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Laboratory Test Directory

Aneuploidy Screen by FISH, Neonatal


Name Method Department Units
Aneuploidy by FISH (Neonatal) Fluorescence in situ hybridization (FISH)

Specimen Requirements

Whole blood

Container Type Container Size Specimen Volume

Green tube (Sodium heparin), No Gel

3 mL 3 mL

Room temperature - 24 hour(s)

Specimen Preparation

  • Do not centrifuge
  • Do not freeze
  • Transport to laboratory as soon as possible
  • Keep at room temperature

Reasons for Rejection

  • Wrong collection tube
  • Frozen specimen
  • Centrifuged specimen
  • Clotted specimen
  • Serum sample


Completed Genetic Test Requisition Form required (available as downloadable PDF or call (614) 722-5321 to obtain a requisition form). Physician MUST call lab prior to sending specimen. Testing not performed on weekends; if weekend reporting is required, please call before sending a specimen to discuss weekend reporting option.

This test screens for numerical abnormalities of chromosomes 13,18, X, and Y. This test is performed only in conjunction with chromosome analysis. Note, this test does not screen for aneuploidy of chromosome 21 (e.g. Trisomy 21 or Down syndrome). Alternative to this test is STAT Chromosome Analysis which is performed on peripheral blood specimen, has the same result turn-around-time (2 days)?as this test, and can evaluate for numerical abnormalities for all chromosomes.

CPT Code

  • 88275
  • 88271 (x4)