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Laboratory Test Directory

Chromosome Analysis, Cord Blood


Name Method Department Units
Cord Blood, Chromosome Analysis Chromosomal analysis

Specimen Requirements

Whole blood

Container Type Container Size Specimen Volume

Green tube (Sodium heparin), No Gel

6 mL 3 mL-6 mL

Room temperature - 24 hour(s)

Specimen Preparation

  • Do not centrifuge
  • Do not freeze
  • Keep at room temperature

Reasons for Rejection

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


Please click on the Lab Form Link in the Forms Section to print and complete the Genetic Test Requisition Form. Submission of a completed Genetics Test Requisition Form is required. Please collect umbilical cord blood specimen in a Sodium Heparin tube (dark green-top tube without gel separator). Do not use Lithium Heparin tube or other types of Heparin tubes.

This test evaluates chromosomes in 20 cells (cultured lymphocytes) from cord blood. This test is used to diagnose or rule out numerial and structural chromosomal abnormalities such as aneuploidy, chromosome translocation, and chromosome inversion.

For newborn patients, STAT blood chromosome analysis is available at extra charge (see Test Code: STATPB), which provides a verbal preliminary result in 2 business days and faster written report turn-around-time. Please indicate "STAT" on the lab order if STAT analysis is desired.

If Microarray analysis is also desired, please submit additional cord blood sample (minimum 1 mL in EDTA). 

If evaluation of extra cells (beyond the routine 20 cells) is desired to rule out low-level mosaicism, please request "Mosaicism Study" on the lab order and 50 cells will be evaluated at extra charge (CPT code: 88263).

If patient has a family history of known chromosome abnormality, please provide the family member's chromosome result information (attach a copy of test result if available). If the proband was tested at Nationwide Children's Hospital Cytogenetics Laboratory, please provide the proband name, date of birth, and accession number (if available).

CPT Code

  • 88230
  • 88262
  • 88289