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FISH PROBE: WILLIAMS SYNDROME

Mnemonic

ATTN CYGEN

Synonym

Del 7q - FISH for 7q - Williams Syndrome - WS - Cytogenetics

Includes

A high resolution chromosome analysis will be performed in conjunction with the FISH analysis. FISH is not a stand-alone test.

Guidelines

FISH using fluorescently labeled DNA specific for ELN (elastin gene locus) is used to identify deletions within the 7q11.23 region.

Specimen Collection Requirements

Collect

Unclotted Whole Blood, dark green (preservative-free sodium heparin) top tube

Handling

Do not refrigerate, freeze or expose to extreme temperatures. Keep specimen at ambient temperature and transport within 24 hours. Maintain sterility, do not split the specimen or open the tube.

Preferred Volume

4.0 mL

Minimum Volume

1.0 mL

Transport

Room temperature within 24 hours of collection

Rejection Criteria

Capillary sticks

Stability

Ambient: 24 hours; Refrigerated: Suboptimal, call Cytogenetics at (503) 413-4613

Testing Information

Performed

Weekly

Reported

2-3 weeks, 4-7 days on the FISH portion of the test can be arranged by calling the Cytogenetics Lab at (503) 413-4613

Method

Fluorescent In Situ Hybridization (FISH)

Reference Values

Reference Values

Interpretation provided.

Comments

For questions regarding the report, please call (503) 413-4613.

Last Updated: Thursday, March 14, 2019 12:50:42 PM


Client Services: 503-413-1234