This is a diagnostic test and is used to determine birth defects such as Down’s syndrome and genetic diseases such as cystic fibrosis, sickle cell disease etc. But it cannot determine neural tube diseases defects (that amniocentesis which is a similar procedure can determine).
This is not a routine test and not all women need to take it. Doctors advise it in the following cases:
Between 10-12 weeks
The doctor uses the ultrasound as a guide and inserts a needle through your abdomen or inserts a catheter through your cervix in order to reach the placenta. Then the doctor takes a sample of cells from the placenta. These cells are tested in the lab for genetic problems (problems with chromosomes in the cells).
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