The test having the fastest lab processing time for karyotype assessment is
Amniocentesis, cordocentesis, cystic hygroma aspiration, and chorionic villus sampling are techniques for obtaining fetal tissues that are amenable to cytogenetic analysis.Amniotic fluid cells require tissue culture to obtain adequate cell numbers for analysis.Chorionic villi can be harvested directly for extremely rapid diagnosis or can be cultured for higher banding (increased detail).
Amniocentesis
Cordocentesis
Chorionic villus sampling
Doppler flow ultrasound
All India exam