A doctor observed chromosomal disorder in the developing foetus and advise the couple to undergo abortion .suggest the technique by which the doctor observed the problem

The technique by which the doctor observed this is amniocentesis. Amniocentesis is fetal sex determination and disorder test based on the chromosomal pattern in the amniotic fluid surrounding the developing embryo. However it is being misused for sex determination and female fetus killing and so it has been legally banned for determining the sex of the fetus but can be used to detect chromosomal and genetic disorders