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Trisomy FISH Screen (13,18,21,X,Y) (Blood)

Test Information

Trisomy Screen FISH analysis is a cytogenetic test used to identify aneuplodies involving chromosomes 13, 18, 21, X, and Y.

Turnaround Time

4 days

CPT Code(s)

88230, 88275 x2, 88271 x4, 88291

Cost

$1,300

Disorders

Indications

The trisomy screen can be used as a rapid initial screen for some of the more common aneuploidies. FISH should be used in conjunction with G-banded chromosome analysis.

Methodology

FISH: Fluorescence in situ hybridization is a molecular cytogenetic technique in which fluorescently labeled DNA probes are hybridized to metaphase spreads or interphase nuclei.

Associated Tests

Specimen Requirements

Blood is the accepted specimen type for this test. 5-7 ml of whole blood in a green top (sodium heparin) tube is needed for this test. For newborns and small infants, 2-3 ml of blood in a sodium heparin, green top tube is acceptable.

Transport Instructions

Specimen should be kept at room temperature; do not freeze or refrigerate. Specimen should be sent by courier or overnight mail to arrive at the laboratory the next day.

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Have Questions? Need Support?

Call our laboratory at 1-800-473-9411 or contact one of our Laboratory Genetic Counselors for assistance.
Robin Fletcher, MS, CGC
Falecia Thomas, MS, CGC
Alex Finley, MS, CGC