پاورپوینت غربالگری وتشخیص پیش ازتولد Screening, PND and molecular genetic methods

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پاورپوینت غربالگری وتشخیص پیش ازتولد Screening, PND and molecular genetic methods


  پاورپوینت غربالگری وتشخیص پیش ازتولد Screening, PND and molecular genetic methods   48اسلایدهمراه باتصویر به زبان انگلیسی Prenatal Screening •This can detect a disorder before a baby is born. •An ultrasound test is used to determine if the fetus is at a high or low risk from a genetic disorder. •Disorders are diagnosed by examining a small amount of fetal cells. This carries a small risk to the fetus. •If diagnosed early in the pregnancy, there is still the possibility of abortion.     First trimester maternal serum screening •free β- hCG , –hormone is produced by the placenta –increased in Down syndrome pregnancies. –Decreased in T18, T13 •PAPP-A , –pregnancy-associated plasma protein A, –produced by the fertilized egg –Decreased in T21, T18, T13 •nuchal translucency (NT) –fluid under the skin at the back of a baby’s neck at 10-14 weeks – …

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