FISH Test for Williams Syndrome - Williams Syndrome Symptoms | Sprint Diagnostics

Patient Preparing : No specific preparation is necessary for this test.

₹ 7500


The Fluorescence in situ Hybridization (FISH) test is a revolutionary genetic test that can detect and map genetic material within an individual's cells. This test is crucial in pinpointing specific characteristics of DNA, such as the absence of a particular segment, characteristic of conditions like Williams Syndrome.

Williams Syndrome is a genetic disorder caused by a deletion of a segment on chromosome 7 (at the position 7q11.23) which includes the Elastin gene. This gene is important for the elasticity of blood vessels and other structures in the body. The absence of the Elastin gene leads to a range of symptoms including distinctive facial features, developmental delays, and cardiovascular issues.

In the FISH test, fluorescent probes bind to parts of the chromosome that demonstrate a high degree of sequence similarity. This allows visualization of specific regions in the genome, helping detect chromosomal abnormalities. Early detection of conditions like Williams Syndrome can significantly impact disease management and the affected individual's future quality of life.

Test Name FISH for Williams Syndrome (Elastin Gene 17q11.23)
Sample Type Blood
Preparations Required No specific preparation is necessary for this test.
Report Time 8 days
Price ₹ 7500

Why is the FISH test critical for diagnosing Williams Syndrome?

The FISH test is a valuable tool in diagnosing Williams Syndrome as it enables early and accurate detection of the chromosomal deletion. An early diagnosis allows healthcare providers to develop an appropriate management strategy and prepare for potential health complications.

Do I need to fast before this test?

No, there is no need to fast before the FISH test. Patients should maintain their usual eating and drinking habits prior to the test.

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Are there any specific preparations needed for this test?

No specific preparations are required for this test. However, informing your healthcare provider about any medications or supplements you are currently taking is recommended, as some substances might interfere with the test results.

When should this test be done?

The FISH test for Williams Syndrome is often recommended if an individual exhibits symptoms consistent with the condition, such as distinctive facial features, developmental delay, or cardiovascular issues. The test may also be performed prenatally if there is a family history of Williams Syndrome or other significant risk factors.

What information does the FISH test provide?

The FISH test can determine if there is a deletion in the region 7q11.23 on chromosome 7, which includes the Elastin gene. This deletion is indicative of Williams Syndrome.

How often should this test be done?

The frequency of this test is typically based on the individual's risk factors and the advice of their healthcare provider. If an individual exhibits symptoms consistent with Williams Syndrome, or if there is a family history of the condition, the test may be recommended.

What are considered normal values for this test?

Typically, individuals have two copies of each chromosome region, including the 7q11.23 region on chromosome 7. A single copy of this region suggests a deletion, indicating Williams Syndrome.

What precautions should I take before or after this test?

No specific precautions are necessary before or after the FISH test. However, it is important to follow your healthcare provider's instructions to ensure accurate results and promote overall wellbeing.

Are there any factors that can affect the results of this test?

Generally, the results of the FISH test are not influenced by external factors, as chromosomal abnormalities are genetic. However, certain technical aspects, such as the quality of the sample or errors during the laboratory process, could potentially affect the test results.

Which healthcare professional should I consult if the test results indicate an abnormality?

If the test results indicate an abnormality, it's crucial to consult a medical geneticist or a genetic counselor. These professionals are well-equipped to provide guidance and advice about the implications of genetic disorders, potential treatments, and management strategies.

How accurate is the FISH test for diagnosing Williams Syndrome?

The FISH test is highly accurate in detecting the deletion on chromosome 7 that leads to Williams Syndrome. However, like all tests, there is a small chance of false-positive or false-negative results. Therefore, additional tests may be used to confirm the diagnosis.

How will the results of this test influence the management of Williams Syndrome?

The results of the FISH test provide critical information that guides the management of Williams Syndrome. Early diagnosis allows for prompt intervention and planning of necessary treatments, which can significantly enhance the quality of life for the individual and their family.

What differentiates the FISH test from other genetic tests for Williams Syndrome?

The FISH test is faster and more specific than most other chromosomal analysis tests. It uses fluorescent probes to target and visualize the specific chromosome region of interest, offering results within a few days.

Can the FISH test predict the severity of symptoms in Williams Syndrome?

While the FISH test can accurately diagnose Williams Syndrome, it cannot predict the severity of symptoms. The symptoms and their severity can vary widely among individuals with Williams Syndrome, even those with the same chromosomal deletion.

Can the FISH test be used for prenatal screening for Williams Syndrome?

Yes, the FISH test can be used as part of prenatal diagnostic testing if there's a high risk of Williams Syndrome. However, the benefits, risks, and limitations of this test should be discussed with your healthcare provider.

In summary, the FISH test plays a crucial role in diagnosing chromosomal abnormalities like Williams Syndrome. Its accuracy and simplicity, coupled with the absence of specific preparation requirements, make it a valuable tool for those at risk. Always consult with healthcare professionals to ensure a comprehensive interpretation of the results. Early detection can pave the way for effective management strategies, thereby improving the quality of life for those affected by Williams Syndrome.

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