Karyotyping of the fetus can be done routinely through all of the following invasive method except:
There are three routine ways of obtaining fetal tissue for karyotyping: Chorionic villus sampling - done at First trimester(10-13th weeks) Amniocentesis - done at second trimester(16-18th weeks) Percutaneous umbilical blood sampling (cordocentesis) - done after 18 weeks.
Chorionic villus sampling
Cordocentesis
Amniocentesis
Fetal skin biopsy
Obstetrics