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Test Code CMACB Chromosomal Microarray, Congenital, Blood


Ordering Guidance


This test is not appropriate for detecting acquired copy number changes and excessive homozygosity. If this test is ordered with a reason for testing indicating a hematological disorder, the test will be canceled and CMAH / Chromosomal Microarray, Hematologic Disorders, Varies will be added and performed as the appropriate test.



Shipping Instructions


Advise Express Mail or equivalent if not on courier service.



Necessary Information


The reason for testing is required.



Specimen Required


This test requires 2 blood specimens: 1 sodium heparin and 1 EDTA.

Submit only 1 of the following specimen types:

 

Specimen Type: Whole blood

Container/Tube: Green top (sodium heparin) and lavender top (EDTA)

Specimen Volume: 3-mL EDTA tube and 4-mL sodium heparin tube

Collection Instructions:

1. Invert several times to mix blood.

2. Send whole blood specimens in original tubes. Do not aliquot.

 

Specimen Type: Cord blood

Container/Tube: Green top (sodium heparin) and lavender top (EDTA)

Specimen Volume: 3-mL EDTA tube and 4-mL sodium heparin tube

Note: The lab will attempt testing on a minimum of 1-mL whole blood, EDTA preferred.

Collection Instructions:

1. Invert several times to mix blood.

2. Send cord blood specimens in original tubes. Do not aliquot.

3. Label specimen as cord blood.


Forms

1. New York Clients-Informed consent is required. Document on the request form or electronic order that a copy is on file. The following documents are available:

-Informed Consent for Genetic Testing (T576)

-Informed Consent for Genetic Testing-Spanish (T826)

2. Chromosomal Microarray Patient Information (T665)

3. Family Member Phenotype Information for Genomic Testing

4. If not ordering electronically, complete, print, and send a Neurology Specialty Testing Client Test Request (T732) with the specimen.

Useful For

First-tier, postnatal testing for individuals with multiple anomalies that are not specific to well-delineated genetic syndromes, apparently nonsyndromic developmental delay or intellectual disability, or autism spectrum disorders as recommended by the American College of Medical Genetics and Genomics

 

Follow-up testing for individuals with unexplained developmental delay or intellectual disability, autism spectrum disorders, or congenital anomalies with a previously normal conventional chromosome study

 

Determining the size, precise breakpoints, gene content, and any unappreciated complexity of abnormalities detected by other methods such as conventional chromosome and fluorescence in situ hybridization studies

 

Determining if apparently balanced abnormalities identified by previous conventional chromosome studies have cryptic imbalances, since a proportion of such rearrangements that appear balanced at the resolution of a chromosome study are actually unbalanced when analyzed by higher-resolution chromosomal microarray

 

Assessing regions of homozygosity related to uniparental disomy or identity by descent

Method Name

Chromosomal Microarray (CMA)

Reporting Name

Chromosomal Microarray, Blood

Specimen Type

Whole blood

Specimen Minimum Volume

2 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Whole blood Ambient (preferred)
  Refrigerated 

Reject Due To

All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Reference Values

An interpretive report will be provided.

Day(s) Performed

Monday through Sunday

Report Available

7 to 14 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information

81229

LOINC Code Information

Test ID Test Order Name Order LOINC Value
CMACB Chromosomal Microarray, Blood 62343-9

 

Result ID Test Result Name Result LOINC Value
52399 Result Summary 50397-9
52400 Result 82939-0
54643 Nomenclature 62378-5
52401 Interpretation 69965-2
CG779 Reason For Referral 42349-1
54713 Specimen 31208-2
52402 Source 31208-2
52403 Method 85069-3
55128 Additional Information 48767-8
52404 Released By 18771-6