Fish testing is usually done on the same samples as a karyotype - blood, amniocytes or a chorionic villi sample. A fish test is done using a fluorescent probe that binds to certain specific chromosomes.
No special preparation is needed for Down’S Syndrome Fish Blood. Inform your doctor if you are on any medications or have any underlying medical conditions or allergies before undergoing Down’S Syndrome Fish Blood. Your doctor depending on your condition will give specific instructions.