Chromosome Analysis: Skin/Other Tissue

Condition Description

This test will detect abnormalities in chromosome number and large deletions/duplications of chromosome material as well as balanced chromosome rearrangements.  It can also detect mosaicism, which is often an indication for skin chromosome analysis.   

For most indications for cytogenetic testing (intellectual disability, developmental delays, autism spectrum disorders, multiple congenital anomalies, etc.) a chromosomal microarray has replaced the G-banded karyotype as the first-tier diagnostic test.  For more information about the benefits of the microarray, please click here. Additionally, skin samples often do not culture well.  The microarray does not use cultured cells whereas standard G-banded analysis requires cultured cells.

Genes (0)

Indications

Chromosome analysis performed on a tissue biopsy is warranted when mosaicism is suspected and not found in a peripheral blood sample.

Methodology

Chromosome analysis on non-cancerous solid tissue.

Detection

Chromosome analysis by ISCN and ACMG guidelines; minimum band resolution of 450.

Specimen Requirements

When sample fails to meet the acceptable criteria, please call 470.378.2200 and ask to speak with a laboratory genetic counselor (eglgc@egl-eurofins.com).
Submit only 1 of the following specimen types
Tissue Biopsy
TB

Requirements
Sterile Container
1-2 mm in length or > 100 mg is acceptable.
Flash freese sample upon collection using liquid nitrogen. If storage is required, store sample at -80°C or colder.
Collection and Shipping
Ship frozen sample on dry ice with overnight delivery. Not accepted on Saturday.
Skin Biopsy
SK

Requirements
Sterile container with EGL transport media or other sterile culture media (RPMI, Hanks Solution)
Obtain 1-2 cm pieces of tissue from a central location rather than a distal location to enhance cell viability and growth. Place in sterile container with EGL transport media or other sterile culture media. In the absence of media, place in a sterile container with a small amount of sterile saline. Use sterile dissection (no prep) for internal tissue.
Tissue fixed in formalin cannot be used.
Collection and Shipping
Ship sample at room temperature for receipt at EGL within 24 hours of collection. Do not refrigerate or freeze.
  • The EmArray 60K (VA) may detect microdeletions/duplications that are not visible on a peripheral blood chromosome analysis.
  • When mosiacism is suspected but not detected on a skin chromosome analysis, a chromosome analysis for mosaicism (MM) in peripheral blood may be warranted.
  • If there is a known chromosome abnormality in the family, such as a translocation, a targeted, family member chromosome study (FS) may be indicated.

How to Order

Requisition Forms