FISH Prenatal Testing Explained

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FISH, or Fluorescence In Situ Hybridization, is a diagnostic prenatal test which looks for a few common chromosomal abnormalities. A fluorescent dye is used to visualize and map genetic material in cells. FISH is usually performed with the same genetic material gathered for testing during CVS or amniocentesis. The advantage of FISH testing is that results are often available in as little as 24-48 hours. FISH has a low rate false positive results. If the fetal cells contain certain chromosomal abnormalities, this will be apparent with the FISH test. An exception might be if the parent has a chromosomal abnormality and the fetal cells were contaminated with parental […]