Subtelomeric Fluorescence In Situ Hybridization (FISH) Analysis

What Is Subtelomere FISH Used For?

Subtelomere FISH is primarily used in genetic testing to identify deletions or duplications in subtelomeric regions. These changes can be associated with conditions like developmental disorders, cancer predisposition, or other genetic syndromes. It’s often performed in research or specialized clinical settings for complex cases.

How Is the Test Performed?

A small amount of blood is drawn, and chromosomes are prepared from the sample. Fluorescent probes bind to specific subtelomeric sequences, allowing microscopic visualization of these regions. The test may also require specialized staining or imaging to detect abnormalities.

Who Might Need This Test?

This test may be recommended for individuals with unexplained developmental delays, intellectual disabilities, or multiple congenital anomalies. It could also be considered in cancer patients undergoing genetic evaluation or in families with a history of inherited genetic disorders.

What Are Common Findings?

Common findings include subtelomeric deletions or duplications, which may be detected as missing or extra fluorescent signals. These changes can vary in size and may not always correlate with a specific clinical condition, so interpretation requires expertise.