The FISH test (fluorescence in-situ hybridization) is performed on amniotic fluid for rapid detection of the most common fetal chromosome anomalies, including Trisomies 13, 18 and 21 (Down Syndrome) and aneusomies of the sex chromosomes, X and Y. It does not test for everything, just the "main ones" that the prenatal bloodtest looks for.
Amniocentesis (as opposed to the FISH test) can diagnose many genetic conditions prenatally, such as cystic fibrosis, fragile X syndrome, hemophilia, sickle cell disease, thalassemia and Tay-Sachs disease. Of course, amnio also diagnoses the same conditions that a FISH test will (ie: Trisomy 13, 18 and 21 "Down Syndrome") - it just takes longer to get the results.
We visit the specialist tomorrow morning and see the OB in the afternoon (maybe). We will get another look at the blood flow tomorrow morning and see what Dr. Chatelain recommends. Rachel is almost finished packing for the hospital - we will finish up tonight and be prepared for whatever happens tomorrow.
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