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FISH for Trisomy 21

FISH for Trisomy 21

Fluorescence in situ Hybridization, more commonly referred to as the FISH test, is a groundbreaking genetic test. It is adept at detecting and mapping the genetic material found within an individual's cells. This test has found particular relevance in identifying specific characteristics in DNA, such as the presence of an extra chromosome, which is indicative of conditions like Trisomy 21.

Trisomy 21, more widely known as Down syndrome, is a genetic disorder caused by the presence of an extra 21st chromosome. This extra chromosome leads to changes in the development and features of an individual with Down syndrome, affecting their physical appearance and cognitive abilities.

In the FISH test, fluorescent probes bind to specific parts of the chromosome that have a high degree of sequence complementarity. This allows for the visualization of particular areas within the genome, which aids in detecting chromosomal abnormalities. Early detection of such conditions like Trisomy 21 is vital as it can significantly impact the management of the condition and the future quality of life for the individual and their family.


  • Test NameFISH for Trisomy 21
  • Sample TypeBlood
  • Preparations RequiredNo specific preparations are required for this test.
  • Report Time5 days

Why is the FISH test important for diagnosing Trisomy 21?

The FISH test is a vital tool in diagnosing Trisomy 21 as it allows for early and precise detection of the chromosomal abnormality. Early diagnosis means that appropriate measures can be taken to manage the condition and prepare for potential health complications.

Do I need to fast before this test?

No, there is no need to fast before taking the FISH test. Patients are encouraged to maintain their regular eating and drinking habits before undergoing the diagnostic procedure.

Home Sample Collection Process
1
Book your convenient slot
Book your convenient slot
2
Sample Collection by Phlebotomist
Sample Collection by Phlebotomist
3
Reporting of the sample at lab
Reporting of the sample at lab
4
Download Reports
Download Reports
Frequently Asked Questions

No specific preparations are required for this test. However, it is always beneficial to inform your healthcare provider about any medications or supplements you are currently taking as certain substances could potentially interfere with the results of the test.

The FISH test is typically performed during pregnancy if initial screening tests indicate a high risk of Trisomy 21. It may also be done after birth if the newborn exhibits symptoms associated with Down syndrome.

The FISH test can determine if there is an extra copy of chromosome 21 in the cells, indicating Trisomy 21. In addition, the test can help identify other chromosomal abnormalities.

The frequency of taking the FISH test generally depends on an individual's risk factors and the recommendations of the healthcare provider. For example, if you are pregnant and are at an increased risk due to factors such as advanced maternal age, family history, or abnormal initial screening results, your doctor may suggest this test.

Typically, individuals have two copies of each chromosome. The presence of a third copy of chromosome 21 in cells indicates Trisomy 21.

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

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

If the test results indicate an abnormality, it is important to consult with a genetic counselor or a medical geneticist. These professionals are trained to provide guidance and advice about the implications of genetic disorders, potential treatments, and management strategies.

The FISH test is highly accurate in detecting Trisomy 21. However, like all medical tests, there is a small chance of false-positive or false-negative results. Therefore, it's often used in conjunction with other diagnostic tests for confirmation.

The FISH test results provide crucial information that can guide the management of Trisomy 21. Early diagnosis allows for early intervention and treatment planning, which can significantly improve the quality of life for the individual and their family.

The FISH test is faster than most other chromosomal analysis tests and can give results within a few days. It is also highly specific as it uses fluorescent probes to target and visualize the specific chromosome of interest.

While the FISH test can accurately diagnose Trisomy 21, it cannot predict the severity of symptoms. The symptoms and their severity can vary widely among individuals with Trisomy 21, even those with the same chromosomal pattern.

Yes, the FISH test can be used as part of prenatal diagnostic testing if a screening test indicates a higher risk of Trisomy 21. However, it is important to discuss the benefits, risks, and limitations of this test with your healthcare provider.

In summary, the FISH test is an essential tool in diagnosing chromosomal abnormalities like Trisomy 21. Its accuracy, simplicity, and the absence of specific preparation requirements make it a beneficial tool for those at risk. Understanding these results should always involve consultation with healthcare professionals to ensure a comprehensive interpretation of the findings. Early detection through the FISH test can lead to more effective management strategies, thereby improving the quality of life for those affected by conditions like Trisomy 21.

FISH for Trisomy 21
₹ 3900
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