How Accurate Is an Anomaly Scan in Spotting Birth Defects?

An anomaly scan can detect potential birth defects early. But how accurate is it?

An anomaly scan in Kolkata is a crucial test during pregnancy. It helps identify birth defects or congenital abnormalities. In this blog, we will explore what an anomaly scan detects, its accuracy, limitations, and the safety of the procedure.


What Is an Anomaly Scan?


An anomaly scan is a detailed ultrasound scan done during pregnancy. It checks the baby's development and detects any fetal anomaly. The scan is typically done between 18 and 22 weeks and looks for structural issues.


When Is the Anomaly Scan Done?


The ideal time for an anomaly scan during pregnancy is around 20 weeks. This is when most birth defects are visible. It’s also called a level 2 ultrasound and provides a detailed view of the baby.


H2: What Conditions Can an Anomaly Scan Detect?


An anomaly scan can identify various congenital abnormalities in pregnancy. These include:

Structural Birth Defects


It detects issues with the baby’s organs, bones, and body parts. Structural defects can include cleft lip, club foot, or abnormal facial features.

Neural Tube Defects


The scan can spot conditions like spina bifida or anencephaly. These conditions affect the spinal cord or brain.

Heart Abnormalities


It checks for defects in the baby’s heart, including VSD and TOF.

Skeletal and Limb Conditions


The scan can also reveal missing or underdeveloped limbs or bones.

Abdominal Wall Defects


It detects conditions like gastroschisis or omphalocele, where organs are outside the body.


Accuracy of Anomaly Scan in Detecting Birth Defects


The accuracy of an anomaly scan varies. It can detect most major birth defects, but not all. The accuracy rate for detecting birth defects is high, typically around 90-95% for certain conditions. However, small defects might be missed.


Limitations of the Anomaly Scan


While the scan is helpful, it doesn’t catch every issue. It is not a diagnostic test. The accuracy of the anomaly scan depends on several factors, including the baby’s position and the skill of the technician.


Factors That Affect Accuracy (Position, Gestation, Maternal Build)


Several factors can affect how well the scan works:


  • Baby’s Position: If the baby is in a difficult position, it can be harder to see everything.

  • Gestational Age: Scans are more accurate later in pregnancy, after 20 weeks.

  • Maternal Build: A larger maternal build may reduce the clarity of the scan.


What the Scan May Not Detect


An anomaly scan may miss subtle defects or those that are not visible at 20 weeks. It can also struggle with detecting conditions like chromosomal abnormalities (e.g., Down syndrome) without further testing.


Additional Tests After an Abnormal Result


If the scan shows abnormalities, further tests like amniocentesis or a detailed ultrasound scan pregnancy may be recommended. These tests can provide more detailed information.


Is the Anomaly Scan Safe for Mother and Baby?


Yes, the anomaly scan for birth defects is completely safe for both the mother and baby. It’s a non-invasive procedure and does not pose any known risks.


Preparing for Your Anomaly Scan


Preparing for the scan is simple. Drink water before the test to help get clear images. Follow any instructions from your doctor for the best results.

Consulting a Fetal Medicine Specialist


If you have concerns after your anomaly scan results, it’s best to consult a fetal medicine specialist for further guidance and testing.

Detect Your Baby's Risks


An anomaly scan baby health check-up, is essential for detecting birth defects early. While not 100% accurate, it provides critical insights into your baby’s well-being.

Reach out to Fetomat Wellness


If you're looking for a trusted anomaly scan in Kolkata, visit Fetomat Wellness. Our expert team provides thorough fetal anomaly scan pregnancy screenings, and personalised care.

FAQs on Anomaly Scan and Birth Defects


  1. When is the best time for an anomaly scan?


The best time is between 18 and 22 weeks of pregnancy.


  1. Can an anomaly scan detect all birth defects?


No, it cannot detect all defects, especially smaller ones or chromosomal abnormalities.


  1. What is the accuracy of the anomaly scan?


The accuracy is around 90-95% for detecting major birth defects.


  1. Is the anomaly scan safe for the baby?


Yes, the scan is completely safe for both the mother and baby.


  1. What happens if the anomaly scan results are abnormal?


Further tests like amniocentesis or a detailed ultrasound scan may be recommended.

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