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DiGeorge/Velo-Cardio-Facial Syndrome deletion 22q11.2 by FISH*

Test Code

F VCF*

Test Synonyms

del(22)(q11.2), deletion 22q11.2

Associations

DiGeorge syndrome

Methodology

Fluorescence in situ Hybridization (FISH)
*Performed by affiliate laboratory

Turnaround Time

7-9 days

Specimen Requirements

5mL peripheral blood in sodium heparin
3mL bone marrow in sodium heparin
Fixed cytogenetically prepared cells in sterile centrifuge tube with pellet visible in 3:1, Methanol:Acetic Acid

Specimen Stability
Blood and bone marrow = 4°C to 25°C, specimens are stable up to 72 hours
Fixed cell pellets are stable for years when stored at -28°C to 15°C
Storage & Handling

4°C to 25°C during transit, but specimens may be transported on refrigerated gel packs. Do not allow the gel pack to come in contact with the specimen. Do not freeze. Extreme temperatures should be avoided.

Causes for Rejection

Clotted specimen; Specimen exposed to extreme temperature; Anticoagulant toxic to cells; Insufficient number of cells

Reference Range

See report

It is recommended that all FISH studies be done in conjunction with routine cytogenetic studies. If the FISH result is normal, a chromosome analysis allows identification of more complex abnormalities.

Description

DiGeorge syndrome is a rare congenital disease caused by a large deletion from chromosome 22, produced by an error in recombination at meiosis. This deletion indicates a loss of several genes from this region with the variation in symptoms relating to the amount of genetic material lost.

References
  1. Shprintzen RJ. et al. (2008). Velo-cardio-facial syndrome: 30 Years of study. Dev Disabil Res Rev.14(1):3-10.