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FISH for Chromosome 18

Omics test Model
Test Code FCB005
Test Summary Fluorescence in situ hybridization (FISH) is performed for aneuploidy detection of chromosome 18
Turn Around Time 3 days
Acceptable Sample Types Cord Blood
NY Approved No
Accreditations CAP , ISO 15189 (NABL)
*TAT starts after the sample and all required sample information is received, or after the benefits investigation is complete if requested for commercial insurance billing.

**The CPT codes listed are in accordance with Current Procedural Terminology, a publication of the American Medical Association, and are provided for informational purposes only. CPT coding is the sole responsibility of the billing party.

This testing service has not been cleared or approved by the U.S. Food and Drug Administration. Testing services may not be licensed in accordance with the laws in all countries. The availability of specific test offerings is dependent upon laboratory location.
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Test Description

FISH - Rapid detection of aneuploidy involving chromosome 18. Assay offered in conjunction with chromosome study.

Indications for Testing

FISH - The FISH analysis does not detect structural chromosome abnormalities, mosaicism, and other numerical chromosome abnormalities (excluding 13, 18, and 21). The American College of Medical Genetics recommends that irreversible therapeutic action should not be initiated on the basis of FISH results alone.

Condition Description


  • Screening result suggests aneuploidy
  • Advanced maternal age
  • One major or at least two minor fetal structural defects found on ultrasound
  • Previous fetus or child with aneuploidy
  • Parent of this pregnancy has a structural chromosome abnormality (e.g.,translocation, inversion) involving chromosome 18

Test Methods and Limitations

FISH - Fluorescence in situ hybridization (FISH) Fluorescence Microscopy

Detailed Sample Requirements

Cord Blood
Test Details Page
Collection Container(s) EDTA (Purple Top) or ACD (Yellow Top)
Collection Collect 1 to 3 mL of fetal blood.
Sample Condition Store at ambient temperature. Do not refrigerate or freeze.
Shipping Ship overnight at ambient temperature ensuring receipt within 5 days of collection.