Constitutional Chromosomal Microarray (Copy Number)
| Abbrev Code: | COMP GH | ||
| Order Code: | LAB4737 | Order 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:
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. |
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| Associated Links: | |||
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) |
Interpretive
| 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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