Constitutional Chromosomal Microarray (Copy Number)

Abbrev Code:COMP GH   
Order Code:LAB4737Order Name:Constitutional Chromosomal Microarray (Copy Number)
Synonyms:CGH; Microarray; Comparative Genomic Hybridization; CMA Chromosomal Microarray, Congenital, Constitutional
Methodology:Chromosomal microarray (CMA). Congenital.
CPT Codes: 81228 x1, 88230 x1, G0452 x1, x1
Turnaround Time:Results are reported within 7-21 days.
Special Instructions:Test request form requires:
  • Date and time of specimen collection
  • Specimen type
  • Patient information: date of birth, sex and medical record number
  • Ordering physician and contact number
  • Reason for referral
  • Clinical status
  • Information regarding medications or transfusions
  • Previous or pending genetic testing results

A signed informed consent in the patient's medical record is required. The consent should not be sent to the laboratory. The link to the Genetic Testing Consent Form is provided as a convenience for the providers and genetic counselors. See Associated Links.
Associated Links:

Genetic Testing Consent Form

Collection Instructions

Specimen:Whole blood
Alternative: Cord blood
BOTH a green (sodium heparin, no gel) tube AND a purple (EDTA) or yellow (ACD) tube must be collected.
Optimal Volume:5 mL in sodium heparin (green) AND 5 mL purple (EDTA) or yellow (ACD). Both tubes required for testing.
Minimum\Peds Volume:3 mL in green (sodium heparin, no gel) AND 3 mL purple (EDTA) or yellow (ACD). 1-3 mL for each tube will be accepted for patients with blood draw limitations. No heelsticks or fingersticks accepted.
Container:Green (sodium heparin, no gel) AND Purple (EDTA)
Alternate Containers: Yellow (ACD, Solution A) tube available from laboratory
Collection Instructions:Collect BOTH 3-5 mL in green (sodium heparin, no gel) AND 3-5 mL in purple (EDTA) tubes. Alternative to purple (EDTA), collect yellow (ACD).The yellow (ACD) is an alternate tube to the EDTA tube only.  Both tubes required for testing.
Causes for Rejection:Clotted or frozen sample. Incorrect specimen collection tube (anticoagulant).

Processing and Shipping

Specimen Processing:Do not process. Store at room temperature. Do not refrigerate or freeze.
Specimens must be received in the Cytogenetics Laboratory Mon-Fri by 5:30 pm; weekends and holidays by 4:30 pm. Specimens received after these cut offs will be processed the following day.
Shipping Instructions:Ship at room temperature.
Stability:For optimal testing results the specimen must arrive within 24 hours.
Test Performed at or Referral Lab Cytogenetics  (UMMC East Bank)


Limitations:Post-natal studies only.
Use:For detection of small duplications and deletions in patients with normal G-banded karyotypes. For characterization of abnormalities detected by G-banding.

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