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Chromosomal Microarray Analysis (CMA) is a new genetic test that can detect disorders usually picked up by chromosome analysis (karyotype) and disorders that cannot be picked up on a karyotype (including many single gene disorders). It may be ordered for any patient with unexplained mental retardation or developmental delay, unusual physical characteristics, multiple congenital anomalies, or possible gene deletion or duplication.
CMA is usually done from a blood sample, although prenatal CMA is available by performing a CVS or amniocentesis. In some cases, blood from both parents may be requested to better interpret a child's results. Because the CMA is a relatively new and sensitive test, it is possible that a genetic abnormality for which little information is available will be detected.
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