• What is the difference between FISH and a standard Karyotype?

FISH is more specialized and accurate in detecting very small changes that might not be visible in a standard Karyotype.

• Are the results of this test definitive?

The test provides precise data for the target region, which should be discussed with a geneticist for comprehensive evaluation.

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Medical notice: this information is for education and service understanding. It is not a diagnosis or a recommendation for an unnecessary procedure.

About this service

A specialized genetic test using Fluorescence In Situ Hybridization (FISH) to examine the subtelomeric region of chromosome 21q. It evaluates micro-deletions or duplications and genomic variations in this specific region.

Importance of 21q Genetic Testing

Identifying subtle structural changes in chromosome 21q.
Assisting in the diagnosis of rare genetic syndromes.
Providing precise information for family genetic counseling.

Indications for Analysis

Presence of unexplained developmental delays or congenital anomalies.
Family history of chromosomal imbalances.
Complementing traditional Karyotype results.

How FISH Technology Works

Uses fluorescent probes that bind to specific gene sequences.
Allows visualization of genetic deletions or duplications under a microscope.
Highly accurate for detecting defects in targeted genomic regions.

What is included?

✓Blood sample collection
✓Laboratory analysis using FISH technique
✓Genetic results report

Conditions and notices

Fasting is not required
Provide previous genetic reports if available

Frequently Asked Questions

Short answers to the FAQs published with this service.

• What is the purpose of the FISH 21q test?

It aims to evaluate micro-structural variations like deletions or duplications at the end of chromosome 21.

• Is fasting required before the sample collection?

No, fasting is not required for this genetic test; it can be performed at any time of the day.

• How long does it take to get the genetic results?

Results usually take between 7 to 14 business days due to the specialized nature of the laboratory analysis.

• Can this test be performed at home?

Service resources and references

References and additional resources

Reference material and files associated with this service when available.

Scientific references

American Society of Human Genetics (ASHG)
Clinical Genetic Research Databases

Precise Genetic Analysis for 21q

About this service

Importance of 21q Genetic Testing

Indications for Analysis

How FISH Technology Works

What is included?

Conditions and notices

Frequently Asked Questions

References and additional resources

Scientific references

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