And does a positive screening result mean that the baby has a condition?
Understanding the answers can help you discuss the right screening options with your obstetrician or fetal medicine specialist.
What Is Prenatal Screening?
Prenatal screening refers to tests performed during pregnancy to estimate the chance that a fetus may have certain genetic, chromosomal or structural conditions.
Screening may involve:
Ultrasound examinations
Maternal blood tests
Combined first-trimester screening
Cell-free DNA screening or NIPT
Detailed fetal structural assessment
The important point to remember is that screening is not the same as diagnosis.
A screening test can indicate that the chance of a particular condition is higher or lower, but it usually cannot confirm whether the baby has that condition.
When Does Prenatal Screening Start?
Prenatal screening can begin during the first trimester.
The exact timing depends on the type of test being considered. Your doctor may discuss screening options during your first prenatal appointments so that appropriate tests can be scheduled within their recommended time windows.
Early assessment can also help determine gestational age and identify whether further evaluation may be appropriate.
What Is First-Trimester Screening?
First-trimester screening may combine an ultrasound assessment with maternal blood testing to estimate the chance of certain chromosomal conditions.
The ultrasound component may include an NT scan (nuchal translucency scan), which measures the fluid at the back of the baby's neck.
Depending on the screening approach, maternal blood tests may assess specific biochemical markers.
The results are then interpreted together with factors such as gestational age and maternal characteristics to estimate the likelihood of certain conditions.
It is important to understand that an increased chance does not mean that the baby definitely has a chromosomal condition.
What Is NIPT?
NIPT (Non-Invasive Prenatal Testing), also known as cell-free DNA screening, analyses small fragments of placental DNA found in the mother's bloodstream.
It can screen for certain chromosomal conditions, including trisomy 21, trisomy 18 and trisomy 13.
NIPT is a screening test, not a diagnostic test. A high-risk result generally requires appropriate counselling and may be followed by diagnostic testing, depending on the clinical situation.
ACOG recommends that prenatal genetic screening and diagnostic testing options be discussed with all pregnant patients, regardless of age or baseline risk.
What Is the Anomaly Scan?
Prenatal screening is not limited to genetic or chromosomal conditions.
A detailed anomaly scan, sometimes called a fetal structural or Level II scan, examines the baby's anatomy during the second trimester.
The specialist may assess structures including:
Brain
Face
Spine
Heart
Abdomen
Kidneys
Limbs
Placenta
Amniotic fluid
The scan can identify certain structural abnormalities, although no ultrasound can detect every possible fetal condition.
The NHS recommends a mid-pregnancy ultrasound examination to check the baby's physical development and screen for certain structural conditions.
What Does a High-Risk Screening Result Mean?
A high-risk or positive screening result does not automatically mean that your baby has the condition being screened for.
This is one of the most important things parents should understand.
If your screening result indicates an increased chance, your doctor or fetal medicine specialist may recommend:
Reviewing the screening result in detail.
Performing or reviewing a detailed ultrasound.
Providing genetic or fetal counselling.
Discussing further screening where appropriate.
Considering diagnostic testing such as CVS or amniocentesis when indicated.
The next step depends on the specific screening result, gestational age, ultrasound findings and individual pregnancy circumstances.
What Happens After a Low-Risk Result?
A low-risk screening result is reassuring, but it does not guarantee that the baby has no health conditions.
Screening tests assess specific conditions and cannot identify every possible genetic, structural or developmental problem.
Routine antenatal care and recommended ultrasound examinations should therefore continue even after a low-risk screening result.
Is Prenatal Screening Necessary for Every Pregnancy?
The appropriate screening options should be discussed individually.
Many professional guidelines recommend that pregnant patients should be offered information about available screening and diagnostic options. The choice of test depends on factors such as pregnancy history, gestational age, personal preferences and clinical findings.
You do not necessarily need every available test.
A fetal medicine specialist can explain what each test can and cannot tell you so that you can make an informed decision.
How to Choose Prenatal Screening in Chennai?
If you are searching for prenatal screening in Chennai, consider a centre that offers more than laboratory testing.
Look for access to:
Experienced fetal medicine specialists
First-trimester ultrasound and NT assessment
Detailed anomaly scans
NIPT and other screening options
Genetic counselling
Prenatal diagnostic procedures when required
Clear interpretation of results
Appropriate follow-up
The quality of counselling is particularly important when a screening result indicates an increased chance of a fetal or chromosomal condition.
Conclusion
Prenatal screening can provide valuable information about your pregnancy and help identify whether further assessment may be appropriate.
The most important thing to remember is that a screening result is not a diagnosis. A high-risk result does not necessarily mean that the baby has a condition, while a low-risk result cannot rule out every possible problem.
If you are considering prenatal screening in Chennai, speak with an experienced obstetrician or fetal medicine specialist about the available tests, their timing, benefits and limitations.
Choosing the right test is less about doing every available screening test and more about understanding which option is appropriate for your individual pregnancy.
Doctor’s Note
“Prenatal screening is an important part of modern pregnancy care, but screening results need to be interpreted carefully. A high-risk screening result does not mean that the baby definitely has a genetic or chromosomal condition. When a result is concerning, we look at the complete clinical picture, including ultrasound findings and the type of screening performed, before discussing whether further testing is appropriate. Clear counselling helps parents understand their options and make informed decisions.”
— Dr. Divya Ravikumar, MBBS, DNB (OG), MRCOG, PDF (Fetal Medicine), Fetal Medicine Specialist
FAQs
1. What is prenatal screening during pregnancy?
Prenatal screening consists of tests that estimate the chance of certain genetic, chromosomal or structural conditions in the developing baby. It may involve ultrasound, maternal blood tests or cell-free DNA screening such as NIPT.
2. When should prenatal screening be done?
The timing depends on the type of screening. First-trimester screening is performed during early pregnancy, while detailed structural assessment is generally performed during the second trimester. Your doctor can recommend the appropriate timing for each test.
3. Does a high-risk prenatal screening result mean my baby has a problem?
No. A high-risk screening result means that the estimated chance is higher than a particular screening threshold. It does not confirm a diagnosis. Your doctor may recommend counselling, further ultrasound assessment or diagnostic testing depending on the circumstances.
4. Is NIPT a diagnostic test?
No. NIPT is a screening test that analyses cell-free DNA in the mother's blood to estimate the likelihood of certain chromosomal conditions. A high-risk NIPT result generally requires appropriate follow-up and, when indicated, diagnostic testing.
5. Where can I get prenatal screening in Chennai?
Look for a fetal medicine centre that provides specialist ultrasound assessment, prenatal screening, genetic counselling and access to diagnostic procedures when required. Experienced interpretation of the results is an important part of prenatal screening care.
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